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A balanced translocation is a structural chromosomal rearrangement in which two chromosomes break at specific points and exchange segments with each other. The exchanged pieces reattach to the opposite chromosome, so the total amount of genetic material in the cells stays exactly the same nothing is added and nothing is missing. Only the arrangement of the genetic material changes.
There are two main types:
1. Reciprocal translocation – segments are exchanged between two non-homologous chromosomes (chromosomes that are not a matching pair).
2. Robertsonian translocation – two acrocentric chromosomes (chromosomes with the centromere positioned very close to one end, such as chromosomes 13, 14, 15, 21, and 22) fuse together at the centromere, with loss of the very small, gene-poor short arms. This loss is usually clinically insignificant, so the rearrangement is still considered balanced.Because the full complement of genetic material is retained, a balanced translocation is fundamentally different from other chromosomal abnormalities such as deletions, duplications, or unbalanced translocations, where genetic material is genuinely gained or lost. It occurs in roughly 1 in 500 to 1 in 625 individuals in the general population, making it one of the more common structural chromosomal variations, most of whom are entirely unaware of it unless it is picked up during genetic testing.
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