Glutamate Receptor Gene Variants Linked to Comorbid ADHD and Autism

Neurodevelopmental disorders such as attention-deficit hyperactivity disorder (ADHD) and autism spectrum disorder typically manifest early, with a peak age at onset of 5.5 years [1]. Clinicians are increasingly managing patients who present with significant phenotypic overlap, where diagnostic lines blur. This clinical complexity is reflected in systemic associations, such as the link between atopic dermatitis and neurodevelopmental conditions, which carries a pooled odds ratio of 1.28 for ADHD and 1.87 for autism spectrum disorder [2]. These multifaceted presentations contribute to a substantial global burden of pediatric disability, with mental disorders accounting for 125.3 million disability-adjusted life-years (a measure of overall disease burden) as of 2019 [3]. While recent genomic analyses have identified 102 risk genes for developmental disorders [4], the specific molecular factors that distinguish complex, comorbid cases from single-diagnosis presentations have remained poorly defined, posing a challenge for precise diagnosis and prognosis.