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Structure and diversity of Mexican axolotl lambda light chains.

Abstract：

:We report here the structure of cDNA clones encoding axolotl light chains of the lambda type. A single IGLC gene and eight different potential IGLV genes belonging to four different families were detected. The axolotl Cgamma domain has several residues or stretches of residues that are typically conserved in mammalian, avian, and Xenopus Cgamma, but the KATLVCL stretch, which is well conserved in the Cgamma and T-cell receptor Cbeta domains of many vertebrate species, is not well conserved. All axolotl Vgamma sequences closely match several human and Xenopus Vgamma-like sequences and, although the axolotl Cgamma and Vgamma sequences are very like their tetrapod homologues, they are not closely related to nontetrapod L chains. Southern blot experiments suggested the presence of a single IGLC gene and of a limited number of IGLV genes, and analysis of IGLV-J junctions clearly indicated that at least three of the IGLJ segments can associate with IGLV1, IGLV2, or IGLV3 subgroup genes. The overall diversity of the axolotl Vgamma CDR3 junctions seems to be of the same order as that of mammalian Vgamma chains. However, a single IGLV4 segment was found among the 45 cDNAs analyzed. This suggests that the axolotl IGL locus may have a canonical tandem structure, like the mammalian IGK or IGH loci. Immunofluorescence, immunoblotting, and microsequencing experiments strongly suggested that most, if not all L chains are of the gamma type. This may explain in part the poor humoral response of the axolotl.

journal_name

Immunogenetics

journal_title

Immunogenetics

authors

André S,Guillet F,Charlemagne J,Fellah JS

doi

10.1007/s002510000264

subject

Has Abstract

pub_date

2000-11-01 00:00:00

pages

137-44

issue

1-2

eissn

0093-7711

issn

1432-1211

journal_volume

52

pub_type

杂志文章

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