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"Researchers at the Sainte-Justine University Hospital Center and the University of Montreal have found a possible heredity mechanism that predisposes children to acute lymphoblastic leukemia (ALL), the most common type of blood cancer in children. According to their findings published in Genome Research, the presence of a genetic defect in the egg or sperm from which children having ALL arise may be a prerequisite for the disease to develop. A significant number of children with ALL are thought to inherit a rare PRDM9 gene variant responsible for the abnormal sex cells\u2013a gene variant that puts their own children at risk of having ALL-predisposed offspring."^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2012-12-genetic-defect-sex-cells-predispose.html>