Biallelic TMEM126B Variants as a Novel Cause of Kidney Failure-Implications for Mitochondrial Genetic Testing in Nephrology: A Response Letter.
Sarah Hammond, Dervla M Connaughton
✦ AI-curated · Sources linked
Case in brief
A 47-year-old male presented with childhood exercise intolerance, suspected hypertrophic cardiomyopathy, and progressive kidney failure. Initial genetic testing for inherited kidney diseases was inconclusive. However, updated exome sequencing revealed a homozygous TMEM126B variant, which is linked to mitochondrial dysfunction. This case underscores the need for ongoing updates in genetic testing to enhance diagnostic accuracy and patient management.
Diagnostic / clinical pearl
Clinicians should consider biallelic TMEM126B variants in patients with unexplained kidney failure and multisystem symptoms, as these may indicate underlying mitochondrial dysfunction.
Why it matters
This case emphasizes the importance of regularly updating genetic testing panels to capture emerging genetic causes of complex diseases, thereby improving diagnostic yield and patient outcomes.