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Subject: Re: [working-gundog] epigenetics

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cwalt

MH
Posts:180

07/13/2007 11:16 AM
> Most of what I've found so far happens (perhaps) early in fetal > development so > propagation into germ cells is probably by standard cell differentiation > processes. > jere ~~~~~~~~ I can readily understand the transmission of epigenetic effects in bacteria and protozoans since they divide to reproduce and also they exchange DNA. I can understand epigenetic transmission in plants that propagate by runners, cuttings and other forms of cloning. I run into a mental block when it comes to most sexually reproducing organisms. Of course parthenogenesis could transfer epigenetic effects but the formation of unique reproductive cells from specific tissues early in mammalian life doesn't seem to favor any mechanism that could pass on epigenetic changes to the semi-mature or adult animal. (I will admit that teen age human males have a direct linkage between the brain and reproductive organs but it's primarily a nervous one in which the testes control the brain... there's no evidence of transmission of anything from the brain to the gonads.) Cj

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