Novel Mitochondrial Mutations in the ATP6 and ATP8 Genes in Patients with Breast Cancer

Overview

Journal Mol Med Rep

Specialty Molecular Biology

Date 2014 Aug 12

PMID 25110199

Citations 19

Authors

Ludmila Grzybowska-Szatkowska

Brygida Slaska

Jolanta Rzymowska

Anna Brzozowska

Boleslaw Florianczyk

Affiliations

Soon will be listed here.

Abstract

The role of the mitochondria in the process of carcinogenesis, mainly oxidative phosphorylation, mostly concerns their participation in the production of free radicals and ATP and in the process of apoptosis. The purpose of this study was to detect potential changes in the genes encoding the subunits 6 and 8 of the ATP synthase and their impact on the enzyme's biochemical properties, structure and function in patients with breast tumors. The tested material was mitochondrial DNA (mtDNA) isolated from specimens of ductal carcinoma (carcinoma ductale) Tp1-2Np0-1Mp0, blood and non-cancerous tissue of mammary gland (control), sampled from 50 patients who had been operated for breast cancer. In the case of missense-type changes in the mtDNA, protein prediction software was used to assess their effect on the biochemical properties of the protein, its structure and function. We identified 8 changes in the ATP6 gene in 36/50 examined breast cancer cell samples and 5 changes in the ATP8 gene (10/50). Most of them were homoplasmic changes of missense type. Four of the changes (A8439C, G8858C, C9130G and T9119G) had not been described in the literature before. The identified mutations and polymorphisms, especially those of missense type, can affect mitochondrial functions, especially if the conservative domain of the protein is concerned. Replacement of 'wild-type' mtDNA by mutated mtDNA can be an important event in carcinogenesis.

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