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Tetrasomy

Field	Value
name	Tetrasomy
field	Medical genetics
duration	Lifelong

A tetrasomy is a form of aneuploidy with the presence of four copies, instead of the normal two, of a particular chromosome.

Causes

Full

Full tetrasomy of an individual occurs due to non-disjunction when the cells are dividing (meiosis I or II) to form egg and sperm cells (gametogenesis). This can result in extra chromosomes in a sperm or egg cell. After fertilization, the resulting fetus has 48 chromosomes instead of the typical 46.

Autosomal tetrasomies

Cat eye syndrome where partial tetrasomy of chromosome 22 is present
Pallister-Killian syndrome (tetrasomy 12p)
Tetrasomy 9p
Tetrasomy 18p
Tetrasomy 21, a rare form of Down syndrome

Sex-chromosome tetrasomies

Tetrasomy X
XXYY syndrome
XXXY syndrome

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

cytogenetics chromosomal-abnormalities

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