Monogenic mouse models of autism spectrum disorders: Common mechanisms and missing links.
- Authors
- Hulbert, S W; Jiang, Y-H
- Year
- 2016
- Journal
- Neuroscience
- PMID
- 26733386
- DOI
- 10.1016/j.neuroscience.2015.12.040
- PMCID
- PMC4803542
Autism spectrum disorders (ASDs) present unique challenges in the fields of genetics and neurobiology because of the clinical and molecular heterogeneity underlying these disorders. Genetic mutations found in ASD patients provide opportunities to dissect the molecular and circuit mechanisms underlying autistic behaviors using animal models. Ongoing studies of genetically modified models have offered critical insight into possible common mechanisms arising from different mutations, but links between molecular abnormalities and behavioral phenotypes remain elusive. The challenges encountered in modeling autism in mice demand a new analytic paradigm that integrates behavioral assessment with circuit-level analysis in genetically modified models with strong construct validity.
Monogenic mouse models of ASDs have disruptions in overlapping molecular pathwaysThe epigenetic and transcriptional regulator MeCP2 controls the expression of hundreds of different proteins, including BDNF. When BDNF binds to TrkB, its receptor, the resulting signaling pathways converge with pathways known to influence local protein synthesis. The RNA-binding protein FMRP is directly involved in suppressing the translation of mRNA, but other proteins implicated in ASDs, including hamartin and tuberin (the proteins encoded by TSC1 and TSC2), as well as PTEN are upstream signaling molecules that converge on this pathway. The synaptic organizing proteins from the Shank and neurexin/neuroligin families influence these pathways indirectly by affecting the localization and function of glutamate receptors. Similarly, the ubiquitin protein ligase Ube3a normally suppresses the internalization of AMPA receptors, thereby affecting neuronal signaling and plasticity.
| # | Section | Preview |
|---|---|---|
| 0 | 1. Genetic mutations implicated in ASDs | Substantial progress has been made to understand the genetic causes of ASDs. Genes implicated in… |
| 1 | 1. Genetic mutations implicated in ASDs | other cases, mutations that likely disrupt protein function are found in genes that are implicated… |
| 2 | 2. What constitutes a valid animal model for ASDs? | Animal models of psychiatric disorders have classically been evaluated on three criteria, which were… |
| 3 | 2. What constitutes a valid animal model for ASDs? | Construct validity, for our purposes, refers to the rationale behind the creation of the model and… |
| 4 | 2. What constitutes a valid animal model for ASDs? | Face validity refers to the model’s resemblance to the clinical features of the disorder, both in… |
| 5 | 2. What constitutes a valid animal model for ASDs? | Finally, predictive validity refers to the model’s ability to determine the effectiveness that… |
| 6 | 3. Overview of Monogenic Mouse Models of ASDs | By far the most common animals used to model ASDs are mice because of the well-established… |
| 7 | 3. Overview of Monogenic Mouse Models of ASDs | Much of what we know about the underlying mechanism of ASDs comes from detailed analysis of mouse… |
| 8 | 3. Overview of Monogenic Mouse Models of ASDs | should be noted that there are many models that we excluded, including inbred strains, chromosomal… |
| 9 | 3. Overview of Monogenic Mouse Models of ASDs — 3.1 Epigenetic and Transcriptional Regulator: Mecp2 (Rett syndrome) | A number of genes classified as transcriptional or epigenetic regulators have been implicated in… |
| 10 | 3. Overview of Monogenic Mouse Models of ASDs — 3.1 Epigenetic and Transcriptional Regulator: Mecp2 (Rett syndrome) | More than 10 distinct lines of Mecp2 mutant mice have been produced. Mice with the deletion of exon… |
| 11 | 3. Overview of Monogenic Mouse Models of ASDs — 3.1 Epigenetic and Transcriptional Regulator: Mecp2 (Rett syndrome) | Cellular and molecular abnormalities have been identified in Mecp2 mutant mice that likely… |
| 12 | 3. Overview of Monogenic Mouse Models of ASDs — 3.1 Epigenetic and Transcriptional Regulator: Mecp2 (Rett syndrome) | The electrophysiological consequences of MeCP2 dysfunction have also been examined. Reduced… |
| 13 | 3. Overview of Monogenic Mouse Models of ASDs — 3.1 Epigenetic and Transcriptional Regulator: Mecp2 (Rett syndrome) | How the deficiency of MeCP2 results in abnormal functioning of neuronal synapses as well as ASD-like… |
| 14 | 3. Overview of Monogenic Mouse Models of ASDs — 3.1 Epigenetic and Transcriptional Regulator: Mecp2 (Rett syndrome) | A number of research groups have manipulated the expression of MeCP2 in mouse brains temporally and… |
| 15 | 3. Overview of Monogenic Mouse Models of ASDs — 3.1 Epigenetic and Transcriptional Regulator: Mecp2 (Rett syndrome) | can lead to ASD-like features. It remains unclear whether the deficiency of MeCP2 in these… |
| 16 | 3. Overview of Monogenic Mouse Models of ASDs — 3.2 Post-Transcriptional Protein Modifiers or Regulators: Fmr1, Tsc1/2, Ube3a, and Pten — 3.2.1 Fmr1 (Fragile X syndrome) | Fragile X syndrome (FXS), primarily affecting males, also has phenotypic overlap with ASDs and is… |
| 17 | 3. Overview of Monogenic Mouse Models of ASDs — 3.2 Post-Transcriptional Protein Modifiers or Regulators: Fmr1, Tsc1/2, Ube3a, and Pten — 3.2.1 Fmr1 (Fragile X syndrome) | of the human mutation by deleting exon 5 (The Dutch-Belgian Fragile X Consortium, 1994) or exon 1… |
| 18 | 3. Overview of Monogenic Mouse Models of ASDs — 3.2 Post-Transcriptional Protein Modifiers or Regulators: Fmr1, Tsc1/2, Ube3a, and Pten — 3.2.1 Fmr1 (Fragile X syndrome) | Many studies have reported differences in dendritic spines in Fmr1 knockouts. The first study… |
| 19 | 3. Overview of Monogenic Mouse Models of ASDs — 3.2 Post-Transcriptional Protein Modifiers or Regulators: Fmr1, Tsc1/2, Ube3a, and Pten — 3.2.1 Fmr1 (Fragile X syndrome) | In addition to dendritic spine morphology and stability, synaptic plasticity has been well… |
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