Not specifically Paleo, but relevant to our discussions last month of
child health, is UK research reported on the BBC site on Friday:

http://news.bbc.co.uk/1/hi/health/3113531.stm

An extract:

"Our study demonstrates how early environmental factors can alter gene
expression without mutating the gene itself.

The implications for humans are huge because methylation is a common event
in the human genome, and it is clearly a malleable effect that is subject
to subtle changes in utero."

The researchers found evidence of DNA methylation in many different types
of cell throughout the bodies of the baby mice - indicating that the
process was triggered at an early stage of gestation."
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Keith