Guest guest Posted May 28, 2009 Report Share Posted May 28, 2009 CMT is associated with a * duplication * on chromosome 17p11.2-12. This chromosome contains an important myelin gene, peripheral myelin protein-22 gene (PMP22). CMT has an * extra copy * of PMP22. HNPP is caused by a * deletion (loss of a copy) * of PMP 22 on the same chromosome where CMT has a duplication. Two copies of a gene are usually needed for normal function. Quote Link to comment Share on other sites More sharing options...
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