Published On: Thu, May 5th, 2016

The mystery behind twins



Recently researchers have found two genes that can clarify why a few women are probably to have non-identical twins.

Whereas it is known that if a woman’s female family member have non-identical twins, she is much probable to give birth to twins herself, the genes for this fact have stayed an anonymity.

Dorret Boomsma, the lead researcher and biological psychologist at Vrije Universiteit (VU) Amsterdam in the Netherlands, stated that “There’s an enormous interest in twins, and in why some women have twins while others don’t,”

Boomsma further added that “The question is very simple, and our research shows for the first time that we can identify genetic variants that contribute to this likelihood,”

The results presented in the journal American Journal of Human Genetics.

By these consequences, the team expected to enlarge a genetic analysis to recognize women at peril for this state.

In support of the study, the international team of researchers collected genetic data from twin databases in the Netherlands, Australia, and the US.

The sample collected 1,980 mothers of fraternal (usually recognized as non-identical) twins got pregnant devoid of fertility treatments and 12,953 controls.

The researchers were searching for genetic alternatives, revealed by mothers with twins, which illustrated a diverse frequency from those in the control groups.

When the researchers had recognized a handful of contenders, they provided the findings to partners in Iceland, who chomped the figures on their own set of 3,597 mothers with twins and 297,348 controls.

Two of the gene options were repeated in the Icelandic cohort, seeming much frequently in the mothers with fraternal twins conceived devoid of fertility treatments.

One variant, situated close to a gene named FSHB, is linked with elevated levels of follicle-stimulating hormone (FSH).

This hormone activates follicle development in a woman’s ovaries, ultimately directing to an egg being discharged – and with elevated FSH levels, manifold eggs can be discharged all at once, directing to twins if two get fertilized.

Cornelis Lambalk, who is the gynecologist at VU Medical Centre Amsterdam, stated that the second genetic variant, in a gene named SMAD3 included in cell indicating, almost certainly performs a role in how the ovaries react to FSH.

If a woman generates a standard level of FSH, but her ovaries are much receptive to the hormone, she can yet discharge manifold eggs at a time.

Hamdi Mbarek, who is the initial researcher and geneticist at VU Amsterdam, stated “This genetic variant is totally novel and hadn’t been shown before as a candidate gene for twin,”

About the Author

Sidra Muntaha

- Sidra Tul Muntaha is a journalist (MA-Mass Communication and M.Phil in Mass Communication) based in Lahore. She is working as an editor at fashion, style and entertainment in the section of the Kooza. She writes fashion and entertainment articles for The Kooza News.