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Klinefelter syndrome
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Klinefelter syndrome is a genetic disorder that affects males. What defines it is one chromosome too many: instead of a single X chromosome, there are two or more. The karyotype, which is the portrait of a person's full set of chromosomes, is usually 47,XXY.
That extra material does not just sit there. It contributes to hyalinization and fibrosis of the testis, two ways for a tissue to harden and be replaced by inert material. The result is primary gonadal failure, meaning that the failure lies in the gonad itself, in the testis, and not in the signals reaching it from the brain. Like a sponge that slowly hardens: still in place, but no longer doing its job.
It usually presents with small testes and gynecomastia, which is growth of breast tissue. And in adults, hypogonadism, which is insufficient production of sex hormones, and infertility are typical.
In brief
Klinefelter syndrome is a genetic disorder that affects males and is characterized by two or more X chromosomes; the typical karyotype is 47,XXY.
The extra X chromosome material contributes to hyalinization and fibrosis of the testis and leads to primary gonadal failure.
Like a sponge that slowly hardens: still in place, but no longer doing its job.
It usually presents with small testes and gynecomastia, and hypogonadism and infertility are typical in adults.
Sources (1)
- National Center for Biotechnology Information, StatPearls PublishingKlinefelter Syndrome, StatPearlsPublished
This page explains the topic in general terms; it does not tell anyone what treatment to follow.
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