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Case Reports
. 2014 Sep;51(9):605-13.
doi: 10.1136/jmedgenet-2014-102535. Epub 2014 Jul 25.

Neurodevelopmental disorders associated with dosage imbalance of ZBTB20 correlate with the morbidity spectrum of ZBTB20 candidate target genes

Malene B Rasmussen  1 , Jakob V Nielsen  2 , Charles M Lourenço  3 , Joana B Melo  4 , Christina Halgren  1 , Camila V L Geraldi  3 , Wilson Marques Jr  3 , Guilherme R Rodrigues  3 , Mads Thomassen  5 , Mads Bak  1 , Claus Hansen  1 , Susana I Ferreira  6 , Margarida Venâncio  7 , Karen F Henriksen  1 , Allan Lind-Thomsen  1 , Isabel M Carreira  4 , Niels A Jensen  2 , Niels Tommerup  1
Affiliations
Case Reports

Neurodevelopmental disorders associated with dosage imbalance of ZBTB20 correlate with the morbidity spectrum of ZBTB20 candidate target genes

Malene B Rasmussen et al. J Med Genet. 2014 Sep.

Abstract

Background: Recently, a number of patients have been described with structural rearrangements at 3q13.31, delineating a novel microdeletion syndrome with common clinical features including developmental delay and other neurodevelopmental disorders (NDD). A smallest region of overlapping deletions (SRO) involved five RefSeq genes, including the transcription factor gene ZBTB20 and the dopamine receptor gene DRD3, considered as candidate genes for the syndrome.

Methods and results: We used array comparative genomic hybridization and next-generation mate-pair sequencing to identify key structural rearrangements involving ZBTB20 in two patients with NDD. In a patient with developmental delay, attention-deficit hyperactivity disorder, psychosis, Tourette's syndrome and autistic traits, a de novo balanced t(3;18) translocation truncated ZBTB20. The other breakpoint did not disrupt any gene. In a second patient with developmental delay and autism, we detected the first microdeletion at 3q13.31, which truncated ZBTB20 but did not involve DRD3 or the other genes within the previously defined SRO. Zbtb20 directly represses 346 genes in the developing murine brain. Of the 342 human orthologous ZBTB20 candidate target genes, we found 68 associated with NDD. Using chromatin immunoprecipitation and quantitative PCR, we validated the in vivo binding of Zbtb20 in evolutionary conserved regions in six of these genes (Cntn4, Gad1, Nrxn1, Nrxn3, Scn2a, Snap25).

Conclusions: Our study links dosage imbalance of ZBTB20 to a range of neurodevelopmental, cognitive and psychiatric disorders, likely mediated by dysregulation of multiple ZBTB20 target genes, and provides new knowledge on the genetic background of the NDD seen in the 3q13.31 microdeletion syndrome.

Keywords: Cell biology; Chromosomal; Cytogenetics; Genetics; Psychiatry.

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