Female external genitalia and müllerian duct derivatives in a 46,XY infant with the smith-lemli-Opitz syndrome

American Journal of Medical Genetics
M G BialerM L Lesser

Abstract

We report on a 46,XY newborn infant with Smith-Lemli-Opitz (SLO) syndrome with female external genitalia, intraabdominal testes with epididymides and deferent ducts and a normally shaped uterus and vagina. Polydactyly, cleft palate, and several internal organ malformations were also present, and the patient died shortly after birth. Data on six reported male infants with SLO syndrome and female external genitalia suggest a correlation between degree of genital involvement and overall degree of severity. Scoring systems to quantify overall degree of severity (SLO score) and degree of genital involvement in males (genital score) were devised and applied to 122 reported cases from the literature. Statistical analyses showed a unimodal distribution of the SLO severity scores, and positive correlations between the SLO score and the genital score in males, the presence of polydactyly, and the presence of cleft palate. In 19 multiplex families the affected sibs were generally similar in their SLO scores. The above analyses suggest that the wide phenotypic variability in the SLO syndrome is determined by variable expressivity of the same entity as opposed to genetic heterogeneity. The observed phenotypic correlations naturally determin...Continue Reading

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