New linkage data for the X-linked types of muscular dystrophy and G6PD variants, colour blindness, and Xg blood groups.
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Modern techniques of molecular biology have made it possible to identify mutations in a number of different hereditary red cell enzyme defects. Most of the studies have been performed in glucose-6-phosphate dehydrogenase deficiency, where a large number of point mutations have been identified. The same mutations are encountered repeatedly, even in patients with defects that were thought, on the basis of biochemical properties of the residual enzyme, to be distinct. A beginning has been made in identifying mutations in a few other red cell enzyme defects.
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Glucose-6-phosphate dehydrogenase was purified from blood samples originating from 33 subjects living in the 'Midi-Pyrenees' region (Southwest France). Biochemical and electrophoretic characteristics of several enzymatic variants were revealed. The distribution of the mutations in the subjects studied gave the following results: (1) Meditteranean Gd(-) and Gd(-)A identified variants; they constitute the main part of our observations. (2) Two original variants confirmed by the WHO International Reference Laboratory, that is: Gd(-) Toulouse and Gd(+) Luz-Saint-Sauveur; the latter mutation did not produce any haematological disorder. Absence of chronic haemolytic anaemia as well as a high rate of favism could be found in the families studied. As it is generally observed in Mediterranean regions, Southwest France population is characterized by a certain heterogeneity in biochemical and genetic mutations.
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