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Cis and Trans Acting Elements/Sites

  1. Jan 28, 2004 #1
    I am a bit confused I guess about exactly what these are. If anyone could offer up an example of each, I would be very grateful. I did find this much:

  2. jcsd
  3. Jan 29, 2004 #2


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    Monique ask the same question in this thread

    Basically, cis is an element that is on the same DNA molecules and trans is something on a different molecules.

    Best example is with the lac operon. In wild type strain, LacI and lacO are cis acting elements. If you knock-out lacI and complement the defective strain with a plasmid carrying lacI. The lacI on the plasmid is an example of a trans acting element.
    Last edited: Jan 29, 2004
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