The mouse homolog of the human proto-oncogene MAS was mapped by two interspecific backcrosses to the proximal portion of MMU 17. Higher resolution mapping was accomplished through the analysis of genotypes duplicated or deleted for a megabase-size subregion within MMU 17. The results demonstrate a map position for Mas in the close vicinity of Igf2r, which encodes another membrane receptor known to undergo genomic imprinting. The data provide further evidence for the clustering of genes in a 1-Mb region of chromosome 17, with the absence of any identified genes in a nearby region likely to be six times larger.
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