Contra Skolnick On Schizophrenia Microbes

Rebuts gut-microbiome blogger Stephen Skolnick's claim that schizophrenia is caused by the bacterium Ruminococcus gnavus rather than genes. Point by point: scientists infer genetics from twin studies, not just 'runs in families'; a 30-40% identical-twin concordance is exactly what an ~80%-genetic polygenic disorder predicts (per Scott's polygenic-disorders piece); 'missing heritability' is universal to polygenic traits, not special to schizophrenia; microbial inheritance doesn't track the identical-vs-fraternal, adoption, or paternal-line patterns that schizophrenia does (and family environment explains only ~13% of adult microbiome variation); and Skolnick's key cited study had only medicated patients, with its own abstract attributing the microbiome difference to clozapine. Closes that schizophrenia is a multifactorial neurodevelopmental failure (genes + rubella, urban birth, winter birth, prenatal stress) with no single magic-bullet cause.

Quality 72 · Strong. Strong. A crisp, knowledgeable, decisive debunk -- the polygenic-concordance correction and the medication-confound catch are each sufficient on their own, delivered with real behavioural-genetics and psychiatric literacy. Bounded (a rebuttal of one blog post), so mid-Strong.

Claude’s paradigm shift 42 · Moderate. Moderate. Applies established behavioural genetics and the consensus neurodevelopmental model; little new beyond the specific takedown.

Real-world impact 2 · Minor. Minor. Lives in the psychiatry/behavioural-genetics discourse; no material reach. Within-niche.