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Grange, D.K. et al.

Grange, Kratz, Braverman, Kelley,

CHILD syndrome caused by deficiency of 3beta-hydroxysteroid-delta8, delta7-isomerase.

CHILD (congenital hemidysplasia, ichthyosis, and limb defects) syndrome is a rare, usually sporadic disorder associated with unilateral distribution of ichthyosiform skin lesions, limb defects, punctate calcifications of cartilaginous structures, and visceral anomalies. CHILD syndrome shares some manifestations with X-linked dominant Conradi-HÃ¼nermann syndrome (CDPX2), although the skeletal defects and skin lesions in CDPX2 are bilateral and asymmetric. Because CDPX2 patients have abnormal 8-dehydrosterol metabolism caused by mutations in 3beta-hydroxysteroid-delta8,delta7-isomerase, we measured plasma sterols in a patient with CHILD syndrome and found levels of 8-dehydrocholesterol and 8(9)-cholestenol increased to the same degree as in CDPX2 patients. Subsequently, we identified a nonsense mutation in exon 3 of the patient's 3beta-hydroxysteroid-delta8,delta7-isomerase gene. We speculate that at least some cases of CHILD syndrome are allelic with CDPX2 caused by 3beta-hydroxysteroid-delta8,delta7-isomerase deficiency.[1]

References

CHILD syndrome caused by deficiency of 3beta-hydroxysteroid-delta8, delta7-isomerase. Grange, D.K., Kratz, L.E., Braverman, N.E., Kelley, R.I. Am. J. Med. Genet. (2000) [Pubmed]

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