The ALS/FTD-linked protein CHCHD10 associates with the TDP-43 C-terminal domain through a CHCH-helix interface

Verdict. CHCHD10 is a mitochondrial protein genetically and pathologically linked to TDP-43 dysfunction, but the molecular basis connecting both proteins has remained unclear. It intersects mitochondrial stress/dysfunction themes (mitochondrial dysfunction; disease context; aging).

What the authors report

Aggregation and cytoplasmic mislocalization of TDP-43 are defining features of several neurodegenerative disorders including Amyotrophic Lateral Sclerosis (ALS) and frontotemporal dementia (FTD). Yet the molecular interactions that regulate its transition from reversible assemblies to aggregation-prone states remain poorly understood.

Key results stated in the abstract include the following. CHCHD10 is a mitochondrial protein genetically and pathologically linked to TDP-43 dysfunction, but the molecular basis connecting both proteins has remained unclear. Here, we combine solution Nuclear Magnetic Resonance (NMR) spectroscopy, biophysical assays and cellular imaging to characterize the interaction between human CHCHD10 and the C-terminal region of TDP-43 (TDP-43CTD). Reciprocal NMR titrations show that the CHCH domain binds the conserved hydrophobic helix of TDP-43CTD through a dynamic submicromolar interaction that overlaps with self-association surfaces in both proteins.

Why it matters for mitochondrial biology

Within mitochondrial research, this work maps primarily to redox biology, aging, computational. It is relevant to mitochondrial dysfunction discourse because the abstract invokes mitochondrial dysfunction, disease context, aging, neurodegeneration. That does not by itself establish a validated disease mechanism; it indicates thematic proximity. Server: biorxiv. Posted 2026-08-06. Synthesis confidence is bounded by abstract completeness.

Study design (abstract-level)

Here, we combine solution Nuclear Magnetic Resonance (NMR) spectroscopy, biophysical assays and cellular imaging to characterize the interaction between human CHCHD10 and the C-terminal region of TDP-43 (TDP-43CTD). These findings define a CHCH-helix interface that couples homo- and heterotypic assembly equilibria and support an asymmetric interface-buffering model in which CHCHD10 can divert TDP-43CTD from self-association while increasing its own availability for recruitment into sedimentable assemblies.

Principal findings

1. CHCHD10 is a mitochondrial protein genetically and pathologically linked to TDP-43 dysfunction, but the molecular basis connecting both proteins has remained unclear.
2. Here, we combine solution Nuclear Magnetic Resonance (NMR) spectroscopy, biophysical assays and cellular imaging to characterize the interaction between human CHCHD10 and the C-terminal region of TDP-43 (TDP-43CTD).
3. Reciprocal NMR titrations show that the CHCH domain binds the conserved hydrophobic helix of TDP-43CTD through a dynamic submicromolar interaction that overlaps with self-association surfaces in both proteins.
4. CHCHD10 alters the formation of ThT-reactive TDP-43CTD assemblies and reduces TDP-43CTD sedimentation under selected stoichiometric conditions, while itself becoming enriched in the sedimentable fraction.
5. Equilibrium calculations, independently reproduced using a complete numerical mass-balance solution, identify the initial non-homodimeric CHCHD10 population as the strongest predictor of its subsequent sedimentation.

Limitations of this brief

• This Mitos brief is an abstract-level synthesis of a preprint; it is not peer review and not a substitute for reading the full paper.
• Preprint status: findings may change with revision or journal review.
• Effect sizes, n numbers, statistics, and full experimental controls are typically incomplete at abstract resolution.
• Comparator/control language is weak or absent in the abstract, limiting causal inference from this brief alone.
• Primary source: biorxiv DOI 10.64898/2026.08.01.742190 (posted 2026-08-06).

Open scientific questions

• Which specific experimental panels in the full paper establish the strongest causal claim, and how robust are the controls?
• How do these findings sit relative to prior literature on the same pathway—replication, contradiction, or incremental extension?

Bottom line

For mitochondrial biologists focused on redox biology, aging, computational, this preprint is worth full-text review if the topic matches your program. Abstract-level takeaway: CHCHD10 is a mitochondrial protein genetically and pathologically linked to TDP-43 dysfunction, but the molecular basis connecting both proteins has remained unclear. Confirm methods, effect sizes, and controls in the full PDF before citing the result as established.

Bibliographic record

Abstract-based editorial synthesis by Mitos. Not peer review.