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Nuclear Myosin VI stabilises Ku-associated DNA ends during nonhomologous end joining

ABSTRACT: DNA double-strand breaks (DSBs) require rapid signalling and physical stabilisation of broken DNA ends to preserve genome integrity. Here, we identify myosin VI (MVI) as an ATM-regulated component of the DSB response. DNA damage induces rapid nuclear accumulation and nanoscale reorganisation of MVI across multiple cell models, in an ATM-dependent manner. Pharmacological or genetic perturbation of MVI attenuates γH2AX signalling and disrupts Ku80 organisation, while DNA damage persists. This leads to increased sensitivity to cisplatin and bleomycin. Super-resolution imaging reveals spatial association of MVI with Ku80-containing repair structures, implicating MVI in non-homologous end joining (NHEJ). In a minimal reconstituted system, MVI and actin enhance the proximity of Ku70/80-bound DNA ends. Together, our findings identify MVI as a regulator of DSB repair that links ATM signalling to Ku-associated DNA-end stabilisation and suggest that targeting MVI may sensitise tumour cells to genotoxic therapy

ORGANISM(S): Mus musculus

PROVIDER: GSE347582 | GEO | 2026/09/21

REPOSITORIES: GEO

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Nuclear Myosin VI stabilises Ku-associated DNA ends during nonhomologous end joining

Project description:Nuclear Myosin VI stabilises Ku-associated DNA ends during nonhomologous end joining

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The KU70-SAP domain has an overlapping function with DNA-PKcs in limiting the lateral movement of KU along DNA

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