[Analysis of TSC gene mutations in five patients with tuberous sclerosis complex].

OBJECTIVE: To identify pathogenic mutations of TSC1 and TSC2 genes in two familial and one sporadic cases with tuberous sclerosis complex (TSC). METHODS: For five patients and their family members, potential mutations of the TSC1 and TSC2 genes were detected by direct sequencing. RESULTS: For one family, a novel missense mutation c.1964C>T (p.S655F) was detected in the exon 19 of the TSC2 gene. For the sporadic patient, a repeat substitution with deletion mutation c.5238-5255delCATCAAGCGGCTCCGCCA (p.His1746GlnfsX56) was detected in the exon 40 of the TSC2 gene, which led to a stop codon TGA after the 56th amino acids. No mutation was found in another family. CONCLUSION: The missense mutation c.1964C>T(P.S655F) and the substitution with deletion mutation 5238-5255delCATCAAGCGGCTCCGCCA(p.His1746GlnfsX56) of the TSC2 gene probably underlie the disease in the first family and the sporadic case.