[Sex-linked mental retardation].

Abstract excerpt

It has long been known that among patients with mental retardation males outnumber females. This is the result of mutations in X-chromosomal genes: X-linked mental retardation. Its prevalence has been estimated as 1.8/1000 males with a carrier frequency of 2.4/1000 females. X-linked mental retardation is divided into syndromic and non-specific types. At present there are about 135 syndromic forms known of 26 of...

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