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A study on genetic aspects of male infertility in North-east Indian population, India
© Barbhuiya et al; licensee BioMed Central Ltd. 2012
Published: 1 October 2012
Male infertility refers to the inability of a male to achieve a pregnancy in a fertile female . Genetic factors are an important cause of male infertility. The present study was aimed to determine the role of Y-chromosome microdeletion and mitochondrial DNA (mtDNA) mutations - two major causes of male infertility, with special emphasis on patients of North-east India.
Materials and methods
A total of 500 infertile male patients attending private infertility clinics of Guwahati, Assam, were selected for the study. Blood and semen samples were collected from the patients. Genomic DNA was isolated from both type of samples and PCR amplification was carried out using specific primer sets. The genes and sequence-tagged site (STS) markers included in the study are: DBY, USP9Y, PRY-2, RBMY, BPY-2, XKRY, CDY-1, CSPG4LY, DAZ, sY84, sY254, sY127, SY145, sY152 and sY153. All genes and STS were amplified efficiently in samples from 100 fertile men tested, but failed to be amplified in samples from fertile women. In order to study the role of mtDNA in sperm motility, semen DNA from 50 patients including 10 Asthenospermic, 20 Asthenoteratozoospermic and 20 oligoasthenoteratozoospermic patients and 20 fertile men were studied using specific primers for four mitochondrial genes, namely ND2, ND4, ATPase6 and ATPase8 followed by DNA sequencing.
mtDNA mutations found in infertile patients
Type of Infertility
At nucleotide position
At amino acid position
Nature of mutation
The study reveals that the frequency of Yq microdeletion is higher in semen samples than blood samples, possibly because most of the genes studied are testis-specific in nature. This is in accordance with the previous studies [3, 4]. In both types of samples AZFd regions has highest frequency of Yq microdeletion. The mtDNA mutations common in fertile and infertile patients have also been reported by other Indian researchers , but doubted to play any role in infertily . The mutation G9064A in ATPase6 has also been reported to play a role in female infertility . Beside these, the other mtDNA mutations observed in the present study have not been reported previously.
This work was supported by DST Grant under the research project to Dr. Rita Mahanta and also DST grant under Women Scientist-A (WOS-A) scheme to PNBC. Authors are also thankful to the doctors and technicians of the infertility clinics from where the samples have been collected for their support.
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