Porokeratosis comprises heterogeneous keratinization disorders that are characterized by one or more atrophic patches surrounded by a ridge-like cornoid lamella. In this study, we evaluated seven families affected by porokeratosis and five sporadic patients of the disease in a Chinese population. We performed Sanger sequencing of exons and flanking intron-exon boundaries of mevalonate pathway genes (MVD, MVK, PMVK and FDPS) and of SLC17A9. In five familial and three sporadic patients, we detected six variations, including four novel mutations (MVD c.1A>G; p.Met1?, c.916G>A; p.Ala306Thr, c.1013+1G>A, and PMVK c.65A>G; p.Lys22Arg) and two recurrent mutations (MVD c.746T>C; p.Phe249Ser, and MVK c.1028T>C; p.Leu343Pro). We then applied I-TASSER and iGEMDOCK to assess these variants for probable functional impacts. The findings of this study extend the mutation spectrum of porokeratosis and provide further evidence for the genetic basis of this disease.
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