Friday, February 03, 2006
Wanted: Evolution of a Polyphenism by Genetic Accommodation (Science)
[Suzuki & Nijhout, Science, Feb '06]
Abstract:
Polyphenisms are adaptations in which a genome is associated with discrete alternative phenotypes in different environments. Little is known about the mechanism by which polyphenisms originate. We show that a mutation in the juvenile hormone-regulatory pathway in Manduca sexta enables heat stress to reveal a hidden reaction norm of larval coloration. Selection for increased color change in response to heat stress resulted in the evolution of a larval color polyphenism and a corresponding change in hormonal titers through genetic accommodation. Evidently, mechanisms that regulate developmental hormones can mask genetic variation and act as evolutionary capacitors, facilitating the origin of novel adaptive phenotypes.
http://www.sciencemag.org/cgi/content/abstract/311/5761/650
John
Model of an Internal Evolutionary Mechanism
http://members.aol.com/jorolat/index.html
UPDATE: Reprints can be requested from Yuichiro Suzuki's email address here
Abstract:
Polyphenisms are adaptations in which a genome is associated with discrete alternative phenotypes in different environments. Little is known about the mechanism by which polyphenisms originate. We show that a mutation in the juvenile hormone-regulatory pathway in Manduca sexta enables heat stress to reveal a hidden reaction norm of larval coloration. Selection for increased color change in response to heat stress resulted in the evolution of a larval color polyphenism and a corresponding change in hormonal titers through genetic accommodation. Evidently, mechanisms that regulate developmental hormones can mask genetic variation and act as evolutionary capacitors, facilitating the origin of novel adaptive phenotypes.
http://www.sciencemag.org/cgi/content/abstract/311/5761/650
John
Model of an Internal Evolutionary Mechanism
http://members.aol.com/jorolat/index.html
UPDATE: Reprints can be requested from Yuichiro Suzuki's email address here
Add to: CiteUlike | Connotea | Del.icio.us | Digg | Furl | Newsvine | Reddit | Yahoo
Comments:
<< 'Wanted Papers' Home
I've heard from Yuichiro Suzuki (who is one of the authors of "Evolution of a Polyphenism by Genetic Accommodation") and anyone else who would like a reprint can contact him at the email address given here:
http://www.sciencemag.org/cgi/content/abstract/311/5761/650
Post a Comment
http://www.sciencemag.org/cgi/content/abstract/311/5761/650
<< 'Wanted Papers' Home
