Gonadoblastoma and Y-chromosome fluorescence

Area of Science:

• Genetics
• Oncology
• Reproductive Medicine

Background:

• Mosaic chromosomal abnormalities, including 45,X/46,XY, are associated with disorders of sex development.
• Gonadoblastoma is a rare tumor that can arise in dysgenetic gonads.

Purpose of the Study:

• To investigate the relationship between Y chromosome fluorescence and gonadoblastoma development in patients with 45,X/46,XY mosaicism.
• To review existing literature on gonadoblastoma in patients with 45,X/46,XY mosaicism and Y chromosome alterations.

Main Methods:

• Case series analysis of patients with 45,X/46,XY and related karyotypes.
• Review of medical literature for documented cases of gonadoblastoma in patients with 45,X/46,XYnf mosaicism.

Main Results:

• Three patients with 45,X/46,XY mosaicism and a fluorescent Y chromosome developed gonadoblastomas.
• Three patients with 45,X/46,XYnf mosaicism (lacking distal Yq fluorescence) did not develop gonadoblastomas.
• Literature review found no documented cases of gonadoblastoma in patients with well-characterized 45,X/46,XYnf mosaicism.

Conclusions:

• Alterations in the distal Yq fluorescence may confer protection against gonadoblastoma in patients with 45,X/46,XY mosaicism.
• Y chromosome fluorescence is a potential indicator for gonadoblastoma risk in individuals with gonadal dysgenesis.