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MUHC and McGill scientists identify gene for debilitating vitamin B12 disease

Scientists at the MUHC and McGill University have identified a gene responsible for a disease that impairs the body's ability to handle vitamin B12 and that may contribute to heart disease, stroke and dementia. The details of the CIHR and March of Dimes funded research are published in this week's issue of Nature Genetics. The research, which began more than 20 years ago, will allow doctors to perform earlier diagnosis, assess 'carriers' of the disease--Combined Methylmalonic aciduria (MMA) and Homocystinuria--and open the door to new and improved treatments for this debilitating disease.

"Although this disease sometimes starts in adolescence or adulthood, we usually diagnose this rare inability to process vitamin B12 in the first few months of life," says Dr. David Rosenblatt, Chairman of Human Genetics at McGill, Director of Medical Genetics in Medicine at the MUHC, Chief of Medical Genetics at the Jewish General Hospital and lead researcher of the new study. "Babies may have breathing, feeding, visual and developmental difficulties, older patients may develop sudden neurological disease."

Vitamin B12, which is found in all animal products--including dairy, eggs, meat, poultry, and fish--but not in plants, is vital for synthesis of red blood cells and maintenance of the nervous system. Vitamin B12 also helps control homocysteine levels in the human body. Homocysteine control is important because in excess this compound can increase the risk of heart disease, stroke, and dementia.

17 year-old Michael--a typical MMA and Homocystinuria patient--was diagnosed at 6-months of age, and has battled numerous medical challenges as a result of his condition. Michael is developmentally delayed, visually impaired and does not talk; he has suffered seizures since he was three years old, had a stroke by the age of seven and has since developed rheumatoid arthritis and scoliosis. Michael's diagnosis, which led the way to treatment involving injections o
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Contact: Ian Popple
ian.popple@muhc.mcgill.ca
514-843-1560
McGill University
30-Nov-2005


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