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Stable Longitudinal Methylation Levels at the CpG Sites Flanking the CTG Repeat of in Patients with Myotonic Dystrophy Type 1. | LitMetric

Stable Longitudinal Methylation Levels at the CpG Sites Flanking the CTG Repeat of in Patients with Myotonic Dystrophy Type 1.

Genes (Basel)

Kennedy Center, Department of Clinical Genetics, Copenhagen University Hospital, Rigshospitalet, 2600 Glostrup, Denmark.

Published: August 2020

AI Article Synopsis

Article Abstract

Myotonic dystrophy type 1 (DM1) is an autosomal dominant multisystem disorder mainly characterized by gradual muscle loss, weakness, and delayed relaxation after muscle contraction. It is caused by an expanded CTG repeat in the 3' UTR of , which is transcribed into a toxic gain-of-function mRNA that affects the splicing of a range of other genes. The repeat is unstable, with a bias towards expansions both in somatic cells and in the germline, which results in a tendency for earlier onset with each generation, as longer repeat lengths generally correlate with earlier onset. Previous studies have found hypermethylation in the regions flanking the repeat in congenital onset DM1 and in some patients with non-congenital DM1. We used pyrosequencing to investigate blood methylation levels in 68 patients with non-congenital DM1, compare the methylation levels between the blood and muscle, and assess whether methylation levels change over time in the blood. We found higher methylation levels in the blood of DM1 patients than in healthy controls and especially in the patients who had inherited the disease allele maternally. The methylation levels remained relatively stable over time and are a strong biomarker of the disease, as well as of the maternal inheritance of the disease.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7465187PMC
http://dx.doi.org/10.3390/genes11080936DOI Listing

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