Noncoding rare variants of TBX6 in congenital anomalies of the kidney and urinary tract.
Shuangshuang DongChunyan WangXueping LiQian ShenXiaoyi FuMingyan WuChengcheng SongNan YangYanhua WuHongyan WangLi JinHong XuFeng ZhangPublished in: Molecular genetics and genomics : MGG (2019)
Congenital anomalies of the kidney and urinary tract (CAKUT) are a wide range of congenital structural renal defects. CAKUT is the leading cause of chronic renal failure and end-stage renal disease in children. Studies in humans and animal models have confirmed the large genetic contribution to CAKUT. The previous evidence suggested that human TBX6 coding mutations might cause CAKUT via gene-dosage insufficiency. However, the potential involvement of TBX6 noncoding mutations in CAKUT remains to be elucidated. Here, we described DNA sequencing and copy-number analysis of TBX6 in 269 Chinese subjects with CAKUT. Interestingly, we identified two heterozygous noncoding variants of TBX6 in sporadic subjects with CAKUT: one is c.769-7delT, from a subject with duplex renal and collecting system, and the other is a 3' untranslated region (3'-UTR) variant (c.1392C>T) from a subject with unilateral renal hypoplasia. These two TBX6 noncoding variants are novel and extremely rare, respectively, in human populations archived in the ExAC database. The mini-gene splicing assay showed that the TBX6 c.769-7delT variant significantly reduced the splicing efficiency of TBX6 intron 5 when compared to the wild-type control. In this work, we identified a novel splicing variant of TBX6 in human CAKUT. Our experimental observations suggested that the TBX6 noncoding variant can affect gene expression and may potentially be involved in human CAKUT.
Keyphrases
- copy number
- endothelial cells
- mitochondrial dna
- gene expression
- genome wide
- urinary tract
- induced pluripotent stem cells
- end stage renal disease
- dna methylation
- pluripotent stem cells
- chronic kidney disease
- young adults
- peritoneal dialysis
- wild type
- late onset
- single molecule
- single cell
- high throughput
- cell free
- transcription factor
- human health
- case control