Entry - *603961 - SEMAPHORIN 3A; SEMA3A - OMIM
 
* 603961

SEMAPHORIN 3A; SEMA3A


Alternative titles; symbols

SEMAPHORIN III
SEMAPHORIN D; SEMAD
COLLAPSIN 1; COLL1


HGNC Approved Gene Symbol: SEMA3A

Cytogenetic location: 7q21.11   Genomic coordinates (GRCh38) : 7:83,955,777-84,492,725 (from NCBI)


Gene-Phenotype Relationships
Location Phenotype Phenotype
MIM number
Inheritance Phenotype
mapping key
7q21.11 {Hypogonadotropic hypogonadism 16 with or without anosmia} 614897 AD 3

TEXT

Mapping

Gross (2020) mapped the SEMA3A gene to chromosome 7q21.11 based on an alignment of the SEMA3A sequence (GenBank AK289954) with the genomic sequence (GRCh38).


Gene Function

Takahashi et al. (1999) found that the 2 semaphorin-binding proteins, plexin-1 (PLXN1; 601055) and neuropilin-1 (NP1, or NRP1; 602069), form a stable complex. PLXN1 alone did not bind semaphorin-3A (SEMA3A), but the NRP1/PLXN1 complex had a higher affinity for SEMA3A than did NRP1 alone. While SEMA3A binding to NRP1 did not alter nonneuronal cell morphology, SEMA3A interaction with NRP1/PLXN1 complexes induced adherent cells to round up. Expression of a dominant-negative PLXN1 in sensory neurons blocked SEMA3A-induced growth cone collapse. SEMA3A treatment led to the redistribution of growth cone NRP1 and PLXN1 into clusters. Thus, the authors concluded that physiologic SEMA3A receptors consist of NRP1/PLXN1 complexes.

Polleux et al. (2000) demonstrated that the growth of apical dendrites toward the pial surface is regulated by a diffusible chemoattractant present at high levels near the marginal zone. A major component of the signal is SEMA3A, which was previously characterized as a chemorepellent for cortical axons. Soluble guanylate cyclase is asymmetrically localized to the developing apical dendrite, and is required for the chemoattractive effect of SEMA3A. Thus, the asymmetric localization of soluble guanylate cyclase confers distinct SEMA3A responses to axons and dendrites. Polleux et al. (2000) concluded that these observations reveal a mechanism by which a single chemotropic signal can pattern both axons and dendrites during development.

Most striatal and cortical interneurons arise from the basal telencephalon, later segregating to their respective targets. Marin et al. (2001) demonstrated that migrating cortical interneurons avoid entering the striatum because of a chemorepulsive signal composed at least in part of semaphorin-3A and semaphorin-3F (601124). Migrating interneurons expressing neuropilins, receptors for semaphorins, are directed to the cortex; those lacking them go to the striatum. Loss of neuropilin function increases the number of interneurons that migrate into the striatum. Marin et al. (2001) concluded that their observations reveal a mechanism by which neuropilins mediate sorting of distinct neuronal populations into different brain structures, and provide evidence that, in addition to guiding axons, these receptors also control neuronal migration in the central nervous system.

Using a COS cell-based morphologic assay, Takahashi and Strittmatter (2001) showed that Plexa1 or Plexa2 activity mediated Sema3 signaling in combination with neuropilins, resulting in cell contraction, growth cone collapse, and neurite outgrowth inhibition. Truncation analysis revealed that the intracellular domain of Plexa1 mediated signaling activity and that the transmembrane region was required for this activity. The conserved sema domain in the Plexa1 extracellular segment bound to the remainder of the PlexA1 extracellular region, inhibited Plexa1 activity, and prevented Plexa1 from participating in Sema3a signaling. Furthermore, the Plexa1 sema domain and the remainder of the Plexa1 extracellular domain interacted with Nrp1 at sites distinct from the Sema3a binding site of Nrp1 and enhanced Sema3a binding to Nrp1. Sema3a binding to Nrp1 induced a conformational change in the Nrp1/Plexa1 complex nd dissociated the sema domain from the remainder of the Plexa1 ectodomain, thereby activating Plexa1 and causing cell contraction.

Serini et al. (2003) demonstrated that during vascular development and experimental angiogenesis, endothelial cells generate autocrine chemorepulsive signals of class 3 semaphorins (SEMA3 proteins) that localize at nascent adhesive sites in spreading endothelial cells. Disrupting endogenous SEMA3 function in endothelial cells stimulated integrin-mediated adhesion and migration to extracellular matrices, whereas exogenous SEMA3 proteins antagonized integrin activation. Misexpression of dominant-negative SEMA3 receptors in chick embryo endothelial cells locked integrins in an active conformation, and severely impaired vascular remodeling. Sema3a-null mice showed vascular defects as well. Serini et al. (2003) concluded that during angiogenesis, endothelial SEMA3 proteins endow the vascular system with the plasticity required for reshaping by controlling integrin function. Note that an Expression of Concern was published for the article by Serini et al. (2003).

Wu et al. (2005) showed that transcripts for RhoA (165390), a small GTPase that regulates the actin cytoskeleton, are localized in developing axons and growth cones, and that this localization is mediated by an axonal targeting element located in the RhoA 3-prime untranslated region. Sema3A induces intraaxonal translation of RhoA mRNA, and this local translation of RhoA is necessary and sufficient for Sema3A-mediated growth cone collapse. Wu et al. (2005) concluded that their studies indicate that local RhoA translation regulates the neuronal cytoskeleton and identify a new mechanism for the regulation of RhoA signaling.

Using immunohistochemistry, Lepelletier et al. (2007) found that NP1 and SEMA3A were expressed in thymic epithelial cells (TECs) and CD4 (186940)/CD8 (see 186910) thymocytes. Both IL7 (146660), which is constitutively secreted by TECs, and T-cell receptor (TCR) engagement upregulated NP1 expression in thymocytes. SEMA3A blocked adhesion of NP1-positive thymocytes to TECs and induced thymocyte repulsive migration, partially by inhibiting binding of very late antigens (see ITGA4; 192975) to laminin (see LAMA1; 150320). Lepelletier et al. (2007) concluded that NP1 and SEMA3A interactions are important in regulation of migration and adhesion of thymocytes.

Imai et al. (2009) analyzed the pre-target axon sorting for olfactory map formation in mice. In olfactory sensory neurons, an axon guidance receptor, neuropilin-1 (NPN1; 602069), and its repulsive ligand, semaphorin-3A, are expressed in a complementary manner. Imai et al. (2009) found that expression levels of neuropilin-1 determined both pre-target sorting and projection sites of axons. Olfactory sensory neuron-specific knockout of semaphorin-3A perturbed axon sorting and altered the olfactory map topography. Thus, Imai et al. (2009) concluded that pre-target axon sorting plays an important role in establishing the topographic order based on the relative levels of guidance molecules expressed by axons.

Tran et al. (2009) found that a Sema3A-Npn1/PlexA4 (604280) signaling cascade controls basal dendritic arborization in layer V cortical neurons, but does not influence spine morphogenesis or distribution. In contrast, they demonstrated that the secreted semaphorin Sema3F (601124) is a negative regulator of spine development and synaptic structure. Mice with null mutations in genes encoding Sema3F and its holoreceptor components neuropilin-2 (NPN2; 602070) and plexin A3 (PLEXA3; 300022) exhibit increased dentate gyrus granule cell and cortical layer V pyramidal neuron spine number and size, and also aberrant spine distribution. Moreover, Sema3F promotes loss of spines and excitatory synapses in dissociated neurons in vitro, and in Npn2-null brain slices cortical layer V and dentate gyrus granule cells exhibit increased miniature excitatory postsynaptic current frequency. These disparate effects of secreted semaphorins are reflected in the restricted dendritic localization of Npn2 to apical dendrites and of Npn1 to all dendrites of cortical pyramidal neurons.

Hayashi et al. (2012) showed that Sema3a exerts an osteoprotective effect by both suppressing osteoclastic bone resorption and increasing osteoblastic bone formation. The binding of Sema3A to neuropilin-1 (Nrp1) inhibited RANKL (602642)-induced osteoclast differentiation by inhibiting ITAM (608740) and RhoA signaling pathways. In addition, Sema3A and Nrp1 binding stimulated osteoblast and inhibited adipocyte differentiation through the canonical Wnt/beta-catenin signaling pathway (see 116806). The osteopenic phenotype in Sema3a-null mice was recapitulated by mice in which the Sema3A-binding site of Nrp1 had been genetically disrupted. Intravenous Sema3A administration in mice increased bone volume and expedited bone regeneration.

In mice, Fukuda et al. (2013) showed that Sema3A is abundantly expressed in bone, and cell-based assays showed that Sema3A affected osteoblast differentiation in a cell-autonomous fashion. Accordingly, Sema3A-null mice had a low bone mass due to decreased bone formation. Fukuda et al. (2013) created osteoblast-specific Sema3A-null mice using Col1a1 (120150)-Cre mice and osterix (606633)-Cre mice (Sema3a(col1)-null and Sema3a(osx)-null mice, respectively), and neuron-specific Sema3A-null mice using synapsin-1 (313440)-Cre mice and nestin (600915)-Cre mice (Sema3a(synapsin)-null and Sema3a(nestin)-null mice, respectively). The osteoblast-specific Sema3A-deficient mice had normal bone mass even though the expression of Sema3A in bone was substantially decreased. In contrast, mice lacking Sema3A in neurons had low bone mass similar to Sema3a-null mice, indicating that neuron-derived Sema3A is responsible for the observed bone abnormalities independent of the local effect of Sema3A in bone. Indeed, the number of sensory innervations of trabecular bone was significantly decreased in Sema3a(synapsin)-null mice, whereas sympathetic innervations of trabecular bone were unchanged. Moreover, ablating sensory nerves decreased bone mass in wildtype mice, whereas it did not reduce the low bone mass in Sema3a(nestin)-null mice further, supporting the essential role of the sensory nervous system in normal bone homeostasis. Finally, neuronal abnormalities in Sema3a-null mice, such as olfactory development, were identified in Sema3a(synapsin)-null mice, demonstrating that neuron-derived Sema3A contributes to the abnormal neural development seen in Sema3a-null mice, and indicating that Sema3A produced in neurons regulates neural development in an autocrine manner. Fukuda et al. (2013) concluded that Sema3A regulates bone remodeling indirectly by modulating sensory nerve development, but not directly by acting on osteoblasts.

Molofsky et al. (2014) showed that postnatal spinal cord astrocytes express several region-specific genes, and that ventral astrocyte-encoded SEMA3A is required for proper motor neuron and sensory neuron circuit organization. Loss of astrocyte-encoded Sema3a leads to dysregulated alpha-motor neuron axon initial segment orientation, markedly abnormal synaptic inputs, and selective death of alpha-motor but not of adjacent gamma-motor neurons. In addition, a subset of Trka (191315)-positive sensory afferents projects to ectopic ventral positions. Molofsky et al. (2014) concluded that these findings demonstrated that stable maintenance of a positional cue by developing astrocytes influences multiple aspects of sensorimotor circuit formation. More generally, they suggested that regional astrocyte heterogeneity may help to coordinate postnatal neural circuit refinement.

Uesaka et al. (2014) identified semaphorins, a family of versatile cell recognition molecules, as retrograde signals for elimination of redundant climbing fiber to Purkinje cell synapses in developing mouse cerebellum. Knockdown of Sema3a, a secreted semaphorin, in Purkinje cells or its receptor in climbing fibers accelerated synapse elimination during postnatal day 8 (P8) to P18. Conversely, knockdown of Sema7a (607961), a membrane-anchored semaphorin, in Purkinje cells or either of its 2 receptors in climbing fibers impaired synapse elimination after P15. The effect of Sema7a involves signaling by metabotropic glutamate receptor-1 (GRM1; 604473), a canonical pathway for climbing fiber synapse elimination. Uesaka et al. (2014) concluded that their findings defined how semaphorins retrogradely regulate multiple processes of synapse elimination.

Lee et al. (2017) showed that bitter and sweet taste receptor cells provide instructive signals to bitter and sweet target neurons via different guidance molecules, SEMA3A and SEMA7A, respectively. Lee et al. (2017) demonstrated that targeted expression of SEMA3A or SEMA7A in different classes of taste receptor cells produces peripheral taste systems with miswired sweet or bitter cells. They engineered mice with bitter neurons that responded to sweet tastants, sweet neurons that responded to bitter, or sweet neurons that responded to sour stimuli. Lee et al. (2017) concluded that their results uncovered the basic logic of the wiring of the taste system at the periphery, and illustrated how a labeled-line sensory circuit preserves signaling integrity despite rapid and stochastic turnover of receptor cells.


Molecular Genetics

Hypogonadotropic Hypogonadism 16 with or without Anosmia

In 2 sibs and their father with Kallmann syndrome (HH16; 614897), Young et al. (2012) identified heterozygosity for a 213-kb deletion in the SEMA3A gene (603961.0001). Sequencing of the nondeleted SEMA3A allele and of 12 known HH-associated genes in affected members of the family did not reveal any other mutations. Young et al. (2012) concluded that SEMA3A plays a role in anosmic hypogonadotropic hypogonadism.

Because mutant mice lacking a functional Sema3a-binding domain in the NRP1 gene have a Kallmann syndrome (KS)-like phenotype (anosmic HH), Hanchate et al. (2012) sequenced the SEMA3A gene in 386 unrelated patients with anosmic HH, 88 (23%) of whom were known to carry a heterozygous mutation in 1 of 5 previously tested KS-associated genes (KAL1, 300836; FGFR1, 136350; PROKR2, 607123; PROK2, 607002; and FGF8, 600483). Heterozygosity for 8 different nonsynonymous mutations in SEMA3A were identified in 24 patients (see, e.g., 603961.0002 and 603961.0003), including 5 patients already known to carry a mutation in another KS-associated gene (KAL1; FGFR1; PROKR2; and PROK2). The 7 missense mutations in the SEMA3A gene were all located at highly conserved residues and 6 were shown to be loss-of-function mutations; all 7 had been reported in the Exome Variant Server database, and 3 were also detected in the sample of 386 controls. Based on the seemingly normal reproductive phenotype of Sema3a +/- mice, Hanchate et al. (2012) suggested that monoallelic mutations in SEMA3A are not sufficient to induce the abnormal phenotype in patients, but contribute to the pathogenesis of KS through synergistic effects with mutant alleles of other disease-associated genes.

In 2 Chinese patients with HH without anosmia (patients 1 and 2), Dai et al. (2020) identified heterozygous missense mutations in the SEMA3A gene (R197Q, 603961.0004 and R617Q, 603961.0006, respectively). In a Chinese patient with anosmic HH (patient 2), they identified a heterozygous V458I mutation in the SEMA3A gene (603961.0005). Transfection of a plasmid containing SEMA3A with the R197Q or R617Q mutation showed normal secretion but absence of FAK phosphorylation in GN11 cells and failure to stimulate GN11 cell migration; transfection with the V458I mutation showed abnormal secretion, failure to phosphorylate FAK in GN11 cells, and failure to stimulate GN11 cell migration. Patient 2 also had heterozygous mutations in the CCDC141 (616031) and PROKR2 (607123) genes, leading Dai et al. (2020) to consider oligogenic inheritance in this patient.

Associations Pending Confirmation

For discussion of an association between variation in the SEMA3A gene and crypt frequency in the iris, see 610744.


Animal Model

Behar et al. (1996) generated mice mutant in semaphorin III using embryonic stem cells in which they replaced the first coding exon with 'neo' cassettes. Heterozygous mice appeared normal. The cerebral cortex of homozygous mutant mice showed a paucity of neuropil and abnormally oriented neuronal processes, especially of the large pyramidal neurons. Certain embryonic bones and cartilaginous structures developed abnormally, with vertebral fusions and partial rib duplications. The few mice that survived more than a few days postnatally manifested pronounced and selective hypertrophy of the right ventricle of the heart and dilation of the right atrium. Behar et al. (1996) thus concluded that semaphorin III may serve as a signal that restrains growth in several developing organs.

Kaneko et al. (2006) found that adult rats with transection of the spinal cord showed considerable functional recovery after being treated with a Sema3A inhibitor, SM-216289, derived from the fermentation broth of a fungal strain. With SM-216289 treatment, the injured rats showed substantially enhanced regeneration and/or preservation of injured axons, robust Schwann cell-mediated myelination and axonal regeneration in the lesion site, decreased number of apoptotic cells, and marked enhancement of angiogenesis compared to untreated rats. Kaneko et al. (2006) concluded that Sema3A is an inhibitor of axonal regeneration and other regenerative responses after spinal cord injury.

Using immunofluorescence microscopy, Ieda et al. (2007) analyzed the distribution of sympathetic nerves in mouse heart. Sema3a was abundantly expressed in the trabecular layer in early-stage embryos, but it was restricted to Purkinje fibers after birth. Sema3a -/- mice lacked a cardiac sympathetic innervation gradient and exhibited stellate ganglia malformation, leading to marked sinus bradycardia due to sympathetic dysfunction. Overexpression of Sema3a in hearts of transgenic mice led to reduced sympathetic innervation and attenuation of the epicardial-to-endocardial innervation gradient. Sema3a-overexpressing mice succumbed to sudden death and showed susceptibility to ventricular tachycardia due to catecholamine supersensitivity and prolongation of action potential duration. Ieda et al. (2007) concluded that normal sympathetic innervation mediated by SEMA3A is important for maintenance of arrhythmia-free hearts.


ALLELIC VARIANTS ( 6 Selected Examples):

.0001 HYPOGONADOTROPIC HYPOGONADISM 16 WITH ANOSMIA, SUSCEPTIBILITY TO

SEMA3A, 213-KB DEL
   RCV000032920

In a brother and sister and their father with Kallmann syndrome (HH16; 614897), Young et al. (2012) identified heterozygosity for a 213-kb deletion involving exon 6 through exon 17 of the SEMA3A gene. No mutation was found on the nondeleted allele, and no mutations were found in other known HH-associated genes. Young et al. (2012) concluded that loss of function of SEMA3A played a role in the patients' phenotype. Hanchate et al. (2012) stated that their findings did not support mere autosomal dominant mendelian inheritance in this family, and suggested that variation in another gene combined with SEMA3A haploinsufficiency produced the disease phenotype.


.0002 HYPOGONADOTROPIC HYPOGONADISM 16 WITH ANOSMIA, SUSCEPTIBILITY TO

SEMA3A, VAL435ILE
  
RCV000032921...

In 16 patients with anosmic hypogonadotropic hypogonadism (HH16; 614897), Hanchate et al. (2012) identified heterozygosity for a G-A transition in exon 11 of the SEMA3A gene, resulting in a val435-to-ile (V435I) substitution at a highly conserved residue in the SEMA domain. Transfection studies in COS-7 cells demonstrated defective secretion of the mutant protein, which was not detected in the conditioned medium. The V435I mutation had been reported in the Exome Variant Server database with an allele frequency in the European American population of 1.3%, and was also detected in 13 of 772 control chromosomes. Three of the patients with V435I were known to also carry heterozygous mutations in 3 other HH-associated genes, including a man with a missense mutation in FGFR1 (136350), a man with a missense mutation in PROKR2 (607123), and a woman with a frameshift mutation in PROK2 (607002). Hanchate et al. (2012) suggested that monoallelic mutations in SEMA3A contribute to the pathogenesis of anosmic HH through synergistic effects with other mutant alleles of disease-associated genes.


.0003 HYPOGONADOTROPIC HYPOGONADISM 16 WITH ANOSMIA, SUSCEPTIBILITY TO

SEMA3A, 14-BP DEL, NT1613
   RCV000032922

In a man with anosmic hypogonadotropic hypogonadism (HH16; 614897), Hanchate et al. (2012) identified heterozygosity for a 14-bp deletion (1613_1626del) in exon 14 of the SEMA3A gene, predicted to cause a frameshift within the PSI domain resulting in a premature termination codon (Asp538fsTer31). Transfection studies in COS-7 cells demonstrated defective secretion of the mutant protein, which was not detected in the conditioned medium. The mutation was not found in the Exome Variant Server database or in 386 unrelated Caucasian controls.


.0004 HYPOGONADOTROPIC HYPOGONADISM 16 WITHOUT ANOSMIA, SUSCEPTIBILITY TO

SEMA3A, ARG197GLN
  
RCV001785416

In a man with hypogonadotropic hypogonadism without anosmia (HH16; 614897), Dai et al. (2020) identified a heterozygous c.590G-A transition in the SEMA3A gene, resulting in an arg197-to-gln (R197Q) substitution at a conserved residue in the sema domain. The mutation was identified by whole-exome sequencing and confirmed by Sanger sequencing. The patient's mother was heterozygous for the mutation. The mutation was not present in the gnomAD database or in a database of 2,019 Chinese controls. Transfection of a plasmid containing SEMA3A with the R197Q mutation showed that normal secretion but failure to phosphorylate FAK in GN11 cells and failure to stimulate GN11 cell migration.


.0005 HYPOGONADOTROPIC HYPOGONADISM 16 WITH ANOSMIA, SUSCEPTIBILITY TO

SEMA3A, VAL458ILE
  
RCV001785417...

In a man with anosmic hypogonadotropic hypogonadism (HH16; 614897), Dai et al. (2020) identified a heterozygous c.1372G-A transition in the SEMA3A gene, resulting in a val458-to-ile (V458I) substitution at a conserved residue in the sema domain. The mutation was identified by whole-exome sequencing and confirmed by Sanger sequencing. The patient's father, who had normal fertility, was heterozygous for the mutation. The mutation was present in the gnomAD database at a frequency of 0.000053 and was not identified in a database of 2,019 Chinese controls. Transfection of a plasmid containing SEMA3A with the V458I mutation showed abnormal secretion, failure to phosphorylate FAK in GN11 cells, and failure to stimulate GN11 cell migration.


.0006 HYPOGONADOTROPIC HYPOGONADISM 16 WITHOUT ANOSMIA, SUSCEPTIBILITY TO

SEMA3A, ARG617GLN
  
RCV001785418

In a man with hypogonadotropic hypogonadism without anosmia (HH16; 614897), Dai et al. (2020) identified a heterozygous c.1850G-A transition in the SEMA3A gene, resulting in an arg617-to-gln (R617Q) substitution at a conserved residue in the Ig domain. The mutation was identified by whole-exome sequencing and confirmed by Sanger sequencing. The patient's mother was heterozygous for the mutation. The mutation was present in the gnomAD database at a frequency of 0.0000041 and was not identified in a database of 2,019 Chinese controls. Transfection of a plasmid containing SEMA3A with the R617Q mutation showed normal secretion but failure to phosphorylate FAK in GN11 cells and failure to stimulate GN11 cell migration. The patient also had heterozygous mutations in the CCDC141 (616031) and PROKR2 (607123), leading Dai et al. (2020) to consider oligogenic inheritance.


REFERENCES

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Hilary J. Vernon - updated : 11/22/2021
Matthew B. Gross - updated : 01/14/2020
Bao Lige - updated : 01/06/2020
Ada Hamosh - updated : 01/29/2018
Ada Hamosh - updated : 07/09/2014
Ada Hamosh - updated : 5/30/2014
Ada Hamosh - updated : 7/10/2013
Marla J. F. O'Neill - updated : 10/23/2012
Ada Hamosh - updated : 9/20/2012
Marla J. F. O'Neill - updated : 9/12/2011
Ada Hamosh - updated : 4/15/2010
Ada Hamosh - updated : 9/1/2009
Paul J. Converse - updated : 6/12/2007
Paul J. Converse - updated : 5/16/2007
Cassandra L. Kniffin - updated : 1/4/2007
Ada Hamosh - updated : 9/15/2005
Ada Hamosh - updated : 8/5/2003
Patricia A. Hartz - updated : 7/15/2003
Ada Hamosh - updated : 8/27/2001
Ada Hamosh - updated : 4/5/2000
Stylianos E. Antonarakis - updated : 10/25/1999
Creation Date:
Patti M. Sherman : 7/1/1999
carol : 04/16/2024
carol : 04/15/2024
carol : 11/22/2021
carol : 04/07/2020
mgross : 01/14/2020
mgross : 01/06/2020
alopez : 01/29/2018
carol : 10/27/2017
alopez : 07/09/2014
alopez : 5/30/2014
alopez : 10/28/2013
alopez : 10/2/2013
alopez : 7/10/2013
carol : 10/23/2012
terry : 10/23/2012
alopez : 9/24/2012
terry : 9/20/2012
carol : 9/13/2011
terry : 9/12/2011
alopez : 4/15/2010
terry : 9/1/2009
mgross : 6/12/2007
mgross : 5/16/2007
mgross : 5/16/2007
wwang : 1/25/2007
ckniffin : 1/4/2007
alopez : 9/16/2005
terry : 9/15/2005
carol : 8/28/2003
alopez : 8/6/2003
terry : 8/5/2003
mgross : 7/15/2003
alopez : 8/31/2001
terry : 8/27/2001
alopez : 4/5/2000
terry : 4/5/2000
mgross : 10/25/1999
psherman : 7/1/1999

* 603961

SEMAPHORIN 3A; SEMA3A


Alternative titles; symbols

SEMAPHORIN III
SEMAPHORIN D; SEMAD
COLLAPSIN 1; COLL1


HGNC Approved Gene Symbol: SEMA3A

Cytogenetic location: 7q21.11   Genomic coordinates (GRCh38) : 7:83,955,777-84,492,725 (from NCBI)


Gene-Phenotype Relationships

Location Phenotype Phenotype
MIM number
Inheritance Phenotype
mapping key
7q21.11 {Hypogonadotropic hypogonadism 16 with or without anosmia} 614897 Autosomal dominant 3

TEXT

Mapping

Gross (2020) mapped the SEMA3A gene to chromosome 7q21.11 based on an alignment of the SEMA3A sequence (GenBank AK289954) with the genomic sequence (GRCh38).


Gene Function

Takahashi et al. (1999) found that the 2 semaphorin-binding proteins, plexin-1 (PLXN1; 601055) and neuropilin-1 (NP1, or NRP1; 602069), form a stable complex. PLXN1 alone did not bind semaphorin-3A (SEMA3A), but the NRP1/PLXN1 complex had a higher affinity for SEMA3A than did NRP1 alone. While SEMA3A binding to NRP1 did not alter nonneuronal cell morphology, SEMA3A interaction with NRP1/PLXN1 complexes induced adherent cells to round up. Expression of a dominant-negative PLXN1 in sensory neurons blocked SEMA3A-induced growth cone collapse. SEMA3A treatment led to the redistribution of growth cone NRP1 and PLXN1 into clusters. Thus, the authors concluded that physiologic SEMA3A receptors consist of NRP1/PLXN1 complexes.

Polleux et al. (2000) demonstrated that the growth of apical dendrites toward the pial surface is regulated by a diffusible chemoattractant present at high levels near the marginal zone. A major component of the signal is SEMA3A, which was previously characterized as a chemorepellent for cortical axons. Soluble guanylate cyclase is asymmetrically localized to the developing apical dendrite, and is required for the chemoattractive effect of SEMA3A. Thus, the asymmetric localization of soluble guanylate cyclase confers distinct SEMA3A responses to axons and dendrites. Polleux et al. (2000) concluded that these observations reveal a mechanism by which a single chemotropic signal can pattern both axons and dendrites during development.

Most striatal and cortical interneurons arise from the basal telencephalon, later segregating to their respective targets. Marin et al. (2001) demonstrated that migrating cortical interneurons avoid entering the striatum because of a chemorepulsive signal composed at least in part of semaphorin-3A and semaphorin-3F (601124). Migrating interneurons expressing neuropilins, receptors for semaphorins, are directed to the cortex; those lacking them go to the striatum. Loss of neuropilin function increases the number of interneurons that migrate into the striatum. Marin et al. (2001) concluded that their observations reveal a mechanism by which neuropilins mediate sorting of distinct neuronal populations into different brain structures, and provide evidence that, in addition to guiding axons, these receptors also control neuronal migration in the central nervous system.

Using a COS cell-based morphologic assay, Takahashi and Strittmatter (2001) showed that Plexa1 or Plexa2 activity mediated Sema3 signaling in combination with neuropilins, resulting in cell contraction, growth cone collapse, and neurite outgrowth inhibition. Truncation analysis revealed that the intracellular domain of Plexa1 mediated signaling activity and that the transmembrane region was required for this activity. The conserved sema domain in the Plexa1 extracellular segment bound to the remainder of the PlexA1 extracellular region, inhibited Plexa1 activity, and prevented Plexa1 from participating in Sema3a signaling. Furthermore, the Plexa1 sema domain and the remainder of the Plexa1 extracellular domain interacted with Nrp1 at sites distinct from the Sema3a binding site of Nrp1 and enhanced Sema3a binding to Nrp1. Sema3a binding to Nrp1 induced a conformational change in the Nrp1/Plexa1 complex nd dissociated the sema domain from the remainder of the Plexa1 ectodomain, thereby activating Plexa1 and causing cell contraction.

Serini et al. (2003) demonstrated that during vascular development and experimental angiogenesis, endothelial cells generate autocrine chemorepulsive signals of class 3 semaphorins (SEMA3 proteins) that localize at nascent adhesive sites in spreading endothelial cells. Disrupting endogenous SEMA3 function in endothelial cells stimulated integrin-mediated adhesion and migration to extracellular matrices, whereas exogenous SEMA3 proteins antagonized integrin activation. Misexpression of dominant-negative SEMA3 receptors in chick embryo endothelial cells locked integrins in an active conformation, and severely impaired vascular remodeling. Sema3a-null mice showed vascular defects as well. Serini et al. (2003) concluded that during angiogenesis, endothelial SEMA3 proteins endow the vascular system with the plasticity required for reshaping by controlling integrin function. Note that an Expression of Concern was published for the article by Serini et al. (2003).

Wu et al. (2005) showed that transcripts for RhoA (165390), a small GTPase that regulates the actin cytoskeleton, are localized in developing axons and growth cones, and that this localization is mediated by an axonal targeting element located in the RhoA 3-prime untranslated region. Sema3A induces intraaxonal translation of RhoA mRNA, and this local translation of RhoA is necessary and sufficient for Sema3A-mediated growth cone collapse. Wu et al. (2005) concluded that their studies indicate that local RhoA translation regulates the neuronal cytoskeleton and identify a new mechanism for the regulation of RhoA signaling.

Using immunohistochemistry, Lepelletier et al. (2007) found that NP1 and SEMA3A were expressed in thymic epithelial cells (TECs) and CD4 (186940)/CD8 (see 186910) thymocytes. Both IL7 (146660), which is constitutively secreted by TECs, and T-cell receptor (TCR) engagement upregulated NP1 expression in thymocytes. SEMA3A blocked adhesion of NP1-positive thymocytes to TECs and induced thymocyte repulsive migration, partially by inhibiting binding of very late antigens (see ITGA4; 192975) to laminin (see LAMA1; 150320). Lepelletier et al. (2007) concluded that NP1 and SEMA3A interactions are important in regulation of migration and adhesion of thymocytes.

Imai et al. (2009) analyzed the pre-target axon sorting for olfactory map formation in mice. In olfactory sensory neurons, an axon guidance receptor, neuropilin-1 (NPN1; 602069), and its repulsive ligand, semaphorin-3A, are expressed in a complementary manner. Imai et al. (2009) found that expression levels of neuropilin-1 determined both pre-target sorting and projection sites of axons. Olfactory sensory neuron-specific knockout of semaphorin-3A perturbed axon sorting and altered the olfactory map topography. Thus, Imai et al. (2009) concluded that pre-target axon sorting plays an important role in establishing the topographic order based on the relative levels of guidance molecules expressed by axons.

Tran et al. (2009) found that a Sema3A-Npn1/PlexA4 (604280) signaling cascade controls basal dendritic arborization in layer V cortical neurons, but does not influence spine morphogenesis or distribution. In contrast, they demonstrated that the secreted semaphorin Sema3F (601124) is a negative regulator of spine development and synaptic structure. Mice with null mutations in genes encoding Sema3F and its holoreceptor components neuropilin-2 (NPN2; 602070) and plexin A3 (PLEXA3; 300022) exhibit increased dentate gyrus granule cell and cortical layer V pyramidal neuron spine number and size, and also aberrant spine distribution. Moreover, Sema3F promotes loss of spines and excitatory synapses in dissociated neurons in vitro, and in Npn2-null brain slices cortical layer V and dentate gyrus granule cells exhibit increased miniature excitatory postsynaptic current frequency. These disparate effects of secreted semaphorins are reflected in the restricted dendritic localization of Npn2 to apical dendrites and of Npn1 to all dendrites of cortical pyramidal neurons.

Hayashi et al. (2012) showed that Sema3a exerts an osteoprotective effect by both suppressing osteoclastic bone resorption and increasing osteoblastic bone formation. The binding of Sema3A to neuropilin-1 (Nrp1) inhibited RANKL (602642)-induced osteoclast differentiation by inhibiting ITAM (608740) and RhoA signaling pathways. In addition, Sema3A and Nrp1 binding stimulated osteoblast and inhibited adipocyte differentiation through the canonical Wnt/beta-catenin signaling pathway (see 116806). The osteopenic phenotype in Sema3a-null mice was recapitulated by mice in which the Sema3A-binding site of Nrp1 had been genetically disrupted. Intravenous Sema3A administration in mice increased bone volume and expedited bone regeneration.

In mice, Fukuda et al. (2013) showed that Sema3A is abundantly expressed in bone, and cell-based assays showed that Sema3A affected osteoblast differentiation in a cell-autonomous fashion. Accordingly, Sema3A-null mice had a low bone mass due to decreased bone formation. Fukuda et al. (2013) created osteoblast-specific Sema3A-null mice using Col1a1 (120150)-Cre mice and osterix (606633)-Cre mice (Sema3a(col1)-null and Sema3a(osx)-null mice, respectively), and neuron-specific Sema3A-null mice using synapsin-1 (313440)-Cre mice and nestin (600915)-Cre mice (Sema3a(synapsin)-null and Sema3a(nestin)-null mice, respectively). The osteoblast-specific Sema3A-deficient mice had normal bone mass even though the expression of Sema3A in bone was substantially decreased. In contrast, mice lacking Sema3A in neurons had low bone mass similar to Sema3a-null mice, indicating that neuron-derived Sema3A is responsible for the observed bone abnormalities independent of the local effect of Sema3A in bone. Indeed, the number of sensory innervations of trabecular bone was significantly decreased in Sema3a(synapsin)-null mice, whereas sympathetic innervations of trabecular bone were unchanged. Moreover, ablating sensory nerves decreased bone mass in wildtype mice, whereas it did not reduce the low bone mass in Sema3a(nestin)-null mice further, supporting the essential role of the sensory nervous system in normal bone homeostasis. Finally, neuronal abnormalities in Sema3a-null mice, such as olfactory development, were identified in Sema3a(synapsin)-null mice, demonstrating that neuron-derived Sema3A contributes to the abnormal neural development seen in Sema3a-null mice, and indicating that Sema3A produced in neurons regulates neural development in an autocrine manner. Fukuda et al. (2013) concluded that Sema3A regulates bone remodeling indirectly by modulating sensory nerve development, but not directly by acting on osteoblasts.

Molofsky et al. (2014) showed that postnatal spinal cord astrocytes express several region-specific genes, and that ventral astrocyte-encoded SEMA3A is required for proper motor neuron and sensory neuron circuit organization. Loss of astrocyte-encoded Sema3a leads to dysregulated alpha-motor neuron axon initial segment orientation, markedly abnormal synaptic inputs, and selective death of alpha-motor but not of adjacent gamma-motor neurons. In addition, a subset of Trka (191315)-positive sensory afferents projects to ectopic ventral positions. Molofsky et al. (2014) concluded that these findings demonstrated that stable maintenance of a positional cue by developing astrocytes influences multiple aspects of sensorimotor circuit formation. More generally, they suggested that regional astrocyte heterogeneity may help to coordinate postnatal neural circuit refinement.

Uesaka et al. (2014) identified semaphorins, a family of versatile cell recognition molecules, as retrograde signals for elimination of redundant climbing fiber to Purkinje cell synapses in developing mouse cerebellum. Knockdown of Sema3a, a secreted semaphorin, in Purkinje cells or its receptor in climbing fibers accelerated synapse elimination during postnatal day 8 (P8) to P18. Conversely, knockdown of Sema7a (607961), a membrane-anchored semaphorin, in Purkinje cells or either of its 2 receptors in climbing fibers impaired synapse elimination after P15. The effect of Sema7a involves signaling by metabotropic glutamate receptor-1 (GRM1; 604473), a canonical pathway for climbing fiber synapse elimination. Uesaka et al. (2014) concluded that their findings defined how semaphorins retrogradely regulate multiple processes of synapse elimination.

Lee et al. (2017) showed that bitter and sweet taste receptor cells provide instructive signals to bitter and sweet target neurons via different guidance molecules, SEMA3A and SEMA7A, respectively. Lee et al. (2017) demonstrated that targeted expression of SEMA3A or SEMA7A in different classes of taste receptor cells produces peripheral taste systems with miswired sweet or bitter cells. They engineered mice with bitter neurons that responded to sweet tastants, sweet neurons that responded to bitter, or sweet neurons that responded to sour stimuli. Lee et al. (2017) concluded that their results uncovered the basic logic of the wiring of the taste system at the periphery, and illustrated how a labeled-line sensory circuit preserves signaling integrity despite rapid and stochastic turnover of receptor cells.


Molecular Genetics

Hypogonadotropic Hypogonadism 16 with or without Anosmia

In 2 sibs and their father with Kallmann syndrome (HH16; 614897), Young et al. (2012) identified heterozygosity for a 213-kb deletion in the SEMA3A gene (603961.0001). Sequencing of the nondeleted SEMA3A allele and of 12 known HH-associated genes in affected members of the family did not reveal any other mutations. Young et al. (2012) concluded that SEMA3A plays a role in anosmic hypogonadotropic hypogonadism.

Because mutant mice lacking a functional Sema3a-binding domain in the NRP1 gene have a Kallmann syndrome (KS)-like phenotype (anosmic HH), Hanchate et al. (2012) sequenced the SEMA3A gene in 386 unrelated patients with anosmic HH, 88 (23%) of whom were known to carry a heterozygous mutation in 1 of 5 previously tested KS-associated genes (KAL1, 300836; FGFR1, 136350; PROKR2, 607123; PROK2, 607002; and FGF8, 600483). Heterozygosity for 8 different nonsynonymous mutations in SEMA3A were identified in 24 patients (see, e.g., 603961.0002 and 603961.0003), including 5 patients already known to carry a mutation in another KS-associated gene (KAL1; FGFR1; PROKR2; and PROK2). The 7 missense mutations in the SEMA3A gene were all located at highly conserved residues and 6 were shown to be loss-of-function mutations; all 7 had been reported in the Exome Variant Server database, and 3 were also detected in the sample of 386 controls. Based on the seemingly normal reproductive phenotype of Sema3a +/- mice, Hanchate et al. (2012) suggested that monoallelic mutations in SEMA3A are not sufficient to induce the abnormal phenotype in patients, but contribute to the pathogenesis of KS through synergistic effects with mutant alleles of other disease-associated genes.

In 2 Chinese patients with HH without anosmia (patients 1 and 2), Dai et al. (2020) identified heterozygous missense mutations in the SEMA3A gene (R197Q, 603961.0004 and R617Q, 603961.0006, respectively). In a Chinese patient with anosmic HH (patient 2), they identified a heterozygous V458I mutation in the SEMA3A gene (603961.0005). Transfection of a plasmid containing SEMA3A with the R197Q or R617Q mutation showed normal secretion but absence of FAK phosphorylation in GN11 cells and failure to stimulate GN11 cell migration; transfection with the V458I mutation showed abnormal secretion, failure to phosphorylate FAK in GN11 cells, and failure to stimulate GN11 cell migration. Patient 2 also had heterozygous mutations in the CCDC141 (616031) and PROKR2 (607123) genes, leading Dai et al. (2020) to consider oligogenic inheritance in this patient.

Associations Pending Confirmation

For discussion of an association between variation in the SEMA3A gene and crypt frequency in the iris, see 610744.


Animal Model

Behar et al. (1996) generated mice mutant in semaphorin III using embryonic stem cells in which they replaced the first coding exon with 'neo' cassettes. Heterozygous mice appeared normal. The cerebral cortex of homozygous mutant mice showed a paucity of neuropil and abnormally oriented neuronal processes, especially of the large pyramidal neurons. Certain embryonic bones and cartilaginous structures developed abnormally, with vertebral fusions and partial rib duplications. The few mice that survived more than a few days postnatally manifested pronounced and selective hypertrophy of the right ventricle of the heart and dilation of the right atrium. Behar et al. (1996) thus concluded that semaphorin III may serve as a signal that restrains growth in several developing organs.

Kaneko et al. (2006) found that adult rats with transection of the spinal cord showed considerable functional recovery after being treated with a Sema3A inhibitor, SM-216289, derived from the fermentation broth of a fungal strain. With SM-216289 treatment, the injured rats showed substantially enhanced regeneration and/or preservation of injured axons, robust Schwann cell-mediated myelination and axonal regeneration in the lesion site, decreased number of apoptotic cells, and marked enhancement of angiogenesis compared to untreated rats. Kaneko et al. (2006) concluded that Sema3A is an inhibitor of axonal regeneration and other regenerative responses after spinal cord injury.

Using immunofluorescence microscopy, Ieda et al. (2007) analyzed the distribution of sympathetic nerves in mouse heart. Sema3a was abundantly expressed in the trabecular layer in early-stage embryos, but it was restricted to Purkinje fibers after birth. Sema3a -/- mice lacked a cardiac sympathetic innervation gradient and exhibited stellate ganglia malformation, leading to marked sinus bradycardia due to sympathetic dysfunction. Overexpression of Sema3a in hearts of transgenic mice led to reduced sympathetic innervation and attenuation of the epicardial-to-endocardial innervation gradient. Sema3a-overexpressing mice succumbed to sudden death and showed susceptibility to ventricular tachycardia due to catecholamine supersensitivity and prolongation of action potential duration. Ieda et al. (2007) concluded that normal sympathetic innervation mediated by SEMA3A is important for maintenance of arrhythmia-free hearts.


ALLELIC VARIANTS 6 Selected Examples):

.0001   HYPOGONADOTROPIC HYPOGONADISM 16 WITH ANOSMIA, SUSCEPTIBILITY TO

SEMA3A, 213-KB DEL
ClinVar: RCV000032920

In a brother and sister and their father with Kallmann syndrome (HH16; 614897), Young et al. (2012) identified heterozygosity for a 213-kb deletion involving exon 6 through exon 17 of the SEMA3A gene. No mutation was found on the nondeleted allele, and no mutations were found in other known HH-associated genes. Young et al. (2012) concluded that loss of function of SEMA3A played a role in the patients' phenotype. Hanchate et al. (2012) stated that their findings did not support mere autosomal dominant mendelian inheritance in this family, and suggested that variation in another gene combined with SEMA3A haploinsufficiency produced the disease phenotype.


.0002   HYPOGONADOTROPIC HYPOGONADISM 16 WITH ANOSMIA, SUSCEPTIBILITY TO

SEMA3A, VAL435ILE
SNP: rs147436181, gnomAD: rs147436181, ClinVar: RCV000032921, RCV000059788, RCV000455242

In 16 patients with anosmic hypogonadotropic hypogonadism (HH16; 614897), Hanchate et al. (2012) identified heterozygosity for a G-A transition in exon 11 of the SEMA3A gene, resulting in a val435-to-ile (V435I) substitution at a highly conserved residue in the SEMA domain. Transfection studies in COS-7 cells demonstrated defective secretion of the mutant protein, which was not detected in the conditioned medium. The V435I mutation had been reported in the Exome Variant Server database with an allele frequency in the European American population of 1.3%, and was also detected in 13 of 772 control chromosomes. Three of the patients with V435I were known to also carry heterozygous mutations in 3 other HH-associated genes, including a man with a missense mutation in FGFR1 (136350), a man with a missense mutation in PROKR2 (607123), and a woman with a frameshift mutation in PROK2 (607002). Hanchate et al. (2012) suggested that monoallelic mutations in SEMA3A contribute to the pathogenesis of anosmic HH through synergistic effects with other mutant alleles of disease-associated genes.


.0003   HYPOGONADOTROPIC HYPOGONADISM 16 WITH ANOSMIA, SUSCEPTIBILITY TO

SEMA3A, 14-BP DEL, NT1613
ClinVar: RCV000032922

In a man with anosmic hypogonadotropic hypogonadism (HH16; 614897), Hanchate et al. (2012) identified heterozygosity for a 14-bp deletion (1613_1626del) in exon 14 of the SEMA3A gene, predicted to cause a frameshift within the PSI domain resulting in a premature termination codon (Asp538fsTer31). Transfection studies in COS-7 cells demonstrated defective secretion of the mutant protein, which was not detected in the conditioned medium. The mutation was not found in the Exome Variant Server database or in 386 unrelated Caucasian controls.


.0004   HYPOGONADOTROPIC HYPOGONADISM 16 WITHOUT ANOSMIA, SUSCEPTIBILITY TO

SEMA3A, ARG197GLN
SNP: rs1404070020, ClinVar: RCV001785416

In a man with hypogonadotropic hypogonadism without anosmia (HH16; 614897), Dai et al. (2020) identified a heterozygous c.590G-A transition in the SEMA3A gene, resulting in an arg197-to-gln (R197Q) substitution at a conserved residue in the sema domain. The mutation was identified by whole-exome sequencing and confirmed by Sanger sequencing. The patient's mother was heterozygous for the mutation. The mutation was not present in the gnomAD database or in a database of 2,019 Chinese controls. Transfection of a plasmid containing SEMA3A with the R197Q mutation showed that normal secretion but failure to phosphorylate FAK in GN11 cells and failure to stimulate GN11 cell migration.


.0005   HYPOGONADOTROPIC HYPOGONADISM 16 WITH ANOSMIA, SUSCEPTIBILITY TO

SEMA3A, VAL458ILE
SNP: rs553661856, gnomAD: rs553661856, ClinVar: RCV001785417, RCV004591567, RCV004749740

In a man with anosmic hypogonadotropic hypogonadism (HH16; 614897), Dai et al. (2020) identified a heterozygous c.1372G-A transition in the SEMA3A gene, resulting in a val458-to-ile (V458I) substitution at a conserved residue in the sema domain. The mutation was identified by whole-exome sequencing and confirmed by Sanger sequencing. The patient's father, who had normal fertility, was heterozygous for the mutation. The mutation was present in the gnomAD database at a frequency of 0.000053 and was not identified in a database of 2,019 Chinese controls. Transfection of a plasmid containing SEMA3A with the V458I mutation showed abnormal secretion, failure to phosphorylate FAK in GN11 cells, and failure to stimulate GN11 cell migration.


.0006   HYPOGONADOTROPIC HYPOGONADISM 16 WITHOUT ANOSMIA, SUSCEPTIBILITY TO

SEMA3A, ARG617GLN
SNP: rs919402688, gnomAD: rs919402688, ClinVar: RCV001785418

In a man with hypogonadotropic hypogonadism without anosmia (HH16; 614897), Dai et al. (2020) identified a heterozygous c.1850G-A transition in the SEMA3A gene, resulting in an arg617-to-gln (R617Q) substitution at a conserved residue in the Ig domain. The mutation was identified by whole-exome sequencing and confirmed by Sanger sequencing. The patient's mother was heterozygous for the mutation. The mutation was present in the gnomAD database at a frequency of 0.0000041 and was not identified in a database of 2,019 Chinese controls. Transfection of a plasmid containing SEMA3A with the R617Q mutation showed normal secretion but failure to phosphorylate FAK in GN11 cells and failure to stimulate GN11 cell migration. The patient also had heterozygous mutations in the CCDC141 (616031) and PROKR2 (607123), leading Dai et al. (2020) to consider oligogenic inheritance.


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Contributors:
Hilary J. Vernon - updated : 11/22/2021
Matthew B. Gross - updated : 01/14/2020
Bao Lige - updated : 01/06/2020
Ada Hamosh - updated : 01/29/2018
Ada Hamosh - updated : 07/09/2014
Ada Hamosh - updated : 5/30/2014
Ada Hamosh - updated : 7/10/2013
Marla J. F. O'Neill - updated : 10/23/2012
Ada Hamosh - updated : 9/20/2012
Marla J. F. O'Neill - updated : 9/12/2011
Ada Hamosh - updated : 4/15/2010
Ada Hamosh - updated : 9/1/2009
Paul J. Converse - updated : 6/12/2007
Paul J. Converse - updated : 5/16/2007
Cassandra L. Kniffin - updated : 1/4/2007
Ada Hamosh - updated : 9/15/2005
Ada Hamosh - updated : 8/5/2003
Patricia A. Hartz - updated : 7/15/2003
Ada Hamosh - updated : 8/27/2001
Ada Hamosh - updated : 4/5/2000
Stylianos E. Antonarakis - updated : 10/25/1999

Creation Date:
Patti M. Sherman : 7/1/1999

Edit History:
carol : 04/16/2024
carol : 04/15/2024
carol : 11/22/2021
carol : 04/07/2020
mgross : 01/14/2020
mgross : 01/06/2020
alopez : 01/29/2018
carol : 10/27/2017
alopez : 07/09/2014
alopez : 5/30/2014
alopez : 10/28/2013
alopez : 10/2/2013
alopez : 7/10/2013
carol : 10/23/2012
terry : 10/23/2012
alopez : 9/24/2012
terry : 9/20/2012
carol : 9/13/2011
terry : 9/12/2011
alopez : 4/15/2010
terry : 9/1/2009
mgross : 6/12/2007
mgross : 5/16/2007
mgross : 5/16/2007
wwang : 1/25/2007
ckniffin : 1/4/2007
alopez : 9/16/2005
terry : 9/15/2005
carol : 8/28/2003
alopez : 8/6/2003
terry : 8/5/2003
mgross : 7/15/2003
alopez : 8/31/2001
terry : 8/27/2001
alopez : 4/5/2000
terry : 4/5/2000
mgross : 10/25/1999
psherman : 7/1/1999