RT Journal A1 Hampton T T1 TUmors and telomeres JF JAMA JO JAMA YR 2011 FD August 3 VO 306 IS 5 SP 480 OP 480 DO 10.1001/jama.2011.1087 UL http://dx.doi.org/10.1001/jama.2011.1087 AB In many cancers, an increased level of the enzyme telomerase helps keep telomeres intact, which helps cancer cells divide without normal limits. Investigators at the Johns Hopkins Medical Institutions in Baltimore found that inactivating mutations in the genes ATRX and DAXX may destabilize chromosomes' protective tips, but they also initiate a mechanism called alternative lengthening of telomeres (ALT) that allows tumor cells to maintain telomere length independent of telomerase.