7 Mitochondrial DNA Mutations Phenocopy VHL Loss to Drive Non-Clear Cell RCC

Q: What does this research mean for the field?

Mitochondrial DNA mutations act as a shared driver across non-clear cell renal cell carcinoma subtypes by phenocopying the metabolic effects of VHL loss, which increases the 2-hydroxyglutarate/alpha-ketoglutarate ratio and promotes a stem-like transcriptional state. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.ESTABLISHES_NEW_DIRECTION.

Ziad Bakouny; Rachel Saxe; Neil Ruthen; Sonia Boscenco; Ji-Young Kim; Ruobing Cui; Andrea López Sanmiguel; Ritesh Kotecha; Maria Carlo; Martin Voß; A Ari Hakimi; Robert Motzer; Payam Gammage; Ed Reznik; Craig Thompson

doi:10.1093/oncolo/oyag312.008

September 1, 2026The OncologistOpen Access

7 Mitochondrial DNA Mutations Phenocopy VHL Loss to Drive Non-Clear Cell RCC

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Key Points

To determine whether recurrent mitochondrial DNA mutations functionally mimic VHL deficiency to drive metabolic reprogramming and tumor progression in non-clear cell renal cell carcinoma.
Profiled mitochondrial DNA variants across tumor cohorts in TCGA (N = 3,265 total; N = 324 RCC) and MSK-IMPACT (N = 22,252 total; N = 568 RCC).
Engineered isogenic cell lines harboring the complex I mutation m.11696G>A at varying heteroplasmy levels using DddA-derived cytidine base editors.
Characterized metabolic changes using mass spectrometry, Seahorse, and YSI assays, and assessed single-cell transcriptional states via DOGMA-seq.
Truncating electron transport chain mutations in complex I were significantly more frequent in non-clear cell renal tumors than clear cell tumors (pRCC: 34.0%, chRCC: 20.0%, ccRCC: 8.6%).
Heteroplasmic complex I mutations suppressed oxygen consumption, boosted glucose uptake and lactate output, and elevated the L-2-hydroxyglutarate to alpha-ketoglutarate ratio.
Single-cell DOGMA-seq revealed that increasing levels of mitochondrial mutation heteroplasmy directly correlate with the induction of OCT4, NANOG, and SOX2 stem-like signatures.

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Implication

Translational study demonstrates that mitochondrial DNA mutations phenocopy VHL loss in non-clear cell renal cell carcinoma, highlighting a shared metabolic driver of tumor stemness.

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Cite This Study

Bakouny et al. (2026) studied this question.

synapsesocial.com/papers/6a99365f636c6408cfa7f6e7 https://doi.org/10.1093/oncolo/oyag312.008

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7 Mitochondrial DNA Mutations Phenocopy VHL Loss to Drive Non-Clear Cell RCC

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7 Mitochondrial DNA Mutations Phenocopy VHL Loss to Drive Non-Clear Cell RCC

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