Cited by 85Genetics and Neurodevelopmental DisordersAutism Spectrum Disorder ResearchGenetic Neurodegenerative Diseases

FMR1 premutation and full mutation molecular mechanisms related to autism

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Hagerman, Randi, Au, Jacky, Hagerman, Paul·2011·Journal of Neurodevelopmental Disorders

Abstract

Fragile X syndrome (FXS) is caused by an expanded CGG repeat (>200 repeats) in the 5′ un-translated portion of the fragile X mental retardation 1 gene (FMR1) leading to a deficiency or absence of the FMR1 protein (FMRP). FMRP is an RNA-binding protein that regulates the translation of a number of other genes that are important for synaptic development and plasticity. Furthermore, many of these genes, when mutated, have been linked to autism in the general population, which may explain the high comorbidity that exists between FXS and autism spectrum disorders (ASD). Additionally, premutation repeat expansions (55 to 200 CGG repeats) may also give rise to ASD through a different molecular mechanism that involves a direct toxic effect of FMR1 mRNA. It is believed that RNA toxicity underlies much of the premutation-related involvement, including developmental concerns like autism, as well as neurodegenerative issues with aging such as the fragile X-associated tremor ataxia syndrome (FXTAS). RNA toxicity can also lead to mitochondrial dysfunction, which is common in older premutation carriers both with and without FXTAS. Many of the problems with cellular dysregulation in both premutation and full mutation neurons also parallel the cellular abnormalities that have been documented in idiopathic autism. Research regarding dysregulation of neurotransmitter systems caused by the lack of FMRP in FXS, including metabotropic glutamate receptor 1/5 (mGluR1/5) pathway and GABA pathways, has led to new targeted treatments for FXS. Preliminary evidence suggests that these new targeted treatments will also be beneficial in non-fragile X forms of autism.

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  • Only about one-third of women with a full mutation have intellectual disability; most have normal IQ, although learning and emotional problems are common.

    “Due to compensation by the unaffected X chromosome, only one-third of female carriers with a full mutation (FM) have ID; the majority have normal IQ, although learning difficulties and emotional problems are common (7).”
  • The fragile X mutation is the most common single genetic cause of autism, occurring in 1% to 6% of boys with autism spectrum disorder.

    “The fragile X mutation is the most common single genetic cause of autism, occurring in 1% to 6% of boys with ASD (7).”

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Research works printed but not linked: 3

  1. Brunberg J, Greco C, Hagerman RJ, Schwartz P, Bakhtiar B, Johl J, Hagerman PJ, Tassone F, editors. Fragile X-associated tremor/ataxia syndrome (FXTAS): autopsy brain MR imaging alterations correlated with histopathology. American Society of Neuroradiology 41st annual meeting and symposium; 2003; Washington, DC, April 26–May 2.
  2. Kooy F, Heulens I, D’Hulst C, Van der Aa N, Bagni C, Hassan B, De Deyn P, editors. The GABAA receptor as a potential target for therapy of the fragile X syndrome [abstract]. NFXF 12th international FX conference; 2010 July 21–25; Detroit, MI.
  3. Sellier C, Hagerman P, Willemsen R, Charlet-Berguerand N, editors. DROSHA/DGCR8 sequestration by expanded CGG repeats leads to global micro-RNA processing alteration in FXTAS patients [abstract]. 12th international fragile X conference; 2010 July 21–25; Detroit, MI.

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Authors
Hagerman, R., Au, J., & Hagerman, P.
Affiliations
  • University of California Davis Medical Center (US)
  • University of California, Davis (US)
Corresponding author
Hagerman, Randi
Venue
Journal of Neurodevelopmental Disorders
Published
2011-05-27
Volume
3
Issue
3
Pages
211-224
ISSN
  • 1866-1947 (ISSN-L)
  • 1866-1955
OpenAlex
W2150021890
Cited by
85
References
174
Citations by year
2026: 1 · 2025: 4 · 2024: 6 · 2023: 5 · 2022: 2 · 2021: 8 · 2020: 3 · 2019: 2 · 2018: 11 · 2017: 6 · 2016: 4 · 2015: 4 · 2014: 7 · 2013: 8 · 2012: 12
FWCI
5.79
Type
journal article
Language
en
Open access
Locations
  • Journal of Neurodevelopmental Disorders (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • National Institute on Aging (RL1AG032119, RL1AG032115)
  • National Institute on Drug Abuse (TL1DA024854)
  • National Institute of Dental and Craniofacial Research (UL1DE019583)
  • National Center for Research Resources (RR-024146, HD02274, AG032115, AG032119, HD036071, 90DD05969, UL1RR024146, DE019583, DA024854)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (P30HD002274, R01HD036071)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Genetic Neurodegenerative Diseases
Keywords
fragile X premutation, FMR1 full mutation, fragile X syndrome, autism spectrum disorder, FMRP, CGG repeat expansion, RNA toxicity, fragile X-associated tremor/ataxia syndrome, mitochondrial dysfunction, GABAergic neurotransmission, synaptic development

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