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Cognitive, medical, and neuroimaging characteristics of attenuated mucopolysaccharidosis type II.

Abstract：

UNLABELLED:The phenotype of attenuated mucopolysaccharidosis type II (MPS II), also called Hunter syndrome, has not been previously studied in systematic manner. In contrast to the "severe" phenotype, the "attenuated" phenotype does not present with behavioral or cognitive impairment; however, the presence of mild behavior and cognitive impairment that might impact long-term functional outcomes is unknown. Previously, significant MRI abnormalities have been found in MPS II. Recent evidence suggests white matter abnormalities in many MPS disorders. METHODS:As the initial cross-sectional analysis of a longitudinal study, we studied the association of brain volumes and somatic disease burden with neuropsychological outcomes, including measures of intelligence, memory, and attention in 20 patients with attenuated MPS II with a mean age of 15.8. MRI volumes were compared to 55 normal controls. RESULTS:While IQ and memory were average, measures of attention were one standard deviation below the average range. Corpus callosum volumes were significantly different from age-matched controls, differing by 22%. Normal age-related volume increases in white matter were not seen in MPS II patients as they were in controls. Somatic disease burden and white matter and corpus callosum volumes were significantly associated with attention deficits. Neither age at evaluation nor age at starting treatment predicted attention outcomes. CONCLUSIONS:Despite average intelligence, attention is compromised in attenuated MPS II. Results confirm an important role of corpus callosum and cortical white matter abnormality in MPS II as well as the somatic disease burden in contributing to attention difficulties. Awareness by the patient and caregivers with appropriate management and symptomatic support will benefit the attenuated MPS II patient.

journal_name

Mol Genet Metab

journal_title

Molecular genetics and metabolism

authors

Yund B,Rudser K,Ahmed A,Kovac V,Nestrasil I,Raiman J,Mamak E,Harmatz P,Steiner R,Lau H,Vekaria P,Wozniak JR,Lim KO,Delaney K,Whitley C,Shapiro EG

doi

10.1016/j.ymgme.2014.12.299

subject

Has Abstract

pub_date

2015-02-01 00:00:00

pages

170-7

issue

2

eissn

1096-7192

issn

1096-7206

pii

S1096-7192(14)00679-9

journal_volume

114

pub_type

临床试验,杂志文章,多中心研究

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