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. 1985 Apr;82(7):2082–2086. doi: 10.1073/pnas.82.7.2082

Immunoglobulin VH gene structure and diversity in Heterodontus, a phylogenetically primitive shark.

G W Litman, L Berger, K Murphy, R Litman, K Hinds, B W Erickson
PMCID: PMC397496  PMID: 3920659

Abstract

A mouse VH probe has been used to identify and isolate VH homologs in a DNA library of Heterodontus francisci (horned shark). The complete nucleotide sequence of one VH gene, HXIA, has been determined and found to exhibit striking organizational homology and nucleotide identity with mammalian prototype VH genes. Metric analysis of the complete sequence is consistent with the early phylogenetic diversification of framework and complementarity-determining regions (CDR). Both the predicted amino acid sequence and the specific hybridization of the CDR2-specific, synthetic oligodeoxynucleotide probe in spleen mRNA suggest that HXIA is functionally expressed. A probe consisting of the entire coding region of this gene hybridizes with multiple components in Southern blot analysis of Heterodontus genomic DNA and together with the identification of additional unique VH+-lambda clones indicates that considerable complexity is associated with the germline VH gene family in a contemporary species that represents an early stage in the phylogenetic development of the vertebrates.

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Selected References

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