Woods, E. orcid.org/0000-0003-2349-2688, Holmes, N., Denommé‐Pichon, A.S. orcid.org/0000-0002-8986-8222 et al. (14 more authors) (2025) An international ASXL3 natural history study: deep phenotypic analyses including detailed reports of a milder phenotype, novel associations, and clinical recommendations. American Journal of Medical Genetics Part A. e64157. ISSN 1552-4825
Abstract
Natural History Studies can help inform clinician and caregiver expectations, form the basis of management guidelines, and provide a comparator for therapeutic intervention. In rare conditions, where collection of prospective longitudinal data is untimely and impractical, quasi-natural history data—from multiple individuals of different ages—provides an alternative approach. A detailed genotype–phenotype analysis of 64 individuals with pathogenic or likely pathogenic ASXL3 variants was carried out, comprising qualitative and quantitative data. The majority of data was collected through direct clinic consultation with the individual and/−or caregiver(s). We report significant phenotypic variability, but improvement trends in feeding, hypotonia, verbalisation, and motor skills over time. Findings include: an increased prevalence of antenatal and neonatal structural anomalies, an emerging renal phenotype, a tendency for poor post-natal growth (with novel reports of obesity later in childhood), and a lower-than-expected prevalence of seizures (compared to the existing literature). We also provide the first qualitative descriptions of several mildly affected probands, at different ages. Our recommendations include: baseline renal imaging after diagnosis, and Dental and Ophthalmological follow-up for all. We describe the largest-to-date cohort of individuals with ASXL3-related disorder, including 24 novel variants, novel clinical findings, quasi-natural history trends, management insights, and recommendations.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2025 The Author(s). American Journal of Medical Genetics Part A published by Wiley Periodicals LLC. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | ASXL3; Bainbridge-Ropers; natural history study; neurodevelopmental |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Medicine, Dentistry and Health (Sheffield) > School of Medicine and Population Health |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 30 Jun 2025 15:29 |
Last Modified: | 30 Jun 2025 15:29 |
Status: | Published online |
Publisher: | Wiley |
Refereed: | Yes |
Identification Number: | 10.1002/ajmg.a.64157 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:228529 |