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May
2017

Gene-editing technologies have made it feasible to create nonhuman primate models for human genetic disorders. Here, we report detailed genotypes and phenotypes of TALEN-edited MECP2 mutant cynomolgus monkeys serving as a model for a neurodevelopmental disorder, Rett syndrome (RTT), which is caused by loss-of-function mutations in the human MECP2 gene. Male mutant monkeys were embryonic lethal, reiterating that RTT is a disease of females.
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http://www.cell.com/cell/pdf/S0092-8674(17)30489-0.pdf
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http://www.cell.com/cms/attachment/2094370742/2077138250/mmc
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http://linkinghub.elsevier.com/retrieve/pii/S009286741730489
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5540256PMCFound


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Rett syndrome (RTT, MIM 312750) is a rare and orphan progressive neurodevelopmental disorder affecting girls almost exclusively, with a frequency of 1/15,000 live births of girls. The disease is characterized by a period of 6 to 18 months of apparently normal neurodevelopment, followed by early neurological regression, with a progressive loss of acquired cognitive, social, and motor skills. RTT is known to be caused in 95% of the cases by sporadic de novo loss-of-function mutations in the X-linked methyl-CpG-binding protein 2 (MECP2) gene encoding methyl-CpG binding protein 2 (MeCP2), a nuclear protein able to regulate gene expression.

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Dec
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Methyl-CpG-binding protein 2 (Mecp2) is an X-linked gene encoding a methylated DNA-binding nuclear protein which regulates transcriptional activity. The mutation of MECP2 in humans is associated with Rett syndrome (RTT), a neurodevelopmental disorder. Patients with RTT frequently show abnormal sleep patterns and sleep-associated problems, in addition to autistic symptoms, raising the possibility of circadian clock dysfunction in RTT.

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Oct
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Rett syndrome (RTT) is a regressive developmental disorder characterized by motor and breathing abnormalities, anxiety, cognitive dysfunction and seizures. Approximately 95% of RTT cases are caused by more than 200 different mutations in the X-linked gene encoding methyl-CpG-binding protein 2 (MeCP2). While numerous transgenic mice have been created modeling common mutations in MeCP2, the behavioral phenotype of many of these male and, especially, female mutant mice has not been well characterized.

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Jun
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Rett syndrome (RTT) is a neurodevelopmental autism spectrum disorder that affects girls due primarily to mutations in the gene encoding methyl-CpG binding protein 2 (MECP2). The majority of RTT patients carry missense and nonsense mutations leading to a hypomorphic MECP2, while null mutations leading to the complete absence of a functional protein are rare. MECP2 is an X-linked gene subject to random X-chromosome inactivation resulting in mosaic expression of mutant MECP2.

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