Structural and microstructural neuroimaging signature of C9orf72-associated ALS: A multiparametric MRI study

被引:2
|
作者
Wiesenfarth, Maximilian [1 ]
Huppertz, Hans-Juergen [2 ]
Dorst, Johannes [1 ,3 ]
Lule, Dorothee [1 ]
Ludolph, Albert C. [1 ,3 ]
Mueller, Hans-Peter [1 ]
Kassubek, Jan [1 ,3 ,4 ]
机构
[1] Univ Hosp Ulm, Dept Neurol, Ulm, Germany
[2] Klin Lengg, Swiss Epilepsy Clin, Zurich, Switzerland
[3] German Ctr Neurodegenerat Dis DZNE, Ulm, Germany
[4] Univ Hosp Ulm, Dept Neurol, Oberer Eselsberg 45, D-89081 Ulm, Germany
关键词
Diffusion tensor imaging; Atlas-based volumetry; Amyotrophic lateral sclerosis; C9orf72; expansion; Magnetic resonance imaging; Motor neuron disease; HEXANUCLEOTIDE REPEAT; C9ORF72; DEGENERATION; EXPANSION; PATHOLOGY; FTD; NEUROFILAMENTS; VOLUMETRY; SPECTRUM; DISEASES;
D O I
10.1016/j.nicl.2023.103505
中图分类号
R445 [影像诊断学];
学科分类号
100207 ;
摘要
Background: ALS patients with hexanucleotide expansion in C9orf72 are characterized by a specific clinical phenotype, including more aggressive disease course and cognitive decline. Computerized multiparametric MRI with gray matter volumetry and diffusion tensor imaging (DTI) to analyze white matter structural connectivity is a potential in vivo biomarker.Objective: The objective of this study was to develop a multiparametric MRI signature in a large cohort of ALS patients with C9orf72 mutations. The aim was to investigate how morphological features of C9orf72-associated ALS differ in structural MRI and DTI compared to healthy controls and ALS patients without C9orf72 mutations.Methods: Atlas-based volumetry (ABV) and whole brain-based DTI-based analyses were performed in a cohort of n = 51 ALS patients with C9orf72 mutations and compared with both n = 51 matched healthy controls and n = 51 C9orf72 negative ALS patients, respectively. Subsequently, Spearman correlation analysis of C9orf72 ALS patients' data with clinical parameters (age of onset, sex, ALS-FRS-R, progression rate, survival) as well as ECAS and p-NfH in CSF was performed.Results: The whole brain voxel-by-voxel comparison of fractional anisotropy (FA) maps between C9orf72 ALS patients and controls showed significant bilateral alterations in axonal structures of the white matter at group level, primarily along the corticospinal tracts and in fibers projecting to the frontal lobes. For the frontal lobes, these alterations were also significant between C9orf72 positive and C9orf72 negative ALS patients. In ABV, patients with C9orf72 mutations showed lower volumes of the frontal, temporal, and parietal lobe, with the lowest values in the gray matter of the superior frontal and the precentral gyrus, but also in hippocampi and amygdala. Compared to C9orf72 negative ALS, the differences were shown to be significant for cerebral gray matter (p = 0.04), especially in the frontal (p = 0.01) and parietal lobe (p = 0.01), and in the thalamus (p = 0.004). A correlation analysis between ECAS and averaged regional FA values revealed significant correlations between cognitive performance in ECAS and frontal association fibers. Lower FA values in the frontal lobes were associated with worse performance in all cognitive domains measured (language, verbal fluency, executive functions, memory and spatial perception). In addition, there were significant negative correlations between age of onset and atlas-based volumetry results for gray matter.Conclusions: This study demonstrates a distinct pattern of DTI alterations of the white matter and ubiquitous volume reductions of the gray matter early in the disease course of C9orf72-associated ALS. Alterations were
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页数:12
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