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.
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| 40 | 3. Overview of Monogenic Mouse Models of ASDs β 3.2 Post-Transcriptional Protein Modifiers or Regulators: Fmr1, Tsc1/2, Ube3a, and Pten β 3.2.4 Ube3a (Angelman syndrome and non-syndromic ASDs) | unchanged in Ube3a2xTg barrel cortex (Smith et al., 2011). Whole-cell patch clamp recording revealedβ¦ |
| 41 | 3. Overview of Monogenic Mouse Models of ASDs β 3.2 Post-Transcriptional Protein Modifiers or Regulators: Fmr1, Tsc1/2, Ube3a, and Pten β 3.2.4 Ube3a (Angelman syndrome and non-syndromic ASDs) | Currently, no conditional knockouts of Ube3a have been reported, so there is limited knowledge aboutβ¦ |
| 42 | 3. Overview of Monogenic Mouse Models of ASDs β 3.2 Post-Transcriptional Protein Modifiers or Regulators: Fmr1, Tsc1/2, Ube3a, and Pten β 3.2.4 Ube3a (Angelman syndrome and non-syndromic ASDs) | Numerous targets of Ube3a-dependent ubiquitination have been identified (Kumar et al., 1999; Mani etβ¦ |
| 43 | 3. Overview of Monogenic Mouse Models of ASDs β 3.3 Synaptic Organizing and Scaffolding: Shanks, Neurexins/Neuroligins β 3.3.1 Shanks (Phelan-McDermid syndrome and non-syndromic ASDs) | Mutations in the SHANK/ProSAP family genes (SHANK1β3), particularly SHANK2 and SHANK3, have beenβ¦ |
| 44 | 3. Overview of Monogenic Mouse Models of ASDs β 3.3 Synaptic Organizing and Scaffolding: Shanks, Neurexins/Neuroligins β 3.3.1 Shanks (Phelan-McDermid syndrome and non-syndromic ASDs) | Mouse models for each of the three Shank proteins have been created to better understand the role ofβ¦ |
| 45 | 3. Overview of Monogenic Mouse Models of ASDs β 3.3 Synaptic Organizing and Scaffolding: Shanks, Neurexins/Neuroligins β 3.3.1 Shanks (Phelan-McDermid syndrome and non-syndromic ASDs) | Ten different lines of Shank3 mutant mice have been reported, but due to the transcriptionalβ¦ |
| 46 | 3. Overview of Monogenic Mouse Models of ASDs β 3.3 Synaptic Organizing and Scaffolding: Shanks, Neurexins/Neuroligins β 3.3.1 Shanks (Phelan-McDermid syndrome and non-syndromic ASDs) | Although there are no published studies that have explored the role of the Shank proteins inβ¦ |
| 47 | 3. Overview of Monogenic Mouse Models of ASDs β 3.3 Synaptic Organizing and Scaffolding: Shanks, Neurexins/Neuroligins β 3.3.1 Shanks (Phelan-McDermid syndrome and non-syndromic ASDs) | et al., 2011). However, deletion of exon 11 (Schmeisser et al., 2012) or exon 21 (Kouser et al,β¦ |
| 48 | 3. Overview of Monogenic Mouse Models of ASDs β 3.3 Synaptic Organizing and Scaffolding: Shanks, Neurexins/Neuroligins β 3.3.1 Shanks (Phelan-McDermid syndrome and non-syndromic ASDs) | Accumulating evidence in vivo suggests that Shank proteins are required for proper synaptic functionβ¦ |
| 49 | 3. Overview of Monogenic Mouse Models of ASDs β 3.3 Synaptic Organizing and Scaffolding: Shanks, Neurexins/Neuroligins β 3.3.1 Shanks (Phelan-McDermid syndrome and non-syndromic ASDs) | The findings from Shank3 mutants are also somewhat inconsistent, but many of the differences can beβ¦ |
| 50 | 3. Overview of Monogenic Mouse Models of ASDs β 3.3 Synaptic Organizing and Scaffolding: Shanks, Neurexins/Neuroligins β 3.3.1 Shanks (Phelan-McDermid syndrome and non-syndromic ASDs) | those observed by Wang et al. and Jaramillo et al. in the hippocampus, but resulted in decreasedβ¦ |
| 51 | 3. Overview of Monogenic Mouse Models of ASDs β 3.3 Synaptic Organizing and Scaffolding: Shanks, Neurexins/Neuroligins β 3.3.1 Shanks (Phelan-McDermid syndrome and non-syndromic ASDs) | The mechanism through which deletion of Shank proteins leads to synaptic dysfunction is likely dueβ¦ |
| 52 | 3. Overview of Monogenic Mouse Models of ASDs β 3.3 Synaptic Organizing and Scaffolding: Shanks, Neurexins/Neuroligins β 3.3.1 Shanks (Phelan-McDermid syndrome and non-syndromic ASDs) | Moreover, changes in the densities of receptors and synaptic proteins have been reported in vivo.β¦ |
| 53 | 3. Overview of Monogenic Mouse Models of ASDs β 3.3 Synaptic Organizing and Scaffolding: Shanks, Neurexins/Neuroligins β 3.3.1 Shanks (Phelan-McDermid syndrome and non-syndromic ASDs) | Mice with different Shank3 mutations have varying degrees of altered expression of receptors,β¦ |
| 54 | 3. Overview of Monogenic Mouse Models of ASDs β 3.3 Synaptic Organizing and Scaffolding: Shanks, Neurexins/Neuroligins β 3.3.2 Neurexins/Neuroligins (non-syndromic ASDs) | Mutations in the genes encoding the presynaptic cell-adhesion molecules, neurexins, and theirβ¦ |
| 55 | 3. Overview of Monogenic Mouse Models of ASDs β 3.3 Synaptic Organizing and Scaffolding: Shanks, Neurexins/Neuroligins β 3.3.2 Neurexins/Neuroligins (non-syndromic ASDs) | A multitude of mice with mutations in the neurexins, neuroligins, and related genes have beenβ¦ |
| 56 | 3. Overview of Monogenic Mouse Models of ASDs β 3.3 Synaptic Organizing and Scaffolding: Shanks, Neurexins/Neuroligins β 3.3.2 Neurexins/Neuroligins (non-syndromic ASDs) | In addition to the study that reported ASD-like behaviors in mice overexpressing a dominant-negativeβ¦ |
| 57 | 3. Overview of Monogenic Mouse Models of ASDs β 3.3 Synaptic Organizing and Scaffolding: Shanks, Neurexins/Neuroligins β 3.3.2 Neurexins/Neuroligins (non-syndromic ASDs) | Unlike the other mouse models of ASDs, individual neurexin and neuroligin mutants do not have manyβ¦ |
| 58 | 3. Overview of Monogenic Mouse Models of ASDs β 3.3 Synaptic Organizing and Scaffolding: Shanks, Neurexins/Neuroligins β 3.3.2 Neurexins/Neuroligins (non-syndromic ASDs) | still express Nlgn1 (Kwon et al., 2012). Whereas mice lacking Nlgn2 have normal numbers of bothβ¦ |
| 59 | 3. Overview of Monogenic Mouse Models of ASDs β 3.3 Synaptic Organizing and Scaffolding: Shanks, Neurexins/Neuroligins β 3.3.2 Neurexins/Neuroligins (non-syndromic ASDs) | Although changes in cellular and spine morphology in neurexin and neuroligin mouse models of ASD areβ¦ |
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