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Toxic masculinity: Y chromosome contributes to a shorter lifespan in male flies

DNA repeats on the Y chromosome become more active and toxic as male flies age

Date:
April 22, 2021
Source:
PLOS
Summary:
Males may have shorter lifespans than females due to repetitive sections of the Y chromosome that create toxic effects as males get older, according to a new study in fruit flies.
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Males may have shorter lifespans than females due to repetitive sections of the Y chromosome that create toxic effects as males get older. These new findings appear in a study by Doris Bachtrog of the University of California, Berkeley published April 22 in PLOS Genetics.

In humans and other species with XY sex chromosomes, females often live longer than males. One possible explanation for this disparity may be repetitive sequences within the genome. While both males and females carry these repeat sequences, scientists have suspected that the large number of repeats on the Y chromosome may create a "toxic y effect" that shortens males' lives. To test this idea, Bachtrog studied male fruit flies from the species Drosophila miranda, which have about twice as much repetitive DNA as females and a shorter lifespan. They showed that when the DNA is in its tightly packed form inside the cells of young male flies, the repeat sections are turned off. But as the flies age, the DNA assumes a looser form that can activate the repeat sections, resulting in toxic side effects.

The new study demonstrates that Y chromosomes that are rich in repeats are a genomic liability for males. The findings also support a more general link between repeat DNA and aging, which currently, is poorly understood. Previous studies in fruit flies have shown that when repeat sections become active, they impair memory, shorten the lifespan and cause DNA damage. This damage likely contributes to aging's physiological effects, but more research will be needed to uncover the mechanisms underlying repeat DNA's toxic effects.


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Journal Reference:

  1. Alison H. Nguyen, Doris Bachtrog. Toxic Y chromosome: Increased repeat expression and age-associated heterochromatin loss in male Drosophila with a young Y chromosome. PLOS Genetics, 2021; 17 (4): e1009438 DOI: 10.1371/journal.pgen.1009438

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PLOS. "Toxic masculinity: Y chromosome contributes to a shorter lifespan in male flies." ScienceDaily. ScienceDaily, 22 April 2021. <www.sciencedaily.com/releases/2021/04/210422150405.htm>.
PLOS. (2021, April 22). Toxic masculinity: Y chromosome contributes to a shorter lifespan in male flies. ScienceDaily. Retrieved June 16, 2024 from www.sciencedaily.com/releases/2021/04/210422150405.htm
PLOS. "Toxic masculinity: Y chromosome contributes to a shorter lifespan in male flies." ScienceDaily. www.sciencedaily.com/releases/2021/04/210422150405.htm (accessed June 16, 2024).

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