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Vol. 56, No. 3-4, 1991
Issue release date: 1991
Cytogenet Cell Genet 1991;56:178–181

Localization of histidase to human chromosome region 12q22→q24.1 and mouse chromosome region 10C2→D1

Taylor R.G. · García-Heras J. · Sadler S.J. · Lafreniere R.G. · Willard H.F. · Ledbetter D.H. · Mclnnes R.R.
aResearch Institute, The Hospital for Sick Children, and bDepartment of Molecular and Medical Genetics, University of Toronto, Toronto, Ont. (Canada); cInstitute for Molecular Genetics, Baylor College of Medicine, Houston, TX (USA); and4 Department of Genetics, Stanford University, Stanford, CA (USA)

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The human gene for histidase (histidine ammonialyase; HAL), the enzyme deficient in histidinemia, was assigned to human chromosome 12 by Southern blot analysis of human × mouse somatic cell hybrid DNA. The gene was sublocalized to region 12q22→q24.1 by in situ hybridization, using a human histidase cDNA. The homologous locus in the mouse (Hal) was mapped to region 10C2→D1 by in situ hybridization, using a cell line from a mouse homozygous for a 1.10 Robertsonian translocation. These assignments extend the conserved syntenic region between human chromosome 12 and mouse chromosome 10 that includes the genes for phenylalanine hydroxylase, γ interferon, peptidase, and citrate synthase. The localization of histidase to mouse chromosome 10 suggests that the histidase regulatory locus (Hsd) and the histidinemia mutation (his), which are both known to be on chromosome 10, may be alleles of the histidase structural gene locus.

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