Assignment of the lens intrinsic membrane protein MP19 structural gene to human chromosome 19

We have isolated and characterized a bovine cDNA clone encoding the bovine lens intrinsic membrane protein, MP19. This cDNA was used as a probe to analyze a panel of Southern blots of human-Chinese hamster somatic cell hybrid DNAs to assign the gene coding for MP19 to its human chromosome. Control human and Chinese hamster DNAs displayed a distinct EcoR1 restriction fragment pattern when hybridized with the bovine MP19 cDNA. When somatic cell hybrid DNAs were restricted with Eco R1 and Southern blots hybridized with the bovine MP19 cDNA, the characteristic human restriction pattern was observed only when human chromosome 19 was present in the hybrid panel. This assignment was confirmed using a human chromosome 19-specific genomic library. A clone from this human chromosome 19-specific library was identified and further characterized. This clone contained a 7.9 kilobase fragment that contained identical DNA sequences with that of the authentic bovine MP19 cDNA, and with a separate human genomic clone containing the MP19 gene.