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. 2009 Jan;9(1):1-26.
doi: 10.1016/j.gep.2008.09.004. Epub 2008 Sep 21.

Expression pattern of LRR and Ig domain-containing protein (LRRIG protein) in the early mouse embryo

Shunsaku Homma  1 , Takako Shimada, Tsuyoshi Hikake, Hiroyuki Yaginuma
Affiliations

Expression pattern of LRR and Ig domain-containing protein (LRRIG protein) in the early mouse embryo

Shunsaku Homma et al. Gene Expr Patterns. 2009 Jan.

Abstract

The combination of leucine-rich repeat (LRR) and immunoglobulin-like (Ig) domains is found in the domain architecture of the Trk neurotrophin receptor protein. Recently dozens of such proteins simultaneously carrying LRR and Ig domains as the Trk receptors have been identified. Given the significant biological roles of Trk and such newly identified proteins, we have searched the public database for human proteins with LRR and Ig domains (collectively termed the leucine-rich repeat and Ig domain-containing protein, LRRIG protein, in this study), and have analyzed the mRNA expression pattern of mouse orthologs of obtained human LRRIG proteins at embryonic day 10. The list of the LRRIG proteins includes 36 human proteins: four LINGO, three NGL, five SALM, three NLRR, three Pal, two ISLR, three LRIG, two GPR, two Adlican, two Peroxidasin-like proteins, three Trk neurotrophin receptors, a yet unnamed protein AAI11068, and three AMIGO. Some molecules (LINGO2, LINGO4, NGL1, SALM1, SALM5, and TrkB) were expressed exclusively in neuronal tissues, whereas others (ISLR1, GPR124, and Adlican2) exhibited non-neuronal expression profiles. However, the majority of LRRIG protein family exhibited broad mRNA tissue-expression profiles.

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