< b>Centric-fusion translocation: A type of chromosome rearrangement, also
called a Robertsonian translocation, in which there is fusion of an entire long
arm of one acrocentric chromosome with a similarly intact long arm of another acrocentric
chromosome. The short arms of the chromosomes participating in the translocation
are usually lost.
Acrocentric chromosomes have their centromere near but not at the very end of
the chromosome. In humans, chromosomes 13-15, 21 and 22 are acrocentric.
Centric-fusion translocations are relatively common. In balanced form, they take
the place of two acrocentric chromosomes and result in no problems. But in unbalanced
form, centric-fusion translocations account for some cases of the trisomy 13 (Patau)
syndrome and trisomy 21 (Down) syndrome.
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