Genes for Leukaemia, Obesity, Bowel Disease Identified

Genetic flaws that separately boost the risk of a common form of leukaemia and bowel disease in children and may also influence obesity and fertility have been identified by a group of researchers.

The work is reported in three different studies, published by the journals Nature Genetics and Nature Medicine.

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Encyclopedia section of medindia gives general information about Leukemia

A team led by Richard Houlston of Britain's Institute of Cancer Research found six genetic variants that increase vulnerability to chronic lymphocytic leukaemia (CLL), which accounts for roughly a quarter of all leukaemia cases.

The variants occur in genes that play a role in the proliferation of so-called B cells, a type of white blood produced in the bone marrow.

Individually, these variants each contribute to a modest increase in the risk of CLL, but a person with all six faces an eight-fold increase.

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Acute lymphoblastic leukemia (ALL) is the cancer of white blood cells characterized by excess lymphoblasts. It is the most common of all childhood cancers and can be fatal in weeks if left untreated.

Meanwhile, investigators in the United States found that a gene switched on by leptin -- a hormone that tells the brain when the body has sufficient nutrition -- is involved in appetite disorder and infertility.

The discovery was found in the brain of mice, but there are likely to be strong similarities in humans, the authors said.

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Acute myeloid Leukemia, more popularly known by its abbreviated form AML, is a fast- evolving leukemia that affects both children and adults alike

"This gene is crucial to the daisy chain of signals that run between body fat and brain," lead researcher Marc Montminy of the Clayton Foundation Laboratories for Peptide Biology, said in a press release.

"It likely plays a pivotal role in how much we, as humans, eat and whether we have offspring."

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Animation and slides providing graphic explanation of Bone Marrow Transplantation (BMT)/Stem Cell Transplantation that is done for leukemia and other blood-related disorders.

Variations of the gene, called TORC1, could play a part in obesity and infertility, as they could send the wrong signals to the brain as to whether food is needed and whether the body has sufficient energy stores for reproduction.

A third study, entailing a trawl through the genetic code of thousands of people, netted two new genes involved in childhood inflammatory bowel disease (IBD), a painful condition that includes Crohn's disease and ulcerative colitis.

Genomics -- as genetic analysis is called -- is one of the most eagerly explored frontiers of medicine today.

Finding genes that cause or amplify a disease opens up pathways for diagnostic tools to help identify people at risk from the ailment.

It also, more distantly, opens up avenues for potential drugs to block or reverse the gene's malfunction.

Source-AFP
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