Biology Forum › Genetics › polycistronic = multigenic

last updated by simpleton 14 years, 6 months ago
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    • May 6, 2010 at 7:59 am #13270
      simpleton
      Participant

      Does polycistronic means multigenic? What I understood was polycistronic means that a mRNA molecule code for multiple proteins with spacer and overlapping genes while multigenic just means that a mRNA codes for multiple proteins (no overlapping between genes)?

      but then i see that many reference use this two terms interchangeable! now i’m confused. can anyone help?
      THANKS! 😉

    • May 7, 2010 at 12:50 pm #99613
      Orome
      Participant

      No, multigenic = Describing an inherited characteristic that is specified by a combination of multiple genes
      Next time, try google first…

    • May 7, 2010 at 5:57 pm #99619
      kolean
      Participant

      Polycistronic means more than two genes is transcribed into RNA (does not have to be mRNA (protein encoding), because there are polycistronic miRNAs and other noncoding RNA clusters). Multigenic means more than one gene, in which those genes function to a certain characteristic (and the genes do not have to be in the same place).

      Now, if the polycistronic genes work together to described ‘an inheritable characteristic’ that means those genes have evolved to work together just for that characteristic, then they can also be multigenic. So it can be confusing in this particular instance.

    • May 7, 2010 at 6:51 pm #99623
      JackBean
      Participant

      so, like lac operon can be multigenic?

      If so, than probably most (if not all) operons (=polycistronic, right?) are multigenic, right?

    • May 8, 2010 at 4:08 pm #99632
      simpleton
      Participant

      it’s really confusing! Orome, i did google but i found different definitions and can’t conclude.

      and in the book, principles of genetic it says that multigenic means that the mRNA contains the coding regions of two or more genes. Then in a lecture note from a Uni, the lecture note wrote polycistronic (multigenic)… in which it implies that the 2 terms are the same.

      it’s really confusing! omg!

    • May 8, 2010 at 4:22 pm #99633
      simpleton
      Participant

      Multigenic
      Description: Many genes are involved in the expression of a trait.
      Source: Specialized encyclopedia and dictionaries

      Polycistronic messages have multiple ORF’s in one transcript and also have small regions of untranslated sequence between each ORF.

      But this multigenic definition (as also mentioned by Orome) is different from my textbook. Hmm.. confusing enough!

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