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Mitochondrial genome variability and metabolic alterations reveal new biomarkers of resistance in testicular germ cell tumors

  • 0Cancer Research Institute, Biomedical Research Center, Slovak Academy of Sciences, Bratislava 84505, Slovak Republic.
Cancer Drug Resistance (alhambra, Calif.) +

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January 13, 2025

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January 13, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

New mitochondrial DNA mutations are linked to cisplatin resistance in testicular germ cell tumors (TGCTs). These genetic changes affect cellular respiration and metabolism, offering potential biomarkers for therapy resistance.

Area Of Science

  • Genetics and Genomics
  • Cancer Biology
  • Metabolic Pathways

Background

  • Mitochondrial (mt) genome mutations contribute to metabolic dysfunction and cancer progression.
  • Accumulation of mt mutations is associated with treatment resistance in cancer cells.
  • Understanding these mutations in testicular germ cell tumors (TGCTs) is crucial for identifying therapy resistance markers.

Purpose Of The Study

  • To investigate the mutational status of the mt genome in cisplatin-resistant versus -sensitive TGCT cells.
  • To associate mt genome mutations with cellular respiration, gene expression, and metabolic pathway preferences.
  • To identify novel molecular biomarkers for therapy resistance in TGCTs.

Main Methods

  • Illumina sequencing with Twist Enrichment Panel to identify mt genome mutations in sensitive and resistant TGCT cell lines.
  • High-resolution respirometry (O2k-respirometer Oroboros) to assess cellular respiration.
  • RT-qPCR for differential expression analysis of mt respiratory genes and Glycolysis/OXPHOS assay for metabolic pathway preference.

Main Results

  • New mutations in key mt genes (e.g., MT-ND1-6, MT-CO1-3, MT-ATP6) were identified in resistant TGCT cells.
  • Significant differences in cellular respiration rates and mt respiratory gene expression were observed between sensitive and resistant cell lines.
  • Resistant cells showed a preference for glycolysis, while sensitive cells favored oxidative phosphorylation (OXPHOS), with exceptions noted.

Conclusions

  • New mt gene mutations are associated with altered respiration and metabolic pathways in resistant TGCTs.
  • These findings provide potential novel molecular biomarkers for distinguishing resistant TGCT phenotypes.
  • The identified mutations may also help specify the histological classification of resistant TGCTs.

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