Mecp2 duplication syndrome is caused by a genetic change in which there is an extra copy of the mecp2 gene in each cell this extra copy of the mecp2 gene is caused by a duplication of genetic material on the long q arm of the x chromosomethe size of the duplication varies from 100000 to a few million dna building blocks base pairs the mecp2 gene is always included in this duplication . What is dup15q syndrome chromosome 15q112 131 duplication syndrome dup15q syndrome is a clinically identifiable syndrome which results from duplications of chromosome 15q112 131 these duplications most commonly occur in one of two forms. A collection of disease information resources and questions answered by our genetic and rare diseases information specialists for chromosome 1q211 duplication syndrome. General discussion summary mecp2 duplication syndrome is a rare genetic neurodevelopmental disorder characterized by a wide variety of symptoms including low muscle tone hypotonia potentially severe intellectual disability developmental delays recurrent respiratory infections speech abnormalities seizures and progressive spasticity a condition characterized by muscle stiffness that . 1q211 duplication syndrome or 1q211 recurrent microduplication is a rare aberration of chromosome 1 in a common situation a human cell has one pair of identical chromosomes on chromosome 1 with the 1q211 duplication syndrome one chromosome of the pair is over complete because a part of the sequence of the chromosome is duplicated twice or more
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