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21.04.2015 | Original Article

Mitochondrial complex I and V gene polymorphisms associated with breast cancer in mizo-mongloid population

verfasst von: Sunaina Thapa, Freda Lalrohlui, Souvik Ghatak, John Zohmingthanga, Doris Lallawmzuali, Jeremy L. Pautu, Nachimuthu Senthil Kumar

Erschienen in: Breast Cancer | Ausgabe 4/2016

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Abstract

Background

Mizoram has the highest incidence of cancer in India. Among women, breast cancer is most prevalent and the state occupies fifth position globally. The reason for high rate of cancer in this region is still not known but it may be related to ethnic/racial variations or lifestyle factors.

Methods

The present study aims to identify the candidate mitochondrial DNA (mtDNA) biomarkers—ND1and ATPase for early breast cancer diagnosis in Mizo population. Genomic DNA was extracted from blood samples of 30 unrelated breast cancer and ten healthy women. The mtNDI and mtATP coding regions were amplified by step-down PCR and were subjected to restriction enzyme digestion and direct sequencing by Sanger method. Subsequently, the results of the DNA sequence analysis were compared with that of the revised Cambridge Reference Sequence (rCRS) using Mutation Surveyor and MITOMAP.

Results

Most of the mutations were reported and new mutations that are not reported in relationship with breast cancer were also found. The mutations are mostly base substitutions. The effect of non-synonymous substitutions on the amino acid sequence was determined using the PolyPhen-2 software. Statistical analysis was performed for both cases and controls. Odds ratios (ORs) and 95 % confidence intervals (CIs) were estimated from logistic regression. High intake of animal fat and age at menarche was found to be associated with a higher risk of breast cancer in Mizo population.

Conclusion

Our results also showed that ATPase6 as compared to ATPase8 gene is far more predisposed to variations in Mizo population with breast cancer and this finding may play an important role in breast cancer prognosis.

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Titel: Mitochondrial complex I and V gene polymorphisms associated with breast cancer in mizo-mongloid population
verfasst von: Sunaina Thapa
Freda Lalrohlui
Souvik Ghatak
John Zohmingthanga
Doris Lallawmzuali
Jeremy L. Pautu
Nachimuthu Senthil Kumar
Publikationsdatum: 21.04.2015
Verlag: Springer Japan
Erschienen in: Breast Cancer / Ausgabe 4/2016
Print ISSN: 1340-6868
Elektronische ISSN: 1880-4233
DOI: https://doi.org/10.1007/s12282-015-0611-1

Springer Medizin

Mitochondrial complex I and V gene polymorphisms associated with breast cancer in mizo-mongloid population