General
Tetrasomy X (XXXX syndrome, also 48,XXXX) is a rare chromosomal disorder caused by the presence of four X chromosomes. Under normal circumstances, a female has two X chromosomes. Therefore, tetrasomy X occurs only in females.
Tetrasomy X was first described in 1961, and approximately 100 cases have been reported worldwide. It is classified as a chromosomal aneuploidy, meaning it arises due to an error in meiosis (cell division).
Diagnosis:
Diagnosis is based on genetic testing, which confirms the presence of four X chromosomes. In general, the prognosis for girls with tetrasomy X is relatively good. Due to the variability of symptoms, some patients live completely normal lives, while others require medical care.
Treatment:
Treatment focuses on managing associated complications. Like other genetic chromosomal abnormalities, it cannot be cured definitively.
- characteristic facial features
- abnormalities of joints and muscles
- delayed speech and articulation development
- flat nose
- small mouth
- cleft palate
- delayed tooth development or missing teeth
- hypotonia (reduced muscle tone)
- abnormal spinal curvature
- immune dysfunction leading to more frequent infections
- sometimes failure to develop secondary sexual characteristics
- delayed or absent puberty
- absence of menstruation
- vision or hearing impairment
- cardiovascular complications
- kidney failure
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