title: Unequal crossing-over: a common basis of single alpha-globin genes in Asians and American blacks with hemoglobin-H disease.
abstract: The alpha-globin genes of five black Americans, two Chinese, and five Filipinos with HbH disease (an alpha-thalassemia state in which there is a single functional alpha gene) were analyzed by restriction endonuclease techniques. All subjects were found to have one chromosome 16, lacking both alpha genes, and another containing a single alpha gene (--/-alpha). Restriction endonuclease patterns of the DNA obtained from all 12 subjects were identical and compatible with unequal crossing-over as the mechanism of origin of the single alpha gene in these individuals.
mesh_terms: D044383:Black People; D002681:China; D002872:Chromosome Deletion; D003434:Crossing Over, Genetic; D004262:DNA Restriction Enzymes; D005796:Genes; D005914:Globins / Q000235:genetics*; D006447:Hemoglobin H / Q000235:genetics*; D006455:Hemoglobins, Abnormal / Q000235:genetics*; D006801:Humans; D010679:Philippines; D013789:Thalassemia / Q000235:genetics; D001741:Black or African American
chemical_list: D006455:Hemoglobins, Abnormal; D005914:Globins; D006447:Hemoglobin H; D004262:DNA Restriction Enzymes