AIMTo identify submicroscopic interstitial deletions in azoospermia factor (AZF) loci in idiopathic and non-idiopathic cases of male infertility in Indians.

METHODSOne hundred and twenty two infertile males with oligozoospermia or azoospermia were included in this study. Semen analysis was done to determine the sperm density, i.e., normospermia (>20 million/mL), oligozoospermia (<20 million/mL) or azoospermia. They were subjected to detailed clinical examination and endocrinological and cytogenetic study. Thirty G-banded metaphases were analyzed in the 122 cases and polymerase chain reaction (PCR) microdeletion analysis was done in 70 cytogenetically normal subjects. For this genomic DNA was extracted using peripheral blood. The STS primers tested in each case were sY84, sY86 (AZFa); sY127, sY134 (AZFb); sY254, sY255 (AZFc). PCR amplifications found to be negative were repeated at least 3 times to confirm the deletion of a given marker. The PCR products were analyzed on a 1.8 % agarose gel.

RESULTSEight of the 70 cases (11.4 %) showed deletion of at least one of the STS markers. Deletions were detected in cases with known and unknown aetiology with bilateral severe testiculopathy and also in cryptorchid and varicocele subjects.

CONCLUSIONAZF microdeletions were seen in both idiopathic and non-idiopathic cases with cryptorchidism and varicocele. The finding of a genetic aetiology in infertile men with varicocele and cryptorchidism suggests the need for molecular screening in non-idiopathic cases.

Adult ; Biopsy, Needle ; Chromosome Banding ; Chromosomes, Human, Y ; Cryptorchidism ; genetics ; Follicle Stimulating Hormone ; blood ; Gene Deletion ; Genetic Loci ; Humans ; Male ; Metaphase ; Oligospermia ; etiology ; genetics ; Polymerase Chain Reaction ; Reference Values ; Semen ; chemistry ; Seminal Plasma Proteins ; genetics ; Sperm Count ; Testis ; pathology ; Varicocele ; genetics

AIMTo determine if Yq microdeletion frequency and loci of deletion are similar in two tissues (blood and sperm) of different embryological origin.

METHODSThe present study included 52 infertile oligozoospermic cases. In each case, DNA was isolated from blood and sperms and polymerase chain reaction (PCR) microdeletion analysis was done from genomic DNA isolated from both the tissues. The PCR products were analyzed on a 1.8% agarose gel. PCR amplifications found to be negative were repeated at least three times to confirm the deletion of a given marker.

RESULTSOnly 1 case harbored microdeletion in blood DNA, whereas 4 cases harbored microdeletion in sperm DNA.

CONCLUSIONThe frequency of Yq microdeletions is higher in germ cells as compared to blood. As the majority of infertile couples opt for assisted reproduction procreation techniques (ART), Yq microdeletion screening from germ cells is important to understand the genetic basis of infertility, to provide comprehensive counseling and most adapted therapeutics to the infertile couple.

Chromosomes, Human, Y ; genetics ; DNA ; blood ; genetics ; isolation & purification ; Humans ; Male ; Repetitive Sequences, Nucleic Acid ; Sequence Deletion ; Spermatozoa ; physiology