According to the study, published online today in The Quarterly Review of Biology, sex-specific epi-marks, which normally do not pass between generations and are thus "erased," can lead to homosexuality when they escape erasure and are transmitted from father to daughter or mother to son.
Epi-marks constitute an extra layer of information attached to our genes' backbones that regulates their expression. While genes hold the instructions, epi-marks direct how those instructions are carried out -- when, where and how much a gene is expressed during development. Epi-marks are usually produced anew each generation, but recent evidence demonstrates that they sometimes carry over between generations and thus can contribute to similarity among relatives, resembling the effect of shared genes.
The study solves the evolutionary riddle of homosexuality, finding that "sexually antagonistic" epi-marks, which normally protect parents from natural variation in sex hormone levels during fetal development, sometimes carryover across generations and cause homosexuality in opposite-sex offspring. The mathematical modeling demonstrates that genes coding for these epi-marks can easily spread in the population because they always increase the fitness of the parent but only rarely escape erasure and reduce fitness in offspring.
Originally posted by Wertdagf
reply to post by Quadrivium
It states that these things are skipping several generations....
If it was genetic and was skipping generations with the same genes.... im interested to see their evidence beyond what 2 people think is "most plausable".
If they know whats causing this then their should be a genetic test. That should be pretty defninitive.edit on 12-12-2012 by Wertdagf because: (no reason given)
Originally posted by solargeddon
Now this doesn't surprise me at all.
All those little appendages wreaking all sorts of havoc, now could be repsonsible for homosexuality.
We are only just beginning to understand the widespread effect of epigenes, but one thing to note, the expression of a gene can be influenced by environmental factors as well.
So my question would be, can it not be present, and swtich on/off.
I know of many people who began straight, but later on became attracted to the same sex.
Plus, what does this mean for bi-sexuals ?
Originally posted by grey580
reply to post by AfterInfinity
This is true.
But now we can look at the crazies and tell them... being gay is really not a choice.
You're born that way.
"The genes for homosexuality have not been identified yet despite a very significant effort," said Sergey Gavrilets, a professor in UT's National Institute for Mathematical and Biological Synthesis.
"When you put it together in one very coherent framework, (the theory) is very logical and is supported by mathematical modeling. It is an explanation that seems to be working much better than any existing explanations."
The model Gavrilets and his collaborators developed still needs to be tested with experiments looking for these triggers in DNA, he said.
Originally posted by dorkfish87
You can't cure homosexuality because it isn't a disease. I don't know if this study will pan out or not, nor do I really care as a gay man.
I know I didn't decide to be gay, I know I was either born this way or became as such long before I can remember. What actually caused it is of no concern to me, honestly. You cannot fix that which isn't broken.
Originally posted by rickymouse
Epigenetics and nutrigenomics are related. The reason that people may be gay in the first place is because of changes in diet both of the mother during conception and the child after birth. We have altered the diet of society too much too quick.