Division Identified |
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BERKELEY, CA – A key mechanism in the passing of geneticmaterial from a parent cell to daughter cells appears to have been identified by a team of Berkeley researchers. Their study may explain how a complex of proteins, called kinetochores, can recognize andstay attached to microtubules, hollow fibers in the walls of biological cells that are responsible for the faithful segregation of chromosomes during cell division. | |
(Fromleft), Eva Nogales, Stefan Westermann, David Drubin and Georjana Barnes, scientists with Berkeley Lab and UC Berkeley, have identified a key mechanism in the passing of genetic material from a parent cellto daughter cells. | |
“In test tube experiments, we’ve found that the kinetochore proteins form rings around the microtubules and this ring formation promotes microtubule assembly,stabilizes against disassembly, and promotes bundling,” says Eva Nogales, a biophysicist who holds joint appointments with the Lawrence Berkeley National Laboratory (Berkeley Lab), the University ofCalifornia at Berkeley, and the Howard Hughes Medical Institute (HHMI). “If ring formation takes place in vivo, it could be the mechanism by which chromosomes are kept segregated during mitosis.”Nogales is oneof the co-authors of a paper reporting the results of this research which appears in the January 21, 2005 issue of the journal Molecular Cell. Other authors of the Molecular Cell paper were GeorjanaBarnes, David Drubin and Stefan Westermann, with UC Berkeley's Department of Molecular and Cell Biology, who were the lead investigators on this work, plus Agustin Avila-Sakar and Hong-Wei Wang, withBerkeley Lab, and Hanspeter Niederstrasser and Jonathan Wong with UC Berkeley.Says Barnes, “Mistakes in chromosome segregation during mitosis contribute to cancer and birth defects. From various...