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Related Experiment Videos

[FRAXE mental retardation].

T Yamagata1

  • 1Department of Pediatrics, Jichi Medical School.

Nihon Rinsho. Japanese Journal of Clinical Medicine
|May 1, 1999
PubMed
Summary
This summary is machine-generated.

FRAXE mental retardation is caused by an expanded GCC triplet repeat in the FMR2 gene, leading to gene inactivation. This expansion results in mild intellectual disability and autistic symptoms in affected individuals.

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No to hattatsu = Brain and development·2013

Area of Science:

  • Genetics
  • Neuroscience
  • Molecular Biology

Context:

  • The folate-sensitive fragile site FRAXE is located in Xq28, near the FRAXA site.
  • FRAXE is associated with the FMR2 gene and characterized by an unstable GCC triplet repeat in its 5' untranslated region.

Purpose:

  • To describe the genetic basis and molecular mechanisms of FRAXE mental retardation.
  • To elucidate the role of the FMR2 gene and its protein product in cognitive function.

Summary:

  • Normal FMR2 alleles have 10-35 GCC repeats; expanded alleles (>200 repeats) lead to methylation and inactivation of FMR2.
  • FMR2 gene inactivation results in FRAXE mental retardation, characterized by mild intellectual disability and/or autistic symptoms.
  • The FMR2 gene is large (600 kb, 21 exons), with mRNA expressed in adult brain regions (hippocampus, amygdala) and placenta. The FMR2 protein is a putative transcription factor.

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Impact:

  • Understanding the molecular basis of FRAXE provides insights into fragile X-associated disorders.
  • Identifies FMR2 as a key gene in neurodevelopment and cognitive function.
  • Potential for targeted diagnostics and therapeutic strategies for FRAXE and related intellectual disabilities.