...Bases...

[phasianidae]

Quote:
I think ebc is a rather hypothetical locus. It was supposed to exist in the Buttercup breed, however, it now seems that it is the same as eb.

The following text was taken from this link: http://edelras.nl/chickengenetics/mutations1.html

The following is direct quote from Dr Okimoto on the DNA sequencing of E locus allele from the Silician Buttercup breed, by Leif Anderson. This indicates that the Buttercup pattern may be produced with the eb allele in combination with other modifying genes, and that the ebc allele had not been sequenced.

Dr Ron Okimoto (quote from The Classroom @ The Coop) ......." Leif Andersen has sequenced the buttercup allele (ebc) and it is the identical sequence to the eb alleles that I've sequenced in Partridge Rocks and the Smyth Brown line. If there is a difference between the alleles it is in the regulation of the gene and not in the coding sequence. There may be linked genes that affect the expression of the E locus too."

 

[Ducks and Banny hens]

Quote:
I think ebc is a rather hypothetical locus. It was supposed to exist in the Buttercup breed, however, it now seems that it is the same as eb.

The following text was taken from this link: http://edelras.nl/chickengenetics/mutations1.html

The following is direct quote from Dr Okimoto on the DNA sequencing of E locus allele from the Silician Buttercup breed, by Leif Anderson. This indicates that the Buttercup pattern may be produced with the eb allele in combination with other modifying genes, and that the ebc allele had not been sequenced.

Dr Ron Okimoto (quote from The Classroom @ The Coop) ......." Leif Andersen has sequenced the buttercup allele (ebc) and it is the identical sequence to the eb alleles that I've sequenced in Partridge Rocks and the Smyth Brown line. If there is a difference between the alleles it is in the regulation of the gene and not in the coding sequence. There may be linked genes that affect the expression of the E locus too."

Yes all of that's true, but ebc is thought to exist because of it's several spontaneous occurences in purebred e+ stock, as a genetic mutation. Many find it unlikely that 3 mutations occured spontaneously in the exact same way like that.

 

[Henk69]

Quote:
Never heard of those!

 

[Ducks and Banny hens]

Quote:
Never heard of those!

Henk, good, I was waiting for you. You'll know what this is.

Like I said before, these are unoficial...

e^wh+ is the wildtype reccessive wheaten mentioned before.

E^MB is a 'base' (or polygenic effect) that occurs in the bergische fowl. And I happen to have a rooster with it, too. Look it up on feathersite. Let me know what you think.

 

[tadkerson]

Quote:
Never heard of those!

Henk, good, I was waiting for you. You'll know what this is.

Like I said before, these are unoficial...

e^wh+ is the wildtype reccessive wheaten mentioned before.

]e^wh+ is a 'base' (or polygenic effect) that occurs in the bergische fowl. And I happen to have a rooster with it, too. Look it up on feathersite. Let me know what you think.

I have never read any literature on the e^wh+ or E^MB. Queen Silvia has been mentioned but I do not believe anyone in the USA has worked with the allele. I have seen nothing in the literature from Europe.

Just for some clarification- there can only be one wild type allele at the E locus. All other alleles will be a mutation of the wild type allele or a mutation of a mutation.


Genes are not the only color controlling factors found in animals. There are promoters, inhibitors, switches, enhancers and other pieces of DNA that control transcription- then there are controlling factors that effect how the introns are put together to make the final messenger RNA that will be translated. There are mechanisms for controlling messenger RNA degradation. It is all very complicated and drives me crazy.

I guess what I am trying to say is that two birds can have the same E locus allele, but there are other factors that can effect the production of pigments. Having two alleles that sequence the same ( ebc vs eb) does not always mean the ebc and eb birds will look the same, the promoter region of the two genes may be different. If the promotor region is different then you get a different expression by the alleles. For example, one may cause more black stippling ( in females) than the other etc.

Some other factor that is controlling pigment production may be found in one bird and not the other. So the expression of the E locus allele is dependent upon the E locus allele and other factors. Scientists at one time thought that the DNA that was not a gene was junk but the science world is discovering that the junk DNA is not actually junk.

A good example is found in dogs. Dogs contain sections of DNA called repeating tandems. Sections of DNA that repeat themselves over and over. Researchers have discovered that different breeds of dogs contain mechanisms that put the repeating tandems together in different ways to produce different characteristics in dogs.


Just for the record the brown gene was once called the partridge gene. I can not remember who changed the genotype from ep to eb and I am too lazy to look it up.

Tim

 

[nicalandia]

Quote:
they are probably one and the same, basicaly recessive wheaten found on Red Jungle Fowl..

 

[Ducks and Banny hens]

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That was probably changed to make room for the partridge confusion (American Partridge {eb; Pg; cha} English Partridge {e+} pekin-type partidge {eb; Pg; Db}) Maybe 'there was no room for a partridge base'. But that's just a guess. (note: I'm not sure if those are the right genomes; I'm opperating from memory.)

 

[tadkerson]

Quote:
they are probably one and the same, basicaly recessive wheaten found on Red Jungle Fowl..

http://i1085.photobucket.com/albums/j437/nicalandia/Morejohn1953.jpg

If I remember correctly, the recessive wheaten was named after the yellow down associated with the mutation in the red jungle fowl. It was Morejohn who came up with the genotype. Kimball briefly talks about the mutation.

I agree with you all wheatens are most likely caused by the wheaten allele but the wheaten gene is subject to the things I discussed in a previous post.

Tim

 

[Ducks and Banny hens]

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Nobody knows what this one is?

 

[phasianidae]

Quote:
Nobody knows what this one is?

I have never heard of it. The mottled black I am familiar with (like the color of a Mottled Java) would be ether a E or ER at the E-locus with the mottling gene.

Where did you find out about it?

Ryan