XYYYY syndrome
Rare chromosomal disorder
XYYYY syndrome
XYYYY syndrome, also known as 49,XYYYY, is an exceptionally rare chromosomal disorder in which a male human has three additional copies of the Y chromosome. Only seven non-mosaic cases of the disorder have ever been recorded in the medical literature, as well as five mosaic cases, of which two had more 48,XYYY than 49,XYYYY cells. Due to the extreme rarity of the disorder, little is understood about it, and the phenotype appears to be variable.
Read on Wikipedia · Image Caroline Demily, Alice Poisson, Elodie Peyroux, Valérie Gatellier, Alain Nicolas, Caroline Rigard, Caroline Schluth-Bolard, Damien Sanlaville & Massimiliano Rossi, CC BY 4.0
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