Phenotypic spectrum of fetal Smith-Lemli-Opitz syndrome.

Abstract:

:The Smith-Lemli-Opitz syndrome (SLOS) is an autosomal recessive multiple congenital malformation syndrome caused by dehydrocholesterol reductase deficiency. The diagnosis is confirmed by high 7- and secondarily 8-dehydrocholesterol levels in plasma and tissues and/or by detection of biallelic mutations in the DHCR7 gene. The phenotypic spectrum of SLOS is broad, ranging from a mild phenotype combining subtle physical anomalies with behavioral and learning problems, to a perinatally lethal multiple malformations syndrome. The fetal phenotype of SLOS has been poorly described in the literature. We report a series of 10 fetuses with molecularly proven SLOS. Even in young fetuses, the facial dysmorphism appears characteristic. Genital abnormalities are rare in 46,XX subjects. Gonadal differentiation appears histologically normal and in agreement with the chromosomal sex, contrary to what has been previously stated. We observed some previously unreported anomalies: ulnar hypoplasia, vertebral segmentation anomalies, congenital pulmonary adenomatoid malformation, fused lungs, gastroschisis, holomyelia and hypothalamic hamartoma. This latter malformation proves that SLOS phenotypically overlaps with Pallister-Hall syndrome which remains clinically a major differential diagnosis of SLOS.

journal_name

Eur J Med Genet

authors

Quélin C,Loget P,Verloes A,Bazin A,Bessières B,Laquerrière A,Patrier S,Grigorescu R,Encha-Razavi F,Delahaye S,Jouannic JM,Carbonne B,D'Hervé D,Aubry MC,Macé G,Harvey T,Ville Y,Viot G,Joyé N,Odent S,Attié-Bitach T

doi

10.1016/j.ejmg.2011.12.002

subject

Has Abstract

pub_date

2012-02-01 00:00:00

pages

81-90

issue

2

eissn

1769-7212

issn

1878-0849

pii

S1769-7212(11)00131-5

journal_volume

55

pub_type

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