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science news

发表日期: 2014-02-17    浏览数: 2834

Science
Vol. 343 no. 6172 pp. 725-727
DOI: 10.1126/science.343.6172.725
  • News Focus

Strength in Numbers?

Summary

Most mammalian cells carry two sets of chromosomes, but a few types of cells—including the mainstays of the liver and heart—have additional chromosome sets, a condition known as polyploidy. The advantage of polyploidy for mammalian cells has been unclear. But by tinkering with cells' chromosome endowments, researchers are testing polyploidy's possible advantages. Polyploidy might aid some cells by boosting their size. And in the liver, polyploidy might spur regeneration by creating genetic diversity among cells. Researchers are also working to test whether inducing polyploidy in certain cells can combat a deadly type of leukemia.