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 chromosome. 7q1123 duplication syndrome is a condition that can cause a variety of neurological and behavioral problems as well as other abnormalities people with 7q1123 duplication syndrome typically have delayed development of speech and motor skills such as crawling and walking. Mecp2 duplication syndrome is caused by a genetic abnormality in which a portion of the x chromosome appears two times on one of the x chromosomes duplication instead of once by definition the affected region always contains the methyl cpg binding protein 2 mecp2 gene. Mecp2 duplication syndrome is a severe neurological and developmental disorder signs and symptoms include low muscle tone hypotonia in infancy developmental delay severe intellectual disability and progressive spasticity. 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
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