Abstract

Purpose Repeated pregnancy loss (RPL) occurs in 1 out of 300 couples, and the cause of about 50 of them remains idiopathic. Mitochondria have an important role in human development through ATP production and their involvement in apoptosis. Methods 96 RPL and 96 control females were used to investigate the frequency of deletions and point mutations in the displacement loop (D-loop) on mitochondria. Multiplex PCR and DNA sequencing methods were used to detect possible variations in the mitochondrial DNA (mtDNA). Results No deletions but a high frequency of point mutations were found in RPL females; among 129 variations observed in RPL, 22 mutations were significant (P<0.05) and the insertion of C in nucleotide 114 was novel. Conclusion High rate of mutations in D-loop of mtDNA was observed in maternal blood, a fact that may have a direct or indirect role in inducing RPL. The results can be used in the assessment of RPL and designing possible treatments for improving assisted reproduction. © Springer Science+Business Media, LLC 2010.