Rogers, Sally L and Göbel, Thomas W and Viertlboeck, Birgit C and Milne, Sarah and Beck, Stephan and Kaufman, Jim (2005) Characterization of the chicken C-type lectin-like receptors B-NK and B-lec suggests that the NK complex and the MHC share a common ancestral region. Journal of Immunology, 174 (6). pp. 3475-83. ISSN 0022-1767Full text not available from this repository.
The sequencing of the chicken MHC led to the identification of two open reading frames, designated B-NK and B-lec, that were predicted to encode C-type lectin domains. C-type lectin domains are not encoded in the MHC of any animal described to date; therefore, this observation was completely unexpected, particularly given that the chicken has a "minimal essential MHC." In this study, we describe the initial characterization of the B-NK and B-lec genes, and show that they share greatest homology with C-type lectin-like receptors encoded in the human NK complex (NKC), in particular NKR-P1 and lectin-like transcript 1 (LLT1), respectively. In common with NKR-P1 and LLT1, B-NK and B-lec are located next to each other and transcribed in opposite orientation. Like human NKR-P1, B-NK has a functional inhibitory signaling motif in the cytoplasmic tail and is expressed in NK cells. In contrast, B-lec contains an endocytosis motif in the cytoplasmic tail, and like LLT1, is an early activation Ag. Further analysis leads us to propose that there are four subgroups of C-type lectin-like receptors in the NKC, which arose as a result of duplication events. Moreover, this analysis suggests that the NKC may be considered a fifth paralogous region, and therefore shares an ancient common origin with the MHC. This provides evidence that C-type lectin-like receptors were present in the preduplication, primordial MHC region, and suggests that an original function of MHC molecules was for recognition by NK cell receptors encoded nearby.
|Subjects:||Q Science > QH Natural history > QH301 Biology
Q Science > QH Natural history > QH426 Genetics
Q Science > QR Microbiology > QR180 Immunology
|Divisions:||Schools and Research Institutes > School of Natural & Social Sciences > Environmental Sciences|
|Research Priority Areas:||Environmental Dynamics & Governance|
|Depositing User:||Sally Rogers|
|Date Deposited:||11 Mar 2015 10:45|
|Last Modified:||26 Aug 2016 11:40|