Tumour Suppressor Mutations Alone Cannot Explain Deadly Cancer
Source: www.domain-b.comAuthor: Staff Although mutations in a gene dubbed ''the guardian of the genome'' are widely recognized as being associated with more aggressive forms of cancer, researchers at the University of California, San Diego School of Medicine, have found evidence suggesting that the deleterious health effects of the mutated gene may in large part be due to other genetic abnormalities, at least in squamous cell head and neck cancers. The study, published online 3 August in the journal Nature Genetics, shows that high mortality rates among head and neck cancer patients tend to occur only when mutations in the tumour suppressor gene coincide with missing segments of genetic material on the cancer genome's third chromosome. The link between the two had not been observed before because the mutations co-occur in about 70 per cent of head and neck tumours and because full genetic fingerprints of large numbers of cancer tumours have become available only recently. ''These two genetic malfunctions are not two separate stab wounds to the body,'' says co-senior author Trey Ideker, PhD, chief of the division of genetics. ''One exposes the Achilles tendon and the other is a direct blow to it.'' To patients with these cancers, the study's results mean that there may be therapeutic value in testing tumours for the two genetic identifiers, known as a TP53 mutation (short for tumour protein 53) and a 3p deletion (short for deletions of genetic information on the short arm ''p'' of the third chromosome). TP53 plays a key role in [...]