Behavioral correlates of maternal antibody status among children with autism.

Braunschweig et al. (2012) drew blood from moms of kids with autism and moms of typical kids. They checked which moms had IgG antibodies that stuck to two fetal-brain protein bands, 37/73 kDa and 39/73 kDa.

The team then asked: do moms with those antibodies have children with worse language or more irritability?

Moms who reacted to 37/73 kDa were far more likely to have a child with full autism, not just broad ASD. Their kids also had lower expressive-language scores.

Reaction to 39/73 kDa was tied to any ASD label and to higher irritability scores.

Peters et al. (2013) ran the exact same lab test in Basque families and got the same pattern—only moms of kids with ASD showed those antibody bands. This direct replication adds confidence.

Lyall et al. (2014) widened the lens. They looked at any maternal autoimmune disease, not just these antibodies. They found a small jump in odds for developmental disorders overall, but not for ASD alone. The antibody work sharpens that picture by pointing to specific proteins.

Zhu et al. (2020) pooled data on moms with rheumatoid arthritis or lupus. Their meta-analysis also shows a small rise in ASD odds. The new detail: Daniel’s antibody test may catch risk even before a mom is diagnosed with full autoimmune disease.

You now have a blood-test clue you can watch for. If a mom carries these fetal-brain antibodies, flag her toddler for early language screening and consider extra parent training on irritability. The marker is not a verdict, but it helps you start services sooner.