Development in a 46 XX boy with positive SRY gene

Area of Science:

• Genetics
• Endocrinology
• Pediatrics

Background:

• 46 XX male disorder of sex development (DSD) is a rare condition.
• The presence of Y chromosome sequences, specifically the SRY gene, is crucial for male sex determination.

Observation:

• An 11-year-old boy presented with obesity and concerns about underdeveloped genitalia.
• Karyotype revealed 46 XX, but PCR confirmed the presence of Y sequences including the SRY gene.
• Hormonal studies indicated progressive FSH elevation, suggesting germinal epithelium failure.

Findings:

• The patient exhibited normal growth and spontaneous pubertal development.
• Despite normal physical development, elevated FSH levels suggest impaired fertility.
• The presence of the SRY gene in a 46 XX individual is confirmed.

Implications:

• 46 XX males with the SRY gene have a favorable prognosis for growth and development.
• Infertility remains a primary concern for 46 XX males diagnosed at peripubertal age.
• This case highlights the importance of genetic testing in DSD evaluations.