Athletic frogs `have faster-changing genomes`
Washington: Physical fitness matters in frogs. Those who are athletic have faster-changing genomes, say researchers, after carrying out a study of poison frogs from Central and South America.
Stretches of DNA accumulate changes over time, but the rate at which those changes build up varies considerably between species, said lead author Juan C Santos of National Evolutionary Synthesis Center in North Carolina.
For the study, the researchers scoured forests in Colombia, Ecuador, Venezuela, and Panama in search of poison frogs, subjecting nearly 500 frogs -- representing more than 50 species -- to a frog fitness test.
They had the frogs run in a rotating plastic tube resembling a hamster wheel, and measured their oxygen uptake after four minutes of exercise. The friskiest frogs had aerobic capacities five times higher than the most sluggish species, and were able to run longer before they got tired.
"Physically fit species are more efficient at extracting oxygen from each breath and delivering it to working muscles," Santos said in a release.
To estimate the rate at which each species` genome changed over time, the researchers also reconstructed poison frog family tree, using DNA sequences from fifteen frog genes.
When they estimated the number of mutations, or changes in the DNA, for each species over time, a clear pattern emerged -- athletic frogs tended to have faster-changing genomes, the `Molecular Biology and Evolution` reported.
During exercise, the circulatory system provides blood and oxygen to the tissues that are needed most -- the muscles -- at the expense of less active tissues, Santos said.
More from India
More from World
More from Sports
More from Entertaiment
- DNA: Analysis of Indus water treaty between India and Pakistan
- DNA: US army's joint exercise with Indian Army and their consolation on Uri attack
- India- America joint military exercise begins in Ranikhet
- India to activate laser walls on LOC to stop infiltration
- Panel discussion on 'Most Favoured Nation' status India accorded to Pakistan in 1996
- SETBACK! Sedition case against 200 Congress workers for shouting 'Pakistan Zindabad' slogans during rally for Uri martyrs
- Five takeaways from Sushma Swaraj's speech at UN General Assembly
- Reliance Jio impact: Vodafone offers 10 GB data at 1 GB rate
- 7 scenarios Pak will face directly if India scraps Indus Waters Treaty – Read details
- Rameez Raja picks all-time XI - Three Indians, but just one Pakistani make it to the list