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Genetic and clinical aspects of Charcot‐Marie‐Tooth's disease

The prevalence of Charcot‐Marie‐Tooth's disease (CMT) was studied in Western Norway, an area with several isolated districts with a population of 725,000 (1968). Three hereditary types were distinguished in the area: autosomal dominant CMT with an estimated prevalence of 36/100,000; X‐linked recessive CMT with a prevalence of 3.6/100,000; and autosomal recessive CMT with a prevalence of 1.4/100,00. Gene frequencies were 3 · 7. 10‐4, 1 · 9. 10‐4, and 4 · 8. 10‐4 in autosomal dominant, X‐linked, and autosomal recessive CMT, respectively, while the corresponding mutation rates were 13 · 0, 5 · 5, and 3 · 5 per million gametes per generation. The penetrance was almost complete for all three variants of CMT.