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Epigenetics and Homosexuality

slo1
Posts: 4,318
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12/11/2012 9:19:45 AM
Posted: 3 years ago
http://www.sciencedaily.com...

Epigenetics -- how gene expression is regulated by temporary switches, called epi-marks -- appears to be a critical and overlooked factor contributing to the long-standing puzzle of why homosexuality occurs.

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.
From an evolutionary standpoint, homosexuality is a trait that would not be expected to develop and persist in the face of Darwinian natural selection. Homosexuality is nevertheless common for men and women in most cultures. Previous studies have shown that homosexuality runs in families, leading most researchers to presume a genetic underpinning of sexual preference. However, no major gene for homosexuality has been found despite numerous studies searching for a genetic connection.

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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.
Sex-specific epi-marks produced in early fetal development protect each sex from the substantial natural variation in testosterone that occurs during later fetal development. Sex-specific epi-marks stop girl fetuses from being masculinized when they experience atypically high testosterone, and vice versa for boy fetuses. Different epi-marks protect different sex-specific traits from being masculinized or feminized -- some affect the genitals, others sexual identity, and yet others affect sexual partner preference. However, when these epi-marks are transmitted across generations from fathers to daughters or mothers to sons, they may cause reversed effects, such as the feminization of some traits in sons, such as sexual preference, and similarly a partial masculinization of daughters.
slo1
Posts: 4,318
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12/11/2012 9:22:38 AM
Posted: 3 years ago
It is so silly that many people think their attraction to the opposite sex is a choice rather than biological function.

If you have been following anything in biology in the past few years, you have to know that there is going to be found biological reasons as to why people are attracted to the gender they are attracted to and it is not as simple a choosing it.

Silly silly people.
Brain_crazy
Posts: 242
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12/11/2012 1:43:22 PM
Posted: 3 years ago
At 12/11/2012 9:22:38 AM, slo1 wrote:
It is so silly that many people think their attraction to the opposite sex is a choice rather than biological function.

If you have been following anything in biology in the past few years, you have to know that there is going to be found biological reasons as to why people are attracted to the gender they are attracted to and it is not as simple a choosing it.

Silly silly people.

Agreed. Unfortunately I've run into even PhD educated individuals who argue against this point. (Former sociology professor) The adversity to biology in sociology is at times scary to say the least.
Wulfyn
Posts: 33
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12/11/2012 3:00:11 PM
Posted: 3 years ago
I also agree, and would like to add that I don't think that it is even a gender specific thing because you can't control who you are attracted to even of the opposite gender. This is why I find it so hard to understand people who say it is a choice - if you are a straight male you cannot decide whether you find a particular woman attractive or not.
AlwaysMoreThanYou
Posts: 2,900
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12/12/2012 4:50:32 AM
Posted: 3 years ago
Why do I feel like I've seen a topic with the exact same title?
'When the Spirit of truth comes, he will guide you into all the truth; for he will not speak on his own authority, but whatever he hears he will speak, and he will declare to you the things that are to come.' - John 16:13
slo1
Posts: 4,318
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12/12/2012 8:08:37 AM
Posted: 3 years ago
At 12/12/2012 4:50:32 AM, AlwaysMoreThanYou wrote:
Why do I feel like I've seen a topic with the exact same title?

Is this a trick question?
AlwaysMoreThanYou
Posts: 2,900
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12/12/2012 2:14:45 PM
Posted: 3 years ago
At 12/12/2012 8:08:37 AM, slo1 wrote:
At 12/12/2012 4:50:32 AM, AlwaysMoreThanYou wrote:
Why do I feel like I've seen a topic with the exact same title?

Is this a trick question?

It wasn't the exact same title. Pretty close, though.
'When the Spirit of truth comes, he will guide you into all the truth; for he will not speak on his own authority, but whatever he hears he will speak, and he will declare to you the things that are to come.' - John 16:13
slo1
Posts: 4,318
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12/12/2012 3:39:13 PM
Posted: 3 years ago
At 12/12/2012 2:14:45 PM, AlwaysMoreThanYou wrote:
At 12/12/2012 8:08:37 AM, slo1 wrote:
At 12/12/2012 4:50:32 AM, AlwaysMoreThanYou wrote:
Why do I feel like I've seen a topic with the exact same title?

Is this a trick question?

It wasn't the exact same title. Pretty close, though.

I see now, although, I put in science as to avoid the resulting morality debate, which the science of it can not resolve.
PARADIGM_L0ST
Posts: 6,958
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12/12/2012 4:04:04 PM
Posted: 3 years ago
Fascinating article. I think researchers might finally be on the right track. But until we can know for sure, lets just keep blaming it on sin and the ever-convenient Satan.
"Have you ever considered suicide? If not, please do." -- Mouthwash (to Inferno)
Df0512
Posts: 966
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12/13/2012 9:22:07 AM
Posted: 3 years ago
At 12/11/2012 9:22:38 AM, slo1 wrote:
It is so silly that many people think their attraction to the opposite sex is a choice rather than biological function.

If you have been following anything in biology in the past few years, you have to know that there is going to be found biological reasons as to why people are attracted to the gender they are attracted to and it is not as simple a choosing it.

Silly silly people.

I agree as well. I mean we have people born into this world with much more dramatic mutations. People being born gay is, no offensive to gay people, a little unimpressive.