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- W148965850 abstract "Harlequin ichthyosis (HI) is a devastating genodermatosis that is often fatal during the neonatal period. Until the identifi cation of ABCA12-encoding a keratinocyte lipid transporter, as the causative gene for HI, prenatal diagnosis (PNDx) had been performed for more than 20 years by electron microscopic examination of fetal skin biopsy samples. We report here the fi rst case of DNA-based PNDx for HI. The proband, the fi rst child of healthy non-consanguineous French parents, showed a typical HI phenotype and died soon after birth. ABCA12 immunostaining was markedly reduced in the proband’s skin. Direct sequence analysis of ABCA12 revealed that the proband was a compound heterozygote for two novel mutations: a maternal nonsense mutation p.Ser1249X in exon 26 and a paternal missense mutation p.Arg2479Lys occurring at the last codon of exon 50. p.Ser1249X leads to an approximate 52 % truncation of the ABCA12 protein losing both ATP-binding cassette active sites. p.Arg2479Lys involves a highly conserved codon among diverse species in the second ABCA12 ATP-binding cassette. For their third pregnancy, the parents requested PNDx. Direct sequence analysis using fetal genomic DNA from amniotic fl uid cells at 17 weeks of pregnancy revealed that the fetus was a compound heterozygote for both mutations. The fetus was predicted to be affected and the parents requested the pregnancy to be terminated. The aborted fetus showed typical signs of HI. Analysis of ABCA12 transcripts of cultured keratinocytes from the abortus showed the presence of six abnormally spliced products arising from the allele carrying the missense mutation. Four of them lead to premature termination codons while the two others produced deleted proteins missing 21 and 31 amino acids in the second ATP-binding cassette. These results indicated residual expression of ABCA12. The present report paves the way for molecular PNDx of HI in the earlier stages of pregnancy" @default.
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- W148965850 date "2006-01-01" @default.
- W148965850 modified "2023-09-28" @default.
- W148965850 title "DNA-based prenatal diagnosis of harlequin ichthyosis with residual ABCA12 expression" @default.
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