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transposon

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transposon

Segment of DNA able to move within or between chromosomes. Transposons trigger changes in gene expression by shutting off genes or causing insertion mutations.

The origins of transposons are obscure, but geneticists believe some may be the remnants of viruses that have permanently integrated their genes with those of their hosts. They were first identified by US geneticist Barbara McClintock in 1947.



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