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- W1575346518 abstract "The amphibian Xenopus is an ectothermic vertebrate in which the MHC has been studied extensively at the functional, biochemical, and genetic levels. A cDNA clone corresponding to the MHC class la gene (Xela-UAA1f) of Xenopus laevis was isolated by screening a cDNA phage library with oligonucleotides based on NH2-terminal protein sequence. Three pieces of evidence support its status as a class la gene: 1) Previous biochemical data suggested that only one polymorphic class la molecule is expressed per MHC haplotype in X. laevis. NH2-terminal sequencing of the class I protein encoded by the f haplotype showed a single unambiguous sequence of the first 22 amino acids; the deduced protein sequence of the cDNA clone matches precisely to this peptide sequence; 2) Genes that hybridized to the cDNA clone segregated perfectly with the serologically typed MHC in two family studies; and 3) There is a strong conservation of amino acids in the peptide-binding region that have been shown in mammals to dock peptides at their NH2- and COOH-termini. In contrast to all other species that have been examined, there appears to be only one class I locus present in the MHC of X. laevis. Xenopus speciates by allopolyploidization, and there are Xenopus species with different levels of ploidy (2n-12n). Functionally, the MHC has been shown to be diploidized in most Xenopus species. As in previous studies with MHC class II and HSP70 probes, there is a trend toward maintaining a diploid number of class la genes in all Xenopus species regardless of their chromosome number, probably accomplished through a deletional mechanism. Thus, there is a strong pressure in Xenopus to maintain very few MHC-linked class I genes, exemplified both by the number of class I genes per MHC haplotype and by the number of class la genes per organism." @default.
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- W1575346518 date "1993-11-15" @default.
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- W1575346518 title "Isolation of a classical MHC class I cDNA from an amphibian. Evidence for only one class I locus in the Xenopus MHC." @default.
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- W1575346518 doi "https://doi.org/10.4049/jimmunol.151.10.5376" @default.
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