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Nucleotide sequence and structural analysis of the rat RT1.E u and RT1.Aw3 l genes, and of genes related to RT1.O and RT1.C

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Abstract

A cDNA library was constructed using mRNA isolated from the R21 strain of rats which have the major histocompatibility complex (MHC) haplotype RT1.A l B l D l E u and the growth and reproduction complex (grc) genotype grc +. The cDNA clones that hybridized with the class I probes pAG64c and pARI.5 and were 1.3–1.7 kilobases were selected. Full-length clones were identified by sequencing partially the 5′ and 3′ ends of each clone, by the presence of a start codon at the 5′ end, and by a polyadenylation sequence at the 3′end. The full-length cDNA clones were examined for in vitro transcription by transfection into human CIR cells using electroporation, and expression was detected by flow cytometry using monoclonal antibodies specific to the heavy chains and polyclonal antibody to β2-microglobulin. The RT1.E u gene was transcribed and expressed optimally, and its nucleotide and deduced amino acid sequences differed significantly from the RT1.A a, RT1.A l, RT1.A u, LW2, and 11/3R genes but only slightly from the RT1.K gene. The high level of sequence similarity between RT1.E u and RT1.K suggests that the two genes may have originated from a common ancestral gene. In addition, three new genes (RT1.Aw3 l, RT1.C-type, and RT1.O-type) were identified. The RT1.Aw3 l gene is almost identical to RT1.A l with the exception of an in frame deletion of 21 nucleotides in exon 2 leading to a 7 amino acid deletion in the α1 domain of the deduced amino acid sequence and 11 nucleotide substitutions and insertions in the rest of the sequence. It transcribed optimally, but no significant expression was detected. The RT1.C-type gene 119 is very similar (97%) to the LW2 gene in the 3′ untranslated region, which suggests that it is in the RT1.C region. It transcribed optimatically, but no significant expression was detected. The RT1.O-type gene 149 has all the features of a class Ib gene, but a premature stop codon in the α1 domain causes incomplete translation. Its in vitro transcription was very low, and no expression was detected. These studies, combined with previous work, indicate that in the MHC of the R21 strain three class Ia genes (E u, A l, Aw3 l) and three class Ib genes (C-type, O-type, N) are transcribed but only two class Ia genes (E u, Al) are expressed.

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  1. Department of Pathology, University of Pittsburgh, School of Medicine, 15 261, Pittsburgh, PA, USA

    Shashikumar K. Salgar, Heinz W. Kunz & Thomas J. Gill III

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  1. Shashikumar K. Salgar
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Additional information

The nucleotide sequence data reported in this paper have been submitted to the GenBank nucleotide sequence database and have been assigned the accession numbers (RT1.E u) L40365; (RT1.Aw3 l) L40363; clone 119 (RT1.C-type): L40362; clone 149 (RT1.O-type): L40364

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Salgar, S.K., Kunz, H.W. & Gill, T.J. Nucleotide sequence and structural analysis of the rat RT1.E u and RT1.Aw3 l genes, and of genes related to RT1.O and RT1.C . Immunogenetics 42, 244–253 (1995). https://doi.org/10.1007/BF00176441

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