• Internal medicine · Jan 2025

    A Novel Heterozygous and Pathogenic Variant of the HNF1B Gene Associated with Autosomal Dominant Tubulointerstitial Kidney Disease with a Broad Spectrum of Extrarenal Phenotypes: A Case Report.

    • Jun-Ya Kaimori, Jun Matsuda, Asif Jan, Yuki Kawano, Takayuki Kawaoka, Yuta Asahina, Yohei Doi, Tatsufumi Oka, Miho Nagata, Yasuki Ishihara, Yohei Miyashita, Toshihiro Asano, Yusuke Sakaguchi, and Yoshitaka Isaka.
    • Department of Health and Nutrition, Otemae University, Japan.
    • Intern. Med. 2025 Jan 15.

    AbstractWe encountered a family with hereditary renal failure, renal medullary cysts, pancreatic hypoplasia, hypomagnesemia, liver enzyme abnormalities, and diabetes mellitus (DM). We identified a novel heterozygous variant of HNF1B (NM_000458.4:c.791dup, p.L264Ffs*30) using whole-exome sequencing of genomic DNA samples from this family. This variant is located in the DNA-binding domain of the HNF1B protein and produces a truncated protein with a de novo sequence, suggesting that this variant changes HNF1B binding to genomic DNA or causes nonsense-mediated mRNA decay. Based on the phenotypes and identified gene variants, this family suffers from autosomal dominant tubulointerstitial kidney disease caused by this HNF1B variant.

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