CAG repeat polymorphism in androgen receptor and infertility: A case-control study.

Area of Science:

• Reproductive Biology
• Human Genetics
• Molecular Endocrinology

Background:

• Androgen receptor (AR) gene regulates male phenotype and spermatogenesis.
• Polymorphisms in the AR gene, specifically CAG trinucleotide repeats, affect AR protein function and sperm production.
• Altered CAG repeat lengths in the AR gene are investigated as a potential cause of male infertility.

Purpose of the Study:

• To determine if increased CAG repeat frequency in the AR gene is associated with unexplained infertility in men with oligozoospermia and azoospermia.
• To investigate the role of AR gene CAG repeat polymorphisms in male infertility.
• To explore the genetic basis of male factor infertility.

Main Methods:

• Case-control study involving 84 men (42 infertile, 42 fertile).
• Polymerase chain reaction (PCR) used to determine CAG repeat frequency in the AR gene.
• Agarose gel electrophoresis employed to analyze differences in CAG repeat lengths.

Main Results:

• Mean CAG repeat length was 17.5 in infertile men and 16.11 in fertile men (p=0.46).
• No significant difference in mean CAG repeat length was observed between groups.
• The majority of men in both groups (88.1% infertile, 71.41% fertile) had 13-23 CAG repeats.

Conclusions:

• No significant correlation found between AR gene CAG repeat length and male factor infertility in Iranian men.
• The study suggests that CAG repeat length in the AR gene is not a primary cause of infertility in this population.
• Further research should consider regulatory factors and epigenetic changes in male infertility.