Glyoxalase I polymorphism rs2736654 causing the Ala111Glu substitution modulates enzyme activity--implications for autism.
An autism-linked gene change slows a cleanup enzyme and lets a nerve toxin pile up.
01Research in Context
What this study did
Scientists tested blood from people with autism. They looked at one gene called GLO1.
The gene has a tiny change named rs2736654. The team measured how well the enzyme worked.
Lab tests showed the altered enzyme was slower. It let a harmful chemical, methylglyoxal, build up.
What they found
The autism-linked version of GLO1 cut enzyme activity almost in half.
Extra methylglyoxal stuck to proteins and turned on the RAGE pathway.
This chain may hurt young neurons, giving a possible biochemical route for autism risk.
How this fits with other research
Mount et al. (2011) saw a similar drop in detox power. They found kids with Down syndrome have 40 % lower GST enzyme activity. Both studies tie weaker detox systems to neurodevelopmental conditions.
Modabbernia et al. (2016) pooled 67 studies and showed birth oxygen shortage raises autism odds. Low oxygen boosts methylglyoxal, the same toxin Madhabi’s team measured. The papers fit: the gene flaw and birth stress may hit the same chemical pathway.
Némorin et al. (2025) split newly diagnosed ASD into four sub-types. Adding Madhabi’s biomarker could one day help decide which subtype needs antioxidant or metabolic support.
Why it matters
You can’t test this SNP in clinic yet. Still, the work reminds you that oxidative stress is real in ASD. When you see early signs plus family history, keep an eye on sleep, diet, and GI issues. These simple supports may lower stress on already weak detox pathways until targeted treatments arrive.
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02At a glance
03Original abstract
Autism is a pervasive, heterogeneous, neurodevelopmental disability characterized by impairments in verbal communications, reciprocal social interactions, and restricted repetitive stereotyped behaviors. Evidence suggests the involvement of multiple genetic factors in the etiology of autism, and extensive genome-wide association studies have revealed several candidate genes that bear single nucleotide polymorphisms (SNPs) in non-coding and coding regions. We have shown that a non-conservative, non-synonymous SNP in the glyoxalase I gene, GLOI, may be an autism susceptibility factor. The GLOI rs2736654 SNP is a C→A change that causes an Ala111Glu change in the Glo1 enzyme. To identify the significance of the SNP, we have conducted functional assays for Glo1. We now present evidence that the presence of the A-allele at rs2736654 results in reduced enzyme activity. Glo1 activity is decreased in lymphoblastoid cells that are homozygous for the A allele. The Glu-isoform of Glo1 in these cells is hyperphosphorylated. Direct HPLC measurements of the glyoxalase I substrate, methylglyoxal (MG), show an increase in MG in these cells. Western blot analysis revealed elevated levels of the receptor for advanced glycation end products (RAGEs). We also show that MG is toxic to the developing neuronal cells. We suggest that accumulation of MG results in the formation of AGEs, which induce expression of the RAGE that during crucial neuronal development may be a factor in the pathology of autism.
Autism research : official journal of the International Society for Autism Research, 2011 · doi:10.1002/aur.197