Protein Phosphorylation Alterations in Myotonic Dystrophy Type 1: A Systematic Review

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• Myotonic Dystrophy type 1 (DM1) is a common adult muscular dystrophy.
• It stems from CTG triplet expansion in the DMPK gene, causing toxic mRNA gain of function.
• This leads to impaired splicing and signaling pathway dysfunction, often involving protein phosphorylation.

Approach:

• A systematic review of PubMed and Web of Science databases was performed.
• 41 articles were analyzed to characterize protein phosphorylation alterations in DM1 across human, animal, and cell models.

Key Points:

• Twenty-nine kinases, 3 phosphatases, and 17 phosphoproteins were found to be altered in DM1.
• Impaired signaling pathways include AKT/mTOR, MEK/ERK, PKC/CUGBP1, and AMPK, affecting cell functions like glucose metabolism, cell cycle, myogenesis, and apoptosis.
• These alterations contribute to DM1 manifestations such as insulin resistance and increased cancer risk.

Conclusions:

• Protein phosphorylation changes contribute to DM1 complexity and multisystemic symptoms.
• Altered pathways explain increased insulin resistance and cancer risk in DM1 patients.
• Further research into specific phosphorylation alterations may reveal therapeutic targets for DM1.