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Focal facial dermal dysplasia, type IV, is caused by mutations in CYP26C1.

Abstract：

:Focal facial dermal dysplasia (FFDD) Type IV is a rare syndrome characterized by facial lesions resembling aplasia cutis in a preauricular distribution along the line of fusion of the maxillary and mandibular prominences. To identify the causative gene(s), exome sequencing was performed in a family with two affected siblings. Assuming autosomal recessive inheritance, two novel sequence variants were identified in both siblings in CYP26C1-a duplication of seven base pairs, which was maternally inherited, c.844_851dupCCATGCA, predicting p.Glu284fsX128 and a missense mutation, c.1433G>A, predicting p.Arg478His, that was paternally inherited. The duplication predicted a frameshift mutation that led to a premature stop codon and premature chain termination, whereas the missense mutation was not functional based on its in vitro expression in mammalian cells. The FFDD skin lesions arise along the sites of fusion of the maxillary and mandibular prominences early in facial development, and Cyp26c1 was expressed exactly along the fusion line for these facial prominences in the first branchial arch in mice. Sequencing of four additional, unrelated Type IV FFDD patients and eight Type II or III TWIST2-negative FFDD patients revealed that three of the Type IV patients were homozygous for the duplication, whereas none of the Type II or III patients had CYP26C1 mutations. The seven base pairs duplication was present in 0.3% of healthy controls and 0.3% of patients with other birth defects. These findings suggest that the phenotypic manifestations of FFDD Type IV can be non-penetrant or underascertained. Thus, FFDD Type IV results from the loss of function mutations in CYP26C1.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Slavotinek AM,Mehrotra P,Nazarenko I,Tang PL,Lao R,Cameron D,Li B,Chu C,Chou C,Marqueling AL,Yahyavi M,Cordoro K,Frieden I,Glaser T,Prescott T,Morren MA,Devriendt K,Kwok PY,Petkovich M,Desnick RJ

doi

10.1093/hmg/dds477

subject

Has Abstract

pub_date

2013-02-15 00:00:00

pages

696-703

issue

4

eissn

0964-6906

issn

1460-2083

pii

dds477

journal_volume

22

pub_type

杂志文章

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