Mutations in human DNA methyltransferase DNMT1 induce specific genome-wide epigenomic and transcriptomic changes in...

Area of Science:

• Epigenetics
• Neuroscience
• Genetics

Background:

• DNA methyltransferase type 1 (DNMT1) maintains DNA methylation patterns crucial for cellular function.
• DNMT1 mutations are linked to autosomal dominant cerebellar ataxia, deafness and narcolepsy (ADCA-DN), a complex neurological disorder.

Purpose of the Study:

• To investigate the epigenomic and transcriptomic consequences of DNMT1 mutations in patient-derived cells.
• To identify genes and pathways affected by DNMT1 dysfunction in ADCA-DN.

Main Methods:

• Generation of fibroblasts, induced pluripotent stem cells (iPSCs), and induced neurons (iNs) from ADCA-DN patients and controls.
• Analysis of DNA methylation patterns and gene expression profiles using epigenomic and transcriptomic techniques.

Main Results:

• Cell type-specific alterations in DNA methylation and gene expression were observed in ADCA-DN patient cells.
• Negative correlation between DNA methylation and gene expression changes in iPSCs and iNs.
• Identification of specific genes (e.g., PDGFB, PRDM8, NR2F1) associated with ADCA-DN phenotypes.
• ZFP57 showed hypomethylation and upregulation in patient-derived iPSCs and iNs.

Conclusions:

• DNMT1 mutations induce distinct cellular epigenetic and transcriptomic changes contributing to ADCA-DN.
• The study highlights the role of ZFP57 dysregulation in ADCA-DN pathogenesis.
• Findings offer potential therapeutic targets and insights into related neurological disorders.