Alström syndrome (OMIM#203800) is an ultra-rare autosomal recessive monogenic disease presenting pathogenic variants in ALMS1 (chromosome 2p13). It is characterized by early onset of blindness, hearing loss and systemic comorbidities, with delayed development without cognitive impairment. We aimed to investigate the cognitive functions and describe new pathogenic variants in Alström syndrome patients. Nineteen patients (13 adults, 6 children) underwent a thorough clinical, genetic, laboratory, instrumental, and neurocognitive assessment. Six new pathogenic variants in ALMS1 including the first described in exon 6 were identified. Four patients displayed a “mild phenotype” characterized by slow disease onset or absence of complications, including childhood obesity and association with at least one pathogenic variant in exon 5 or 6. At neurocognitive testing, a significant proportion of patients had deficits in three neurocognitive domains: similarities, phonological memory, and apraxia. In particular, 53% of patients showed difficulties in the auditory working memory test. We found ideomotor and buccofacial apraxia in 74% of patients. “Mild phenotype” patients performed better on auditory working memory and ideomotor apraxia test than “typical phenotype” ones (91.9 + 16.3% vs. 41.7 + 34.5% of correct answers, Z = 64.5, p <.01 and 92.5 + 9.6 vs. 61.7 + 26.3, Z = 61, p <.05, respectively). Deficits in auditory working memory, ideomotor, and buccofacial apraxia were found in these patients and fewer neuropsychological deficits were found in the “mild” phenotype group. Furthermore, in the “mild” phenotype group, it was found that all pathogenic variants are localized before exon 8.
Neurocognitive assessment and DNA sequencing expand the phenotype and genotype spectrum of Alström syndrome / F. Dassie, R. Lorusso, S. Benavides-Varela, G. Milan, F. Favaretto, E. Callus, S. Cagnin, F. Reggiani, G. Minervini, S. Tosatto, R. Vettor, C. Semenza, P. Maffei. - In: AMERICAN JOURNAL OF MEDICAL GENETICS. PART A. - ISSN 1552-4825. - 185A:3(2021 Mar), pp. 732-742.
|Titolo:||Neurocognitive assessment and DNA sequencing expand the phenotype and genotype spectrum of Alström syndrome|
|Parole Chiave:||ALMS; ALMS1; apraxia; mild phenotype; neurocognitive assessment|
|Settore Scientifico Disciplinare:||Settore M-PSI/08 - Psicologia Clinica|
|Data di pubblicazione:||mar-2021|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1002/ajmg.a.62029|
|Appare nelle tipologie:||01 - Articolo su periodico|
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