Aberrant basal ganglia metabolism in fragile X syndrome: a magnetic resonance spectroscopy study.

Abstract:

BACKGROUND:The profile of cognitive and behavioral variation observed in individuals with fragile X syndrome (FXS), the most common known cause of inherited intellectual impairment, suggests aberrant functioning of specific brain systems. Research investigating animal models of FXS, characterized by limited or lack of fragile X mental retardation protein, (FMRP), has linked brain dysfunction to deficits in the cholinergic and glutamatergic systems. Thus, we sought to examine in vivo levels of neurometabolites related to cholinergic and glutamatergic functioning in males and females with FXS. METHODS:The study participants included 18 adolescents and young adults with FXS, and a comparison group of 18 individuals without FXS matched for age, sex and general intellectual functioning. Proton magnetic resonance spectroscopy (MRS) was used to assess neurometabolite levels in the caudate nucleus, a region known to be greatly enlarged and involved in abnormal brain circuitry in individuals with FXS. A general linear model framework was used to compare group differences in metabolite concentration. RESULTS:We observed a decrease in choline (P = 0.027) and in glutamate + glutamine (P = 0.032) in the caudate nucleus of individuals with FXS, relative to individuals in the comparison group. CONCLUSIONS:This study provides evidence of metabolite differences in the caudate nucleus, a brain region of potential importance to our understanding of the neural deficits underlying FXS. These metabolic differences may be related to aberrant receptor signaling seen in animal models. Furthermore, identification of the specific neurometabolites involved in FXS dysfunction could provide critical biomarkers for the design and efficacy tracking of disease-specific pharmacological treatments.

journal_name

J Neurodev Disord

authors

Bruno JL,Shelly EW,Quintin EM,Rostami M,Patnaik S,Spielman D,Mayer D,Gu M,Lightbody AA,Reiss AL

doi

10.1186/1866-1955-5-20

subject

Has Abstract

pub_date

2013-08-28 00:00:00

pages

20

issue

1

eissn

1866-1947

issn

1866-1955

pii

1866-1955-5-20

journal_volume

5

pub_type

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