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    Home > Biochemistry News > Biotechnology News > Chromosomal terminal short salmon cubs have a higher survival rate during migration.

    Chromosomal terminal short salmon cubs have a higher survival rate during migration.

    • Last Update: 2020-08-28
    • Source: Internet
    • Author: User
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    Something unusual is happening.
    Young Atlantic salmon with shorter chromosome terminals are generally considered to be in poor health, but they are more likely to survive the epic migration from their home country's Mother River to the ocean and back again.
    function like a "hat" at the end of a chromosome, protecting DNA after cell division.
    but each split makes the chromosome terminal shorter, and eventually it becomes so short that the cells cannot divide again.
    , shorter chromosomal terminals are associated with cardiovascular disease and cancer in adults and are thought to reflect overall cellular aging and health status.
    is why Darryl McLennan and colleagues at the University of Glasgow in the UK are perplexed by this conclusion.
    spring 2013, McLennan's team tagged more than 1,800 young salmon in the Blackwater River in northern Scotland, or small salmon that had first entered the sea from the river, before migrating to the sea.
    team also took fin samples of each small salmon to measure its chromosomal terminal.
    in 2014 and fall 2015, McLennan looked forward to the salmon returning from the ocean to spawn in the river, tracking tagged fish and again collecting fin tissue samples to measure the length of the mitochondrial terminal.
    only 21 of the original salmon survived, and the survivors were significantly shorter mitochondrial terminals when they began their migration.
    we started this study, we assumed that young salmon with shorter chromosome terminals had a shorter life span, but found the opposite."
    ," McLennan said.
    this is an unexpected result, but Terry Burke, of the University of Sheffield, points out that the final analysis relies on only a very small amount of data on the original salmon: about 1 per cent of the initial number.
    hopes to conduct repetitive studies before making people believe that salmon with shorter chromosome terminals migrate longer than their peers.
    but Kjetil Hindar of the Norwegian Institute of Nature is not worried about the survival rate of the area.
    he says the current return rate for Norwegian salmon is the same.
    ", salmon are now much less likely to survive in the ocean than they were 30 years ago.
    the 1980s, the return rate was twice as high as it is now.
    " migration salmon is not easy.
    they are one of the most studied fish species in the world, little is known about what happens to salmon in the ocean.
    eventually, the predation of seabirds and large marine fish, as well as higher-intensity fishing, means that very few salmon can return to their freshwater river birthplaces.
    McLennan has his own view of why salmon with shorter chromosome terminals can swim farther, arguing that salmon produce physiological changes as they prepare to migrate and enter the marine environment from fresh water, such as changing their gills to accommodate higher salinity.
    McLennan believes that salmon that need more energy for ocean life will do so at the expense of maintaining the length of their chromosomes.
    , unlike humans, fish are able to repair their chromosome terminals.
    regardless of the final findings, McLennan said the study shows that people need to better understand the role of chromosome terminals in aging and cell health.
    .
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