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Heterozygous COL4A3/COL4A4 variants: diagnostic trends and clinical kidney outcomes

Key takeaways

This study followed people who carry a single altered copy of the COL4A3 or COL4A4 genes, which help build the kidney's filter. Carrying one copy was long thought to be harmless, but the authors tracked how often it is now found and how those kidneys actually fared over time. Because people were observed rather than assigned to groups, it shows a link between the gene change and kidney outcomes, not proof of cause. It is useful for families deciding whether genetic testing is worth doing.

Who did this work

Yu Tanaka (Kobe University) · Tomoko Horinouchi (Kobe University) · Shuhei Aoyama (Kobe University) · Yuka Kimura (Kobe University) · Yuta Inoki (Kobe University) · Yuta Ichikawa (Kobe University) · Chika Ueda (Kobe University) · Hideaki Kitakado (Kobe University) · Atsushi Kondo (Kobe University) · Nana Sakakibara (Kobe University) · China Nagano (Kobe University) · Tomohiko Yamamura (Kobe University)

Source

Paper · OpenAlex, Kidney disease concept sweep (verified C2778653478) · 2026-09-02
https://doi.org/10.1093/ckj/sfag301