Trisomy X
(also: Triple XXX Syndrome)
Table of Contents
General Information
This is an intersex variation where a person is born with 47XXX chromosomes instead of the typical 46XX. If the additional X chromosome is from the parent's original sperm or egg cell, then they will have 47XXX chromosomes in all of their cells. If the additional chromosome appeared early during the embryo's development process instead, only some cells will have 47XXX chromosomes and the person will be born with a mosaic chromosome pattern. The chromosomal patterns 46XX/47XXX or 45X/47XXX are examples of mosaicism involving Trisomy X.
Most people with 47XXX chromosomes do not develop any variations in their other sex characteristics. However, some may have ovaries that stop producing hormones at an age that is earlier than typical, and some may not menstruate.
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