Detailed profile of cognitive dysfunction in children with aspartylglucosaminuria

Aspartylglucosaminuria (AGU) is a rare, recessively inherited lysosomal disease with relatively high prevalence in Finnish population. This progressive disease has a vast impact on patient's cognition and physical health, leading to intellectual disability and shorter life expectancy. Cognitive...

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Bibliographic Details
Published in:Journal of inherited metabolic disease 2020-03, Vol.43 (2), p.318-325
Main Authors: Harjunen, Elina Leena, Laine, Minna, Tikkanen, Ritva, Helenius, Päivi
Format: Article
Language:English
Subjects:
Age
aspartylglucosaminuria
Children
Cognitive ability
cognitive functions
disorder of glycoprotein degradation
Intellectual disabilities
intellectual disability
Intelligence
Intelligence tests
Language
Life span
lysosomal storage disease
neuropsychology
Short term memory
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Summary:Aspartylglucosaminuria (AGU) is a rare, recessively inherited lysosomal disease with relatively high prevalence in Finnish population. This progressive disease has a vast impact on patient's cognition and physical health, leading to intellectual disability and shorter life expectancy. Cognitive functions of 21 7‐ to 14‐year‐old children with AGU were studied cross‐sectionally using Wechsler's Intelligence Scale for Children IV and the results were compared with a standardized Finnish sample. In addition to overall cognitive performance, abilities in discrete cognitive domains, including verbal comprehension, perceptual reasoning, working memory, and processing speed, were examined. The results showed that despite the very low overall level of cognitive performance, there were notable differences between individuals. All those children whose performance was closer to their own age level were 7 to 10 years old. Processing speed appeared more compromised, as compared with verbal comprehension. Furthermore, examining the subtest raw scores, there were no significant positive correlations between age and subtest scores, suggesting that the developmental level of AGU children could be rather stable throughout ages 7 to 14. This study gives insight to the severe nature of AGU disease. Since younger children performed better compared to their age norms than older children, the results raise a question whether the highest peak in cognitive functions is reached at an earlier age than previously thought.
ISSN:0141-8955
1573-2665
DOI:10.1002/jimd.12159