Allelic variation at the V(H)a locus in natural populations of rabbit (Oryctolagus cuniculus, L.)

• Tipo: Artigo em Revista Científica Internacional
• Data: 2004

Autores

Esteves, PJ (Autor) Outra; Lanning, D (Autor) Outra; ferrand, n (Autor) FCUP; Knight, KL (Autor) Outra; Zhai, SK (Autor) Outra; van der Loo, W (Autor) Outra

Revista

Título: Journal of Immunology

Vol. 172

Páginas: 1044-1053

ISSN: 0022-1767

Editora: American Association of Immunologists

Indexação

ISI Web of Knowledge - 25 Citações

Scopus - 26 Citações

Outras Informações

ID Authenticus: P-000-BYS

DOI: 10.4049/jimmunol.172.2.1044

Abstract (EN): The large interallelic distances between the three rabbit Ig V(H)a lineages, a1 a2 and a3, suggest that the persistence time of the V(H)a polymorphism could amount to 50 million years, which is much longer than that of MHC polymorphisms. Rabbit originated in the Iberian Peninsula where two subspecies coexist, one of which is confined to Southwestern Iberia (Oryctolagus cuniculus algirus). We studied the V-H loci in the original species range to obtain a better understanding of the evolutionary history of this unusual polymorphism. Serological surveys revealed that sera from the subspecies algirus, when tested with V(H)a locus-specific alloantisera, showed either cross-reactivity ("a-positive" variants) or no reaction at all ("a-blank"). Using RT-PCR, we determined 120 sequences of rearranged V-H genes expressed in seven algirus rabbits that were typed as either a-positive or a-blank. The data show that the V-H genes transcribed in a-positive rabbits are closely related to the V(H)1 alleles of domestic rabbits. In contrast, a-blank rabbits were found to preferentially use V-H genes that, although clearly related to the known V(H)a genes, define a new major allotypic lineage, designated a4. The a4 sequences have hallmark rabbit VHa residues together with a number of unprecedented amino acid changes in framework region 2 and 3. The net protein distances between the V(H)a4 and,the V(H)a1, a2, and a3 lineages were 20, 29, and 21% respectively. We conclude that at least four distantly related lineages of the rabbit V(H)a locus exist, one of which seems to be endemic in the Iberian range.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10