A linkage and physical map of chromosome 22, and some applications to gene mapping.

A genetic map of human chromosome 22 has been derived from physical assignments and multilocus linkage analysis. It consists of the loci for the immunoglobulin lambda light-chain variable (IGLV) and immunoglobulin lambda light-chain constant (IGLC) regions, myoglobin (MB), the sis proto-oncogene (SIS), and an arbitrary probe (D22S1). The first RFLPs at the loci for SIS, IGLV, and MB are described. The most likely gene order on the basis of multilocus analysis was cen-(IGLV-IGLC)-D22S1-MB-SIS. This map provides further evidence for localization of the P1 polymorphism of the P blood group to chromosome 22, close to the SIS locus. Analysis of families segregating recessive congenital methemoglobinemia (RCM), a disease in which the cytochrome b5 reductase is defective, as well as of families with cases of hereditary low levels of cytochrome b5 reductase activity, confirmed that the locus responsible for RCM is on chromosome 22. Biochemical studies had already suggested that mutation at the cytochrome b5 reductase locus (DIA1) is responsible for RCM. We found no evidence of genetic heterogeneity between the families segregating RCM and the families exhibiting cases of low cytochrome b5 reductase activity. Linkage analysis indicated that the most probable location of DIA1 lies between MB and SIS.

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