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White > Locus I and C

Discussion in 'General breed discussions & FAQ' started by bantamF, Apr 26, 2009.

  1. bantamF

    bantamF Out Of The Brooder

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    Apr 25, 2009
    France
    Hello,

    What's the link ???
     
  2. klf73

    klf73 Mad Scientist

    Jun 1, 2008
    Maine
  3. bantamF

    bantamF Out Of The Brooder

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    Apr 25, 2009
    France
    Thanks, y know this website !!!

    Do you think the best white is E/E, c/c, S/S ??
     
  4. tadkerson

    tadkerson Chillin' With My Peeps

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    Jul 19, 2008
    Missouri
    There is no linkage between the I locus and the C locus. Both can produce a white chicken. They work in different ways on the cell level. The dominant white locus (I) does not allow for the production of eumelanosomes ( little structures in a cell that hold black pigment) but do produce phaeomelanosomes ( little structures in a cell that hold red pigment). The follicle cells of a dominant white chicken do not have the structures that hold the black pigment therefore the black pigment can not be produced in the follicle and placed into a feather. The black pigment has to be made inside the melanosomes.

    The recessive color allele c+ is effective at inhibiting all color ( almost all of the time) while the I allele is only affective at inhibiting black pigment (most of the time). The recessive white allele is a mutation of the color allele (C). The recessive white allele contains a virus insertion which disrupts the molecular structure of the gene. Ultimately this incorrect molecular structure does not allow for the correct molecular structure ( shape) of the tyrosinase enzyme. If the tyrosinase enzyme is not the correct shape it can not help make pigments. The tyrosinase enzyme is needed in the first two biochemical reactions that produce pigments. If the first two reactions do not occur, then no pigment is produced.

    Tim
     
    Last edited: Apr 26, 2009
  5. Sonoran Silkies

    Sonoran Silkies Flock Mistress

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    Jan 4, 2009
    Tempe, Arizona
    WOW! Thanks. In many cases I know WHAT a gene does, but HOW it works is usually something to which I haven't been exposed. Now I need to copy and re-read a few dozen times and figure out any questions to learn more... [​IMG]
     
  6. bantamF

    bantamF Out Of The Brooder

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    Apr 25, 2009
    France
    Whoaouu!!!

    Thanks !! and S ??? ....[​IMG][​IMG][​IMG]
     
  7. Kev

    Kev Overrun With Chickens

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    Jan 13, 2008
    Sun City, California
    Awesome information, Tim. c white being due to a virus insertion is "way cool".
     
  8. Krys109uk

    Krys109uk Chillin' With My Peeps

    Nice explanation....thanks. [​IMG]
     

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