SEP 03, 2019 12:42 PM PDT

Scientists debunk evidence of a single "gay gene"

WRITTEN BY: Carly Boyd

The exact role of genetic involvement is sexuality and sexual preferences have been a very controversial and intriguing topic. Some scientists have been on the search for a singular "gay gene" but a team of scientists lead by Andrea Ganna have found that multiple genes contribute to nonheterosexual behavior.

While there has been evidence that same-sex sexual behavior has a genetic component, such as twins being born with the same sexual orientation, this is the first time that a large-scale study has been done to "identify genetic variants associated with same-sex sexual behavior. For the study, the genomes of 493,001 participants from the U.S., U.K., and Sweden were used to discover any genetic involvement for sexual preference.

The study revealed that specific locations within the genome are associated with homosexual behavior, but not a particular "gay gene" as was popular belief. Ganna et al. "established that the underlying genetic architecture is highly complex; there is certainly no single genetic determinant". The variations in the genome known as SNPs (single-nucleotide polymorphisms) were compared to determine any correlation between them and sexual preference or behavior revealed by the participant. "We identified two genome-wide significant signals for same-sex sexual behavior", Ganna et al. writes. They reveal that by comparing the SNPs and the behavior traits that "same-sex sexual behavior, like most complex human traits, is influenced by the small, additive effects of very many genetic variants". 

This study not only reveals important genetic components, that collectively may contribute the same-sex sexual behavior, but it also provides a crucial reminder that there is no simple conclusion that can be made about anything in science today. It is important to remember this going forward; nature vs. nurture will never be a clear line. 

To see a news report about this study, watch this video below from CBS News.

Source: "Large-scale GWAS reveals insights into the genetic architecture of same-sex sexual behavior" Ganna et al.

About the Author
  • Being a master's student in Cell and Molecular Biology, I'm interested in a variety of topics in biology. Currently, I'm researching ways to identify putative enhancer elements for peripheral nervous system development in the genome of Ciona intestinalis (our closest invertebrate relative).
You May Also Like
JAN 11, 2020
Cell & Molecular Biology
JAN 11, 2020
To Save Others, Bacteria Can Self-Destruct When Infected by a Virus
Scientists were studying viruses that infect and kill bacteria as a medicine for bacterial infections over a hundred years ago, and they are a focus of recent research as well....
JAN 21, 2020
Cell & Molecular Biology
JAN 21, 2020
Repurposing Existing Drugs to Treat Cancer
Drugs have to be rigorously tested before they can be offered to patients, so it can be much easier to find more than one application for a medication....
JAN 28, 2020
Cell & Molecular Biology
JAN 28, 2020
A Rare Genetic Disorder is Effectively Treated With Modified Stem Cells
A clinical trial used stem cell gene therapy to treat a rare genetic disorder called X-CGD. Image credit: UCLA Broad Stem Cell Research Center/Nature Medicine...
FEB 10, 2020
Cell & Molecular Biology
FEB 10, 2020
Lighting a Path to an Alzheimer's Disease Treatment
Alzheimer's impacts millions of people around the world; globally, it is thought to cost $605 billion a year, and there is still no way to treat it....
FEB 20, 2020
Cell & Molecular Biology
FEB 20, 2020
Fresh Insights Into the Inner Membrane of the Mitochondria
Structures called mitochondria are crucial for life; these small powerhouses generate energy for cells. Scientists have now learned more about these ancient organelles....
FEB 26, 2020
Neuroscience
FEB 26, 2020
Immunotherapy Could Be Used to Treat Traumatic Brain Injury
Video:  Further explaination of microglia and their various functions.  Traumatic Brain Injuries are physical injuries to the brain which cause i...
Loading Comments...