A cost-effective method for detecting mutations in the human FAM111B gene associated with POIKTMP syndrome

BackgroundMutations of the human FAM111B gene are associated with hereditary fibrosing poikiloderma with tendon contracture, myopathy, and pulmonary fibrosis (POIKTMP), a rare and autosomal dominant multi-systemic fibrosing disease. To date, a total of 36 cases are documented, with eleven associated mutations identified and confirmed by Whole-Exome Sequencing and Sanger sequencing. However, these methods require a certain level of expertise. The FAM111B gene was annotated using the SNAPGENE tool to identify various restriction enzymes. The enzymes that cut at the positions where mutations of interest have been reported were selected. The method was implemented using the DNA samples extracted from the skin fibroblast collected from an affected South African family and unrelated control. ResultsThe findings showed that of the eleven FAM111B mutational sites investigated with this method, ten mutations can be identified including the known mutation FAM111B NM_198947.4: c.1861T>G (pTyr621Asp) associated with the POIKTMP in South Africa.ConclusionsLimited access to molecular diagnosis contributes to why POIKTMP is rarely diagnosed. Our study describes an inexpensive PCR-RFLP method to screen for POIKTMP FAM111B gene mutations. The PCR-RFLP can be used as a cost-effective method for diagnosing FAM111B mutations in POIKTMP, and it does not require having robust experience in molecular biology.