A low polymorphic mouse H-2 class I gene from the Tla complex is expressed in a broad variety of cell types.

We have previously described the isolation of pH-2d-37, a cDNA clone that encodes a so far unknown, poorly polymorphic, class I surface molecule. We report here the isolation of the corresponding gene, its nucleotide sequence, and its localization in the Tla region of the murine MHC. Using a RNase mapping assay, we have confirmed that the second domain coding region of the 37 gene displays very limited polymorphism, and that the gene is transcribed in a broad variety of cell types, in contrast to the genes encoding the known Qa and TL antigens. Possible functions are discussed.