A novel H-2K splice form: predictions for other alternative H-2 splicing events.
A large number of H-2K and H-2D cDNA clones from a C3HfB/HeN spleen cDNA library were extensively characterized. All H-2Dk cDNAs were shown to exhibit the short form of exon 8, consistent with the presence of a single lariat branchpoint site within intron 7. Twenty-five H-2Kkm2 cDNAs were found to bear a short exon 8, whereas only two clones were shown to carry the longer form of this exon. In one of the H-2Kkm2 cDNAs, a novel pattern of H-2 splicing was identified, in which an extra 15 nucleotides, derived from the 3' end of intron 5, were inserted between the intact and unaltered exon 5 and exon 6 sequences. Resulting from the apparent use of a cryptic splice acceptor site in place of the canonical intron 5 site, this insertion is predicted to generate an in-frame insertion of five nonpolar amino acid residues within a highly polar region of the intracytoplasmic domain of the H-2K polypeptide. The features of this novel splice form served as the basis for predicting additional rare, alternative H-2 pre-mRNA splicing events that might produce functionally relevant microheterogeneity in the encoded H-2 gene products.
Vogel
J M
JM
Department of Genetics, University of California, Berkeley 94720.
Morse
R Y
RY
Goodenow
R S
RS
D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D004247:DNA / Q000378:metabolism; D005091:Exons; D005805:Genes, MHC Class I; D006183:H-2 Antigens / Q000235:genetics / Q000378:metabolism*; D007438:Introns; D051379:Mice; D008809:Mice, Inbred C3H; D012322:RNA Precursors / Q000378:metabolism*; D012326:RNA Splicing; D012260:Ribonucleases
D006183:H-2 Antigens; D012322:RNA Precursors; D004247:DNA; D012260:Ribonucleases