Related Experiment Videos
Micropenis and the AR Gene: mutation and CAG repeat-length analysis.
1Department of Pediatrics, Keio University School of Medicine, Tokyo 160-8582, Japan.
The Journal of Clinical Endocrinology and Metabolism
|November 10, 2001
Summary
Androgen receptor (AR) gene mutations are rare in boys with isolated micropenis. The study found no significant expansion of CAG repeat lengths in these patients, suggesting AR gene alterations are not a primary cause.
Area of Science:
- Genetics
- Endocrinology
- Pediatrics
Background:
- Androgen receptor (AR) gene mutations and CAG repeat expansions are linked to hypospadias and genital ambiguity.
- The role of the AR gene in isolated micropenis, without other genital abnormalities, remains understudied.
Purpose of the Study:
- To investigate the prevalence of AR gene mutations and CAG repeat length variations in Japanese boys with isolated micropenis.
- To determine if AR gene alterations are associated with isolated micropenis lacking hypospadias or genital ambiguity.
Main Methods:
- Analyzed exons 1-8 and flanking introns of the AR gene in 64 Japanese boys with isolated micropenis using denaturing HPLC and direct sequencing.
- Determined CAG repeat length at exon 1 via electrophoresis and direct sequencing, comparing results to 100 control males.
Main Results:
- A single AR gene mutation (3' splice site intron 1) was identified in one patient with definite micropenis.
- No statistically significant differences were found in CAG repeat length distribution or the frequency of long CAG repeats between patients and controls.
Conclusions:
- AR gene mutations appear to be rare in children with isolated micropenis.
- CAG repeat length is not significantly expanded in isolated micropenis, suggesting it is not a major contributing factor.