Screening of SLC25A13 mutation in the Thai population
摘要
660dup）,[Ⅳ]（p.S225X）,[Ⅴ]（IVS13+1G>A）,and[XIX]（g.IVS16ins3kb）using a newly developed TaqMan and established HybProbe assay,respectively.Sanger sequencing was employed for specimens showing an aberrant peak to confirm the targeted mutation as well as the unknown aberrant peaks detected.Frequencies of the mutations identified were compared in each region.Carrier frequency and disease prevalence of citrin deficiency caused by SCL25A13 mutations were estimated.RESULTS:p.Met1?was identified in the heterozygous state in 85 individuals,giving a carrier frequency of1/18,which suggests possible selective advantage of this variant.The question of p.Met1?homozygote lethality remains unanswered which may serve as an explanation as to why this homozygote has yet to be identified in patients/controls even with high allele frequency.The p.Met1?mutation has rarely been studied in populations other than Thai and Chinese;therefore,may have been overlooked.Development of the TaqMan assay in the present study would allow a simple,rapid,and cost-effective method for mass screening.Heterozygous mutations:[XIX]and[Ⅰ]were identified in 17 individuals,giving a carrier rate of 1/90 and a calculated homozygote rate of 1/33000.Two novel variants,g.IVS11+17C>G and c.1311C>T,of unknown clinical significance were identified at low frequency.CONCLUSION:This study highlighted the current underestimation of citrin deficiency and suggests the possible selective advantage of the p.Met1?allele.