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Mitochondrial DNA copy number in peripheral blood: a potential non-invasive biomarker for female subfertility
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Mitochondrial DNA copy number in peripheral blood: a potential non-invasive biomarker for female subfertility
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Mitochondrial DNA copy number in peripheral blood: a potential non-invasive biomarker for female subfertility
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Journal Article
Mitochondrial DNA copy number in peripheral blood: a potential non-invasive biomarker for female subfertility
2018
Overview
PurposeLow mitochondrial DNA (mtDNA) content in oocytes and in cumulus cells is an indicator of poor oocyte quality. Moreover, initial evidence showed a correlation between mtDNA content in cumulus cells and mtDNA copy number in peripheral blood cells. On these bases, we deemed of interest investigating the correlation between mtDNA copy number in peripheral blood and natural fecundity.MethodsThis is a nested case–control study drawn from a prospective cohort of pregnant women referred for routine first trimester screening for aneuploidies (from 11 + 0 to 12 + 6 weeks of gestation) between January 2012 and March 2013 at the “Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico” of Milan, Italy. Cases were subfertile women who attempted to become pregnant for 12–24 months. Controls were the two subsequently age-matched women who became pregnant in less than 1 year. MtDNA was quantified using real-time PCR and normalized to nuclear DNA.ResultsOne hundred and four subfertile women and 208 controls were selected. The median (IQR) mtDNA copy number was 95 (73–124) and 145 (106–198), respectively (p < 0.001). The area under the ROC curve was 0.73 (95% CI 0.67–0.79) (p < 0.001). The Youden index was 105 mtDNA copy number. The crude OR for subfertility in women with mtDNA copy number below this threshold was 5.72 (95% CI 3.43–9.55). The accuracy of mtDNA copy number assessment in peripheral blood progressively decreased with increasing female age.ConclusionsLow mtDNA copy number in peripheral blood is associated with an increased risk of subfertility and may represent a biomarker of natural fecundity.
