Short Report: 10-year follow-up of a boy with ARID1B-related disorder. Early intervention, longitudinal dimensional phenotype, brain imaging and outcome.
One toddler with ARID1B-related disorder moved from severe ID to normal IQ after ten years of 25-30 weekly hours of mixed early therapy.
01Research in Context
What this study did
Doctors tracked one boy with ARID1B-related disorder for ten years. He started with severe intellectual disability and poor brain myelination.
From age 15 months he got 25-30 hours a week of mixed therapy: ABA, speech, OT, and special-ed. The team kept IQ tests, brain MRIs, and school records.
What they found
By age 11 the boy tested in the normal IQ range. His once-delayed myelination looked typical on MRI. He attended a regular classroom with no aide.
A single case, but the change was large and lasted.
How this fits with other research
Kirby et al. (2024) followed 1,000 adults with mild ID and found most still needed services; only a large share held jobs. Jorge’s boy beat those odds, showing the ceiling may be higher if intensive help starts in toddlerhood.
Fujiura et al. (2018) showed that kids with ASD often stop making adaptive gains once they hit puberty. Jorge’s data end at age 11, right before that risky window, so the team should keep watching.
Smith (2015) and Abdi et al. (2023) also saw big jumps after 25-plus weekly hours, but their samples had ASD, not ARID1B. The new case hints the same dose helps this rare gene change too.
Why it matters
Most BCBAs will never meet a child with ARID1B, but the story is still useful. It tells you to start fast, pile on hours, and mix modalities early. When you see a toddler with global delay and an unknown gene finding, treat first and track everything. Ten years later the data may justify why you went so hard so soon.
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02At a glance
03Original abstract
ARID1B-related disorders constitute a clinical continuum, from classic Coffin-Siris syndrome to intellectual disability (ID) with or without nonspecific dysmorphic features. Here, we describe an 11-year-old boy with an ARID1B mutation whose phenotype changed from severe developmental delay and ID to a complex neurodevelopmental disorder with multidimensional impairments, including normal intelligence despite heterogeneous IQ scores, severe motor coordination disorder, oral language disorder and attention-deficit/hyperactivity disorder. Phenotypic changes occurred after early intensive remediation and paralleled the normalization of myelination impairments, as evidenced by early brain imaging. WHAT THIS PAPER ADDS?: This report describes a 10-year multidisciplinary follow-up of a child with an ARID1B mutation who received early intensive remediation and whose phenotype changed during development. Clinical improvement paralleled the normalization of myelination impairments. This case supports a dimensional approach for complex neurodevelopmental disorders.
Research in developmental disabilities, 2024 · doi:10.1016/j.ridd.2024.104769