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ERC Grant Fuels Innovative Strategies to Enhance Adult ADHD Diagnosis

September 4, 2025
in Medicine
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Kelli Lehto, Associate Professor of Neuropsychiatric Genomics at the University of Tartu, is spearheading a groundbreaking research initiative funded by the prestigious European Research Council (ERC) to unravel the biological underpinnings of attention deficit hyperactivity disorder (ADHD) in adults. This project aims to transcend traditional diagnostic frameworks by integrating genomic data with advanced machine learning analytics alongside comprehensive environmental and lifestyle information. The initiative leverages large-scale biobank datasets from multiple European nations, representing a bold step forward in psychiatric genomics and personalized medicine.

ADHD has long been recognized as a neurodevelopmental disorder predominantly diagnosed in children, characterized by impulsivity, hyperactivity, and inattention. However, recent epidemiological data reveal a striking rise in adult ADHD diagnoses, a phenomenon particularly evident in Estonia, where numbers have dramatically increased in the past five years. This trend aligns with international observations, suggesting that ADHD symptoms manifest persistently into adulthood or may initially emerge later in life, warranting urgent scientific attention.

Despite extensive research on pediatric ADHD, adult presentations of the disorder remain poorly understood, especially concerning their etiological complexity. Adult ADHD is complicated by the frequent presence of comorbid mental health disorders such as depression and anxiety, and overlaps symptomatically with conditions driven by environmental stressors including chronic fatigue and psychosocial pressures. This diagnostic ambiguity contributes to underdiagnosis or misdiagnosis, impeding effective treatment and negatively impacting patient outcomes.

Professor Lehto highlights a critical gap in current psychiatric practice: the absence of objective biological markers for ADHD. Presently, diagnoses depend heavily on subjective patient reports and clinical assessments, which can be inconsistent and influenced by overlapping symptomatology. This reliance underscores the necessity for novel biologically grounded diagnostic tools that can differentiate ADHD from other mental health conditions with greater precision.

The project’s core scientific innovation resides in employing high-dimensional genetic data derived from large biobanks, which include the University of Tartu’s Estonian Biobank and similar repositories across Norway, the Netherlands, Sweden, and the United Kingdom. By analyzing genome-wide association study (GWAS) data in conjunction with detailed phenotypic information encompassing lifestyle factors such as smart device usage, the research team intends to dissect the polygenic architecture of adult ADHD symptoms.

One of the major challenges the project addresses is disentangling which clinical traits are genuinely driven by underlying genetic risk factors associated with ADHD versus those attributable to external influences or comorbidities. This distinction is vital not only for understanding pathophysiology but also for developing targeted interventions. The researchers hypothesize that specific gene variants contribute differentially to discrete symptom clusters, an insight that could transform psychiatric nosology.

Employing cutting-edge machine learning algorithms, the project will analyze extensive questionnaire data capturing hundreds of mental health symptoms, personality traits, and lifestyle variables. This computational approach allows for the identification of symptom clusters that most strongly correlate with genetic susceptibility to ADHD. Such data-driven stratification aims to create a biologically informed phenotype classification rather than relying solely on traditional symptom checklists.

The culmination of these efforts will be the design of an innovative, biology-based screening tool for adult ADHD diagnosis. Importantly, the intended questionnaire format is envisioned as a cost-effective and accessible alternative to genetic testing, democratizing early and accurate detection. This advancement has the potential to revolutionize clinical workflows by enabling clinicians to identify previously undiagnosed adults who have been coping with ADHD-related impairments throughout their lives.

Beyond ADHD, Professor Lehto emphasizes that the methodology developed may have broader applications in psychiatry, where multiple disorders exhibit overlapping symptoms and shared genetic risk factors. A more precise, genetics-informed framework for diagnosing mental health conditions could improve treatment personalization and efficacy across various psychiatric illnesses.

The research is supported by a competitive European Commission grant amounting to nearly €1.5 million, underscoring the significance and expected impact of the work. The grant selection process was highly rigorous, with only 12% of proposals funded from a large pool of over 3,900 applicants, highlighting the project’s scientific excellence and innovation.

This interdisciplinary endeavor, at the interface of neuropsychiatric genomics, psychology, and data science, exemplifies a modern approach to complex mental health disorders. It leverages vast datasets and computational power to decode the intricate web of genetics and environment contributing to adult ADHD. The anticipated outcomes promise not only diagnostic innovation but also deeper mechanistic insights that could guide future therapeutic targets.

In conclusion, Kelli Lehto’s project represents a pivotal advancement in psychiatric research, pushing the boundaries of knowledge about adult ADHD and underscoring the increasing importance of integrating genetic and environmental data. The novel diagnostic tools resulting from this research could alleviate the significant burden of undiagnosed ADHD in adults, offering hope for improved quality of life through timely and tailored interventions.


Subject of Research: Genetic and environmental determinants of adult ADHD; development of biology-based diagnostic tools for adult ADHD.

Article Title: Decoding Adult ADHD: Pioneering Genetics and Machine Learning to Revolutionize Diagnosis

News Publication Date: Information not provided.

Web References: University of Tartu Estonian Biobank

References: Information not provided.

Image Credits: Photo by Andres Tennus

Keywords: Adult ADHD, neuropsychiatric genomics, genetic risk variants, machine learning, psychiatric diagnostics, biobank data, European Research Council grant, personalized medicine, neurodevelopmental disorders, mental health biomarkers

Tags: ADHD symptoms in adulthoodadult ADHD diagnosisadult mental health disordersbiobank datasets for ADHD researchcomorbidity in adult ADHDenvironmental factors in ADHDERC grant researchgenomic data and machine learninginnovative diagnostic strategies for ADHDneuropsychiatric genomicspersonalized medicine in ADHDpsychiatric genomics advancements
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