Abstract
Glutaric aciduria type I (GA-I) is an inherited metabolic disorder that may lead to severe motor disorder and cognitive impairment. GA-I is now included in the newborn screening programme in many countries as early detection allows for prompt treatment and effectively reduces the risk of poor developmental outcome. Information regarding the long-term neurodevelopmental outcome of children with GA-I treated early is sparse.
We recruited children with a confirmed diagnosis of GA-I diagnosed via newborn screening, treated in our centre and >3 years of age (n = 6). Children were assessed at two time points using a comprehensive neuropsychological test battery. Four of these had been the subject of a previous report. All participants were male, 3–6 years at the initial assessment and 6–12 years of age at the follow-up assessment.
Fine motor skills were below average in all patients. Speech, which was affected in all four patients reported previously, improved following speech therapy. IQ scores remained generally stable within the normal range. Executive functioning was average to high average in four patients. Behaviour, as assessed through parental questionnaires, was problematic in two patients. Compounding factors included child neglect, family history of autism and multiple admissions to hospital (n = 1 in each).
GA-I affects fine motor skills and speech, regardless of early treatment, but not IQ scores. Patients with GA-I should be referred for assessment and appropriate early intervention. Further research is needed to correlate specific neuropsychological deficits with neuroimaging.
Competing interests: None declared
Presented in part (poster presentation) at the International Neuropsychological Society 41st Annual meeting, Hawaii, USA, 2013
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Acknowledgements
This work was supported by the Victorian Government’s Operational Infrastructure Support Program. This manuscript is being submitted as part of the requirements of the University of Melbourne for PhD with publication.
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Communicated by: Bridget Wilcken
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Synopsis
Children with glutaric aciduria type I who are diagnosed through newborn screening have reduced fine motor skills and are at risk of speech and language difficulties despite early diagnosis and treatment.
Compliance with Ethics Guidelines
Amy Brown, Louise Crowe, Vicki Anderson, Miriam Beauchamp and Avihu Boneh declare no conflict of interest.
Informed Consent
All procedures followed were in accordance with the ethical standards of responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as advised in 2000 (5). Informed consent was obtained from all patients for being included in the study. Ethics approval was granted from the RCH Human Research Ethics Committee (HREC #32218A).
Details of the Contributions of Individual Authors
Amy Brown recruited patient subjects, performed neuropsychological assessments, devised a study protocol, collected data and wrote and edited the manuscript.
Louise Crowe participated in discussions about the manuscript and assisted in reviewing and editing the manuscript.
Miriam Beauchamp devised previous study protocol, collected previous data and assisted in reviewing and editing the manuscript.
Vicki Anderson participated in devising a study protocol, in the discussions about the manuscript and in reviewing and editing the manuscript.
Avihu Boneh participated in devising a study protocol, in the discussions about the manuscript and in reviewing and editing the manuscript.
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Brown, A., Crowe, L., Beauchamp, M.H., Anderson, V., Boneh, A. (2014). Neurodevelopmental Profiles of Children with Glutaric Aciduria Type I Diagnosed by Newborn Screening: A Follow-Up Case Series. In: Zschocke, J., Baumgartner, M., Morava, E., Patterson, M., Rahman, S., Peters, V. (eds) JIMD Reports, Volume 18. JIMD Reports, vol 18. Springer, Berlin, Heidelberg. https://doi.org/10.1007/8904_2014_360
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