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 . Mecp2 duplication syndrome occurs when there is an extra copy duplication of genetic material that includes the mecp2 gene the size of the duplication can vary ie additional genes around the mecp2 gene may also be duplicated. 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. 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. The int22h1 int22h2 mediated xq28 duplication syndrome is a recently recognized x linked intellectual disability syndrome characterized in males by cognitive impairment behavioral and psychiatric problems recurrent infections atopic diseases obesity and distinctive facial features
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