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Quick Scroll Transposon Silencing Keeps Jumping Genes in Their Place 09.13.06 (2 years ago) #1
SUMMARY: Nearly a century ago, two geneticists described “rogue” pea plants with an unorthodox pattern of inheritance. William Bateson and Caroline Pellew found that crossing inferior rogues with normal plants always produced rogue offspring, suggesting that the rogue appearance was a dominant trait. The real surprise came when rogue progeny were crossed back to normal plants. Following the principles of Mendelian inheritance, these crosses should have produced a mix of normal and rogue plants, but they produced only rogue plants. The phenomenon, later dubbed “paramutation,” allowed the rogues to break the rules by acting “epigenetically”—inducing heritable changes in gene expression without DNA mutations. In one-sided interactions between gene pairs, or alleles, only “paramutagenic” alleles can attenuate, and eventually silence, the expression of “paramutable” alleles.

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