Abstract:
:We report on the analyses of genes encoding immunoglobulin heavy and light chains in the rabbit 6.51× whole genome assembly. This OryCun2.0 assembly confirms previous mapping of the duplicated IGK1 and IGK2 loci to chromosome 2 and the IGL lambda light chain locus to chromosome 21. The most frequently rearranged and expressed IGHV1 that is closest to IG DH and IGHJ genes encodes rabbit VHa allotypes. The partially inbred Thorbecke strain rabbit used for whole-genome sequencing was homozygous at the IGK but heterozygous with the IGHV1a1 allele in one of 79 IGHV-containing unplaced scaffolds and IGHV1a2, IGHM, IGHG, and IGHE sequences in another. Some IGKV, IGLV, and IGHA genes are also in other unplaced scaffolds. By fluorescence in situ hybridization, we assigned the previously unmapped IGH locus to the q-telomeric region of rabbit chromosome 20. An approximately 3-Mb segment of human chromosome 14 including IGH genes predicted to map to this telomeric region based on synteny analysis could not be located on assembled chromosome 20. Unplaced scaffold chrUn0053 contains some of the genes that comparative mapping predicts to be missing. We identified discrepancies between previous targeted studies and the OryCun2.0 assembly and some new BAC clones with IGH sequences that can guide other studies to further sequence and improve the OryCun2.0 assembly. Complete knowledge of gene sequences encoding variable regions of rabbit heavy, kappa, and lambda chains will lead to better understanding of how and why rabbits produce antibodies of high specificity and affinity through gene conversion and somatic hypermutation.
journal_name
Immunogeneticsjournal_title
Immunogeneticsauthors
Gertz EM,Schäffer AA,Agarwala R,Bonnet-Garnier A,Rogel-Gaillard C,Hayes H,Mage RGdoi
10.1007/s00251-013-0722-9subject
Has Abstractpub_date
2013-10-01 00:00:00pages
749-62issue
10eissn
0093-7711issn
1432-1211journal_volume
65pub_type
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