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Genes responsible for fainting identified


is not just caused by external factors, according to a recent study, which has identified the first gene that predisposes people to faint.

Heat, and anxiety can cause people to faint which potentially can be fatal if it is happening while driving or cycling.

However, according to the study published in the Journal of Cardiovascular Research, researchers claim to have identified a gene associated with an increased risk of fainting, also called

Researchers from the University of Copenhagen, and Rigshospitalet have based their findings on data from the containing information on approximately 400,000 Britons.

"We have learned that a part of chromosome 2 increases the risk of This means that there is a genetic risk variant that predisposes to In addition, we are the first to show that fainting is genetically determined by linking an increased risk of fainting with an exact position in the genome,' said Associate Professor,

All of us have 23 chromosome pairs or a total of 46 chromosomes in each cell. The genetic variant identified by the researchers is situated on chromosome 2.

A person can have one, two or no risk variants on chromosome 2. Statistical calculations show that if the risk variant is found on both versions of chromosome 2, the person in question has a 30 percent higher risk of fainting compared to persons with none of the two variants.

The researchers have also analysed that women under the age of 35 faint approximately twice as often as men under the age of 35. The cause of it is still unknown.

The common belief is that fainting is caused by a shortage of blood and oxygen to the brain, which results in short-term, total loss of

"This gene probably affects some of the reflexes that determine whether you faint or not. The question is whether the is the same for all types of We believe that the gene we have identified predisposes to vasovagal syncope, which is the most common type of But we still do not know. First, we need to study the gene in detail," said

(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)

First Published: Fri, May 17 2019. 18:40 IST