The mutation underlying myotonic dystrophy (DM, MIM* 160900) is the expansion of a CTG trinucleotide repeat sequence at the 3' untranslated region of a protein kinase gene (MT-PK).' The kinetics of this process is influenced by the sex of the transmitting par- ent and size of the parental allele.2 Con- genital DM (CDM) occurs almost always with maternal transmission. Only two patients with CDM have proven paternal
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Gennarelli et al. (1994) studied this question.
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