Increased DNA methyltransferase expression in rhabdomyosarcomas

Area of Science:

• Molecular Biology
• Oncology
• Epigenetics

Background:

• DNA methylation is crucial for maintaining normal cellular function.
• Aberrant DNA methyltransferase (DNMT) expression is implicated in various human cancers.
• Rhabdomyosarcoma, a common pediatric soft tissue cancer, warrants investigation into DNMT's role.

Purpose of the Study:

• To develop and apply a standardized assay for quantifying DNMT mRNA levels in rhabdomyosarcoma.
• To compare DNMT expression between rhabdomyosarcoma subtypes and normal skeletal muscle.
• To investigate the association between DNMT expression and rhabdomyosarcoma tumorigenesis.

Main Methods:

• Developed a standardized reverse transcription-polymerase chain reaction (RT-PCR) assay.
• Analyzed DNMT mRNA expression in 32 rhabdomyosarcoma samples (18 embryonal, 14 alveolar).
• Normalized DNMT expression to beta-actin and compared with 12 normal skeletal muscle samples.

Main Results:

• All rhabdomyosarcoma samples exhibited increased DNMT mRNA expression compared to normal muscle.
• Average DNMT expression was 6.7-fold higher in embryonal rhabdomyosarcoma and 3.7-fold higher in alveolar rhabdomyosarcoma.
• The difference in DNMT expression increase between the two subtypes was statistically significant.

Conclusions:

• Increased DNA methyltransferase expression is associated with rhabdomyosarcoma, supporting its role in neoplastic transformation.
• Distinct DNMT expression levels in embryonal and alveolar subtypes suggest subtype-specific roles.
• Further research is needed to elucidate the precise role of elevated DNMT in rhabdomyosarcoma development and progression.