Exon 5 encoding the transmembrane region of HLA-A contains a transitional region for the induction of nonsense-mediated mRNA decay.

Abstract excerpt

HLA class I alleles containing premature termination codons (PTCs) are increasingly being found. To understand their effects on MHC class I expression, HLA-A*2402 mutants containing PTCs were transfected into class I-deficient cells, and expression of HLA-A mRNA and protein was determined. In exons 2, 3, and 4, and in the 5' part of exon 5, PTCs reduced mRNA levels by up to 90%, whereas in the 3' part of exon 5...

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