Dyad symmetry
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In genetics, dyad symmetry refers to two areas of a DNA molecule whose base pair sequences are repeats of each other, inverted relative to each other, or are palindromes.
Dyad symmetry is known to have a role in the rho independant method of trancription termination in E.coli. Regions of dyad symmetry in the DNA sequence stall the RNA polymerase enzyme as it transcribes them. A hairpin loop is formed from transcription of these regions of this DNA which is thought to destabilise the binding of the RNA polymerase enzyme to DNA, therefore terminating transcription.
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