Junk DNA: goodbye!: An RNA controls chromosome number (Introduction)

by David Turell , Friday, December 25, 2015, 00:18 (3045 days ago) @ David Turell

A non-coding RNA has been found to control chromosome number in dividing cells:-http://medicalxpress.com/news/2015-12-scientists-role-rna-safeguarding-human.html-
"Molecular biologists at UT Southwestern Medical Center have identified a gene called NORAD that helps maintain the proper number of chromosomes in cells, and that when inactivated, causes the number of chromosomes in a cell to become unstable, a key feature of cancer cells. -"Previously, genes that encode the recipe for making proteins have been implicated in maintaining the proper number of chromosomes in a cell. The NORAD gene, however, does not encode a protein. Instead, NORAD produces a long noncoding RNA, a type of molecule that was not previously known to be important in chromosome maintenance, the researchers report in the journal Cell.-"In the absence of the NORAD RNA, the number of chromosomes in cells becomes highly abnormal," explained Dr. Joshua Mendell, Professor of Molecular Biology at UT Southwestern and a Howard Hughes Medical Institute Investigator. "This is an entirely new function for a noncoding RNA and may have implications in cancer biology since genomic instability is a hallmark of tumor cells."-"Researchers began studying this particular molecule because the RNA kicks into action after DNA is damaged; they therefore termed it Noncoding RNA Activated by DNA Damage, or NORAD.-"The scientists unexpectedly found that NORAD plays a critical role in keeping the genome stable, and conducted experiments showing that when NORAD is absent, cells frequently lose or gain whole chromosomes. Microscopic imaging revealed that cells lacking NORAD are unable to properly pass on chromosomes as they divide. NORAD controls chromosome segregation during cell division by regulating the activity of a family of proteins called PUMILIO proteins. In cells lacking NORAD, overactivity of PUMILIO leads to an unstable genome. Since most cancer cells also exhibit genomic instability, Dr. Mendell and his team are now exploring whether abnormal function of NORAD or PUMILIO proteins contribute to human tumors."-Comment: Junk DNA keeps disappearing. Darwinist scientists have used 'junk' to claim that evolution is a random process which produces junk DNA that is left in place.