Mutation-induced DNMT1 cleavage drives neurodegenerative disease.

ABSTRACT: Specific mutations within the replication foci targeting sequence (RFTS) domain of human DNMT1 are causative of two types of adult-onset neurodegenerative diseases, HSAN1E and ADCA-DN, but the underlying mechanisms are largely unknown. We generated Dnmt1-M1 and Dnmt1-M2 knock-in mouse models that are equivalent to Y495C and D490E-P491Y mutation in patients with HSAN1E, respectively. We found that both mutant heterozygous mice are viable, have reduced DNMT1 proteins, and exhibit neurodegenerative phenotypes including impaired learning and memory. The homozygous mutants die around embryonic day 10.5 and are apparently devoid of DNMT1 proteins. We present the evidence that the mutant DNMT1 proteins are unstable, most likely because of cleavage within RFTS domain by an unidentifi

SUBMITTER: Wang W 

PROVIDER: S-EPMC8442919 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature