Haploinsufficiency of the SHANK3 gene is causally linked to autism spectrum disorder (ASD), and ASD-associated genes are also enriched for chromatin remodelers. Here we found that brief treatment with romidepsin, a highly potent class I histone deacetylase (HDAC) inhibitor, alleviated social deficits in Shank3-deficient mice, which persisted for ~3 weeks. HDAC2 transcription was upregulated in these mice, and knockdown of HDAC2 in prefrontal cortex also rescued their social deficits. Nuclear localization of β-catenin, a Shank3-binding protein that regulates cell adhesion and transcription, was increased in Shank3-deficient mice, which induced HDAC2 upregulation and social deficits. At the downstream molecular level, romidepsin treatment elevated the expression and histone acetylation of Grin2a and actin-regulatory genes and restored NMDA-receptor function and actin filaments in Shank3-deficient mice. Taken together, these findings highlight an epigenetic mechanism underlying social deficits linked to Shank3 deficiency, which may suggest potential therapeutic strategies for ASD patients bearing SHANK3 mutations.
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We thank X.Q. Chen for excellent technical support. This work was supported by the Nancy Lurie Marks Family Foundation and grants from the National Institutes of Health (MH112237, MH108842 and DA037618) to Z.Y. We also thank E.F. Trachtman and the Varanasi family for their donations.
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Integrated supplementary information
Supplementary Figure 1 Romidepsin treatment leads to the sustained increase of social interaction time and social preference in young Shank3-deficient mice.
(a) Box plots showing the time spent investigating either the social (Soc) or nonsocial (NS) stimulus during sociability testing in young (5-6 weeks old) male Shank3+/ΔC mice with a brief treatment of romidepsin (RMD, 0.25 mg/kg, i.p., 3x, n=10) or saline (n=10) prior to and at different days after the injection. F3,36(treatment)=137.4, P<0.0001; +++ P<0.001, (Soc vs. NS), ** P<0.01, *** P<0.001 (saline vs. romidepsin), two-way rmANOVA. (b) Representative heat maps illustrating the time spent in different locations of the 3 chambers from the social preference tests in Shank3+/ΔC mice treated with RMD or saline. Locations of Soc and NS stimuli are labeled with the circles. (c) Bar graphs (mean ± SEM) and scatter plots showing the preference index of the sociability testing in adult (10-11 weeks old) Shank3+/ΔC (n=13) or WT (n=10) mice before and after romidepsin (0.25 mg/kg, i.p., 3x) treatment. F3,45=10.5, P<0.0001; * P<0.05,*** P<0.001, one-way ANOVA. (d) Bar graphs (mean ± SEM) and scatter plots showing the social preference index in Shank3+/ΔC mice (n=9, ~10 weeks old) before and after the second-round romidepsin treatment. F2,24=2.6, ^ P=0.09, one-way ANOVA.
Supplementary Figure 2 Current antipsychotics fail to increase social interaction time, while the pan-HDAC inhibitor trichostatin A (TSA) transiently improves social behaviors in Shank3-deficient mice.
(a–e) Box plots showing the time spent investigating either the social (Soc) or nonsocial (NS) stimulus during sociability testing in young (5-6 weeks old) male Shank3+/ΔC mice treated with fluoxetine (10 mg/kg, i.p., 14x, a, n=9), clozapine (5 mg/kg, i.p., 3x, b, n=11), valproic acid (VPA, 100 mg/kg, 3x, c, n=11), aripiprazole (1 mg/kg, 3x, d, n=9) or risperidone (0.1 mg/kg, 3x, e, n=10). In (c), F2,40(treatment)=0.71, P=0.5; +++ P<0.001 (Soc vs. NS), two-way rmANOVA. (f, g) Plots showing the preference index (f) and the time spent investigating either the Soc or NS stimulus (g) during sociability testing in Shank3+/ΔC mice before and after TSA treatment (0.5 mg/kg, i.p., 3x, n=8). In (f), F2,21=19.7, P<0.0001, one-way ANOVA. In (g), F2,28(treatment)=4.15, P=0.026; ++ P<0.01, +++ P<0.001 (Soc vs. NS), ### P<0.001 (pre- vs. post-injection), two-way rmANOVA. Inset (d,e,g): Representative heat maps illustrating the time spent in different locations of the 3 chambers (blue: 0 sec; red: ~20 sec) from the social preference tests of drug-treated Shank3+/ΔC mice.
(a) PCR images showing the ChIP (AcetyH3-occupied DNA), input (total DNA) and no-template control (NTC) signals with 3 primers (P1, P2, P3) designed against the promoter regions of Grin2a and Grin2b. The expected sizes of PCR products are labeled on the gels. The final primers used in the quantitative ChIP experiments are labeled by red circles. Top: diagram showing the primer locations on the 5′ upstream sequence of Grin2a and Grin2b. TSS, transcriptional start site. (b) The amplification curve and melt curve for AcetyH3-ChIP, input, and IgG control samples.
Supplementary Figure 4 Romidepsin treatment restores NMDAR synaptic function and global histone acetylation at 16–18 d, but not 30–32 d, postinjection.
(a,b) Input-output curves of NMDAR-EPSC in PFC pyramidal neurons from Shank3+/ΔC mice (Het, male) receiving treatment of romidepsin (RMD, i.p., 0.25 mg/kg, 3x) or saline. Recordings were performed at 16-18 days (a) or 30-32 days (b) post-injection. n=12 cells/3 mice each group. In (a), F1,22(treatment)=13.56, P=0.0013; * P<0.05, *** P<0.001, two-way rmANOVA. Data are mean ± SEM. Inset: representative NMDAR-EPSC traces. (c,d) Immunoblots and quantification analysis of the level of acetylated H3 and total H3 in the nuclear fraction of cortical slices from WT or Shank3+/ΔC mice (male) treated with saline or romidepsin at 16-18 days or 30-32 days post-injection. n=6 each group. In (d), F2,15=12.55, P=0.0006 (16-18 days); F2,15=27.72, P<0.0001 (30-32 days); ** P<0.01, *** P<0.001, ns, not significant, one-way ANOVA.
(a,b) PCR images showing the ChIP (AcetyH3-occupied DNA), input (total DNA) and no-template control (NTC) signals with 3 primers (P1, P2, P3) designed against the promoter regions of Arhgef7 and Limk1. The expected sizes of PCR products are labeled on the gels. Top Inset: diagram showing the primer locations on the 5′ upstream sequence of Arhgef7 and Limk1. TSS, transcriptional start site. Right Inset: The amplification curve and melt curve for AcetyH3-ChIP, input, and NTC samples. The final primers used in the quantitative ChIP experiments are labeled by red circles.
Supplementary Figure 6 Romidepsin treatment restores actin filaments in PFC of Shank3-deficient mice.
(a) High magnification confocal images (40x) of F-actin staining with phalloidin (co-stained with PSD-95 and DAPI) in PFC slices of WT vs. Shank3+/ΔC mice (5-6 weeks old, male) with i.p. injections of saline or romidepsin (0.25 mg/kg, 3x). (b) Quantification of PSD-95 levels (integrated densities) in PFC slices of different animal groups. n=27 images/3 mice each group.
Supplementary Figure 7 Romidepsin treatment has no effect on the expression of genes encoding NMDAR subunits or actin regulators in other brain regions and peripheral organs of Shank3-deficient mice.
(a,b) Quantitative real-time RT-PCR data on the mRNA level of Grin1, Grin2a, Grin2b, Arhgef7 and Limk1 in striatum, VTA, kidney and heart from WT or Shank3+/ΔC mice (5-6 weeks old, male) injected with saline or romidepsin (0.25 mg/kg, i.p., 3x). n=6 each group.
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Qin, L., Ma, K., Wang, ZJ. et al. Social deficits in Shank3-deficient mouse models of autism are rescued by histone deacetylase (HDAC) inhibition. Nat Neurosci 21, 564–575 (2018). https://doi.org/10.1038/s41593-018-0110-8
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