Mael is essential for cancer cell survival and tumorigenesis through protection of genetic integrity

Area of Science:

• Molecular Biology
• Cancer Research
• Genetics

Background:

• Germ line-specific genes are activated in somatic cells during tumorigenesis, termed cancer germline genes.
• Genes involved in piRNA (Piwi-interacting RNA) processing are critical for cancer progression.

Purpose of the Study:

• To investigate the role of the spermatogenic transposon silencer maelstrom (Mael) in cancer cell malignant transformation and survival.
• To determine the therapeutic potential of targeting Mael in cancer treatment.

Main Methods:

• Analysis of Mael isoform expression in human cancer cell lines.
• Depletion of Mael and assessment of resulting cell death phenotypes (apoptosis, senescence).
• Measurement of reactive oxygen species and DNA damage markers.
• Investigation of Mael's dependence on ATM and its role in Myc/Ras-induced transformation and senescence.
• Evaluation of Mael's effect on retrotransposon activity.

Main Results:

• A specific Mael isoform was overexpressed in diverse human cancer cell lines.
• Mael depletion induced cancer-specific cell death, characterized by apoptosis, senescence, increased reactive oxygen species, and DNA damage.
• These effects were dependent on ATM (Ataxia Telangiectasia Mutated).
• Mael was essential for Myc/Ras-induced transformation and inhibited Ras-induced senescence.
• Mael repressed retrotransposon activity in cancer cells, suggesting an oncogenic role in maintaining genomic stability.

Conclusions:

• Mael depletion induces ATM-dependent DNA damage, leading to specific cell death in cancer cells.
• Mael exhibits oncogenic potential by protecting against genetic instability and promoting cancer cell survival.
• Targeting Mael represents a potential therapeutic strategy for cancer treatment.