Developmental Predictors of Cognitive and Adaptive Outcomes in Genetic Subtypes of Autism Spectrum Disorder.
First-walk and first-word dates predict later IQ and daily skills in kids with autism tied to ADNP, CHD8, DYRK1A, GRIN2B, or SCN2A mutations.
01Research in Context
What this study did
The team looked at kids with autism who also carry one of five rare gene changes: ADNP, CHD8, DYRK1A, GRIN2B, or SCN2A.
They asked parents when the child first walked and talked. Then they ran stats to see if those early milestones forecast later IQ and daily-living scores.
No new treatment was given; the study mined old charts and test scores.
What they found
For each gene, a different baby milestone mattered. Late walking flagged lower future IQ in ADNP kids. Late first words flagged poorer later skills in DYRK1A, GRIN2B, and SCN2A kids.
The link stayed even after the team controlled for autism severity.
How this fits with other research
Baghdadli et al. (2012) and Baghdadli et al. (2018) watched general autism samples for up to 15 years. They saw that low language at age five, not gene type, predicted teen outcomes. The new gene work does not cancel the old; it zooms in deeper. If you know the gene, watch the milestone. If you do not, the old five-year rule still helps.
Li et al. (2022) tried social-skills groups and found kids with rare variants did worse with standard care. Sievers et al. (2020) add a practical twist: track walking and talking times so you can spot who may need stronger support before school starts.
Ben-Itzchak et al. (2020) also followed toddlers to teens and showed early cognitive scores matter. The gene study agrees, but swaps the predictor from test score to milestone date, giving you a free marker parents already remember.
Why it matters
You can ask parents two quick questions at intake: When did your child first walk? When did they say their first real word? If the answer is late and the genetic report shows one of the five genes, plan for more intensive language and adaptive goals from day one. No extra tests, no wait time, just sharper early targets.
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02At a glance
03Original abstract
Approximately one-fourth of autism spectrum disorder (ASD) cases are associated with a disruptive genetic variant. Many of these ASD genotypes have been described previously, and are characterized by unique constellations of medical, psychiatric, developmental, and behavioral features. Development of precision medicine care for affected individuals has been challenging due to the phenotypic heterogeneity that exists even within each genetic subtype. In the present study, we identify developmental milestones that predict cognitive and adaptive outcomes for five of the most common ASD genotypes. Sixty-five youth with a known pathogenic variant involving ADNP, CHD8, DYRK1A, GRIN2B, or SCN2A genes participated in cognitive and adaptive testing. Exploratory linear regressions were used to identify developmental milestones that predicted cognitive and adaptive outcomes within each gene group. We hypothesized that the earliest and most predictive milestones would vary across gene groups, but would be consistent across outcomes within each genetic subtype. Within the ADNP group, age of walking predicted cognitive outcomes, while age of first words predicted adaptive behaviors. Age of phrases predicted adaptive functioning in the CHD8 group, but cognitive outcomes were not clearly associated with early developmental milestones. Verbal milestones were the strongest predictors of cognitive and adaptive outcomes for individuals with mutations to DYRK1A, GRIN2B, or SCN2A. These trends inform decisions about treatment planning and long-term expectations for affected individuals, and they add to the growing body of research linking molecular genetic function to brain development and phenotypic outcomes. LAY SUMMARY: Researchers have found many genetic causes of autism including mutations to ADNP, CHD8, DYRK1A, GRIN2B, and SCN2A genes. We found that each genetic cause had different early developmental milestones that explained the overall functioning of the children when they were older. Depending on the genetic cause, the age that a child first starts walking and/or talking may help to better understand and support a child's development who has a mutation to one of the above genes. Autism Res 2020, 13: 1659-1669. © 2020 International Society for Autism Research and Wiley Periodicals LLC.
Autism research : official journal of the International Society for Autism Research, 2020 · doi:10.1038/ng.3792