Brief report: S6 ribosomal protein phosphorylation in autistic frontal cortex and cerebellum: a tissue array analysis.

Scientists looked at brain tissue from people with autism after death. They checked one protein called S6 in two areas: the frontal cortex and the cerebellum.

They used tiny tissue dots on glass slides to compare autistic and non-autistic brains. The goal was to see if S6 was over-active in autism.

S6 activity looked the same in both groups. No big differences showed up in either brain area.

This means the S6 signaling path probably isn’t broken in most people with autism.

Harada et al. (2011) and Carvalho Pereira et al. (2018) both found lower GABA in the living autistic frontal lobe. Eberhart et al. (2006) saw normal S6 in the same region after death. The clash fades when you note: live brains versus stored tissue, two different molecules.

Fatemi et al. (2014) used the same post-mortem method and did find lower GABAA receptor proteins in autistic frontal cortex. So some proteins drop, but S6 does not.

Cioana et al. (2020) and Nijs et al. (2016) also report “no difference” for IGF-1 and glutathione in autism brain tissue. The pattern: many proteins look normal once you open the skull after death.

If you hoped S6 could act as a bio-marker or drug target, this paper says look elsewhere. It also reminds you that live-brain scans can give different answers than post-mortem tissue. When you read new autism brain chemistry, check whether the sample was alive or preserved—it changes the story.