Expression pattern of LRR and Ig domain-containing protein (LRRIG protein) in the early mouse embryo.
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.
Department of Anatomy, School of Medicine, Fukushima Medical University, Fukushimashi, Fukushima 960-1295, Japan. shomma@fmu.ac.jp
Shunsaku
S
Homma
Takako
T
Shimada
Tsuyoshi
T
Hikake
Hiroyuki
H
Yaginuma
D000595:Amino Acid Sequence; D000818:Animals; D004622:Embryo, Mammalian / Q000378:metabolism*; D005260:Female; D018507:Gene Expression Regulation, Developmental; D007136:Immunoglobulins / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism; D017403:In Situ Hybridization; D007930:Leucine / Q000737:chemistry*; D000090263:Leucine-Rich Repeat Proteins; D051379:Mice; D008813:Mice, Inbred ICR; D008969:Molecular Sequence Data; D009474:Neurons; D011247:Pregnancy; D011506:Proteins / Q000235:genetics* / Q000378:metabolism; D015347:RNA Probes
D007136:Immunoglobulins; D000090263:Leucine-Rich Repeat Proteins; D011506:Proteins; D015347:RNA Probes; D007930:Leucine