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Journal Article
Research Support, Non-U.S. Gov't
Synpolydactyly in mice with a targeted deficiency in the HoxD complex.
Nature 1996 November 8
The morphogenesis of mammalian digits requires the function of several genes of the HoxD complex during development of limb buds. Using embryonic stem (ES) cells and a site-specific recombination system (loxP/Cre), we have induced a deficiency that eliminates the products of the Hoxd-13, Hoxd-12 and Hoxd-11 genes simultaneously. A Hoxd-11/lacz reporter gene replaced the deleted region in order to monitor the effect of this triple inactivation at the cellular level. Mice homozygous for this deficiency showed small digit primordia, a disorganized cartilage pattern and impaired skeletal mass. These alterations are similar to the defects seen in a human synpolydactyly, suggesting that this syndrome, which is associated with a subtle mutation in HOXD13 (ref. 8), may involve the loss of function of several Hoxd genes. These results indicate the existence of a functional hierarchy among these genes and provide us with an animal model to study human digit malformations.
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