Also
Chat GPT:
Yes, it is plausible, but not as a simple universal rule.
Reduced histone acetylation can alter alternative splicing because chromatin state affects how RNA polymerase II moves through a gene and how splicing factors are recruited to nascent RNA. In general, histone acetylation tends to open chromatin, while reduced acetylation tends to make chromatin more compact and can change exon recognition during co-transcriptional splicing. That general chromatin–splicing link is well established.
The important caveat is that the effect is context-dependent. Reduced acetylation does not always mean “more aberrant splicing” in exactly the same direction for every exon. Some exons are promoted by slower elongation and tighter chromatin, others are skipped; the outcome depends on the local gene architecture, splice-site strength, recruited chromatin readers, and which splicing regulators are present. Reviews of the field consistently describe histone marks as part of a combinatorial “splicing code,” not a one-way switch.
So for the SNCA / α-synuclein isoforms discussed above, the careful answer is: reduced histone acetylation could contribute to aberrant splicing in principle, but I do not see strong direct evidence from these sources that reduced histone acetylation is an established primary driver of the specific SNCA splice isoforms linked to α-synuclein misfolding. The SNCA literature more clearly supports altered splicing itself and altered chromatin regulation of SNCA expression, while the direct bridge from histone hypoacetylation → specific SNCA isoform shift → misfolding remains less firmly demonstrated.
There is also an interesting bidirectional possibility: α-synuclein pathology may itself feed back on chromatin. Reviews cite work showing nuclear α-synuclein can inhibit histone acetylation and promote neurotoxicity, which raises the possibility of a vicious circle in which misfolded or overabundant α-synuclein worsens chromatin regulation, potentially including splicing regulation indirectly. That is biologically plausible, but still not the same as proving that reduced histone acetylation was the initial cause of the splice abnormality.
So my bottom line is:
Reduced histone acetylation is a credible upstream contributor to aberrant splicing, including potentially the splice-isoform changes relevant to α-synuclein biology, but it would be too strong to say it is likely the sole or proven cause of the SNCA aberrant splicing above. A better phrasing would be that it is a possible and biologically well-motivated modulator.
I can also set this out as a step-by-step mechanism from histone hypoacetylation → polymerase kinetics/chromatin readers → exon skipping/inclusion → α-synuclein isoform balance → aggregation risk.
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