Objective: To analyze the clinical and genetic features of 9 ethnic Han Chinese patients with disseminated superfacial actinic porokeratosis (DSAP).
Methods: Genomic DNA was extracted from peripheral blood samples collected from the patients. PCR and direct sequencing were carried out for five patients from a family, 4 sporadic cases, and 120 healthy controls to identify potential mutations of four genes (MVK, MVD, PMVK, FDPS) involved in the mevalonate pathway as well as SLC17A9, SSH1, and SART3 genes. Pathogenecity of suspected mutations were assessed with SIFT, and Polyphen-2 scores.
Results: A c.746T>C mutation was identified in the family and two sporadic cases, while a c.875A>G mutation was identified in another sporadic case. No mutation was identified in the remainder genes among all patients. Scoring has suggested that the c.746T>C and c.875A>G mutations of the MVD gene are probably pathogenic.
Conclusion: c.746 T>C and c.875A>G of the MVD gene are most common mutations. Skin rashes of the patients have a strong connection with the sunlight, albeit a significant difference among patients was discovered.