Neural correlates of executive functions in healthy G2019S LRRK2 mutation carriers

Avner Thaler, Anat Mirelman, Rick C. Helmich, Bart F.L. van Nuenen, Keren Rosenberg-Katz, Tanya Gurevich, Avi Orr-Urtreger, Karen Marder, Susan Bressman, Bastiaan R. Bloem, Nir Giladi, Talma Hendler

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Introduction: The G2019S mutation in the leucine rich repeat kinase 2 (LRRK2) gene is prevalent among Ashkenazi Jewish patients with Parkinson's disease (PD). Cognitive deficits are common in early stage PD. We aimed to characterize the effect of the G2019S mutation on neural mechanisms of executive function processing by testing whether healthy mutation carriers who are an "at risk" population for the future development of PD differed from non-carriers on an functional magnetic resonance imaging (fMRI) Stroop interference task. Methods: Cognitive performance and task related cerebral activity were measured in 40 healthy first-degree relatives of Ashkenazi PD patients (19 carriers and 21 non-carriers of the G2019S mutation). Both regional differences in neural activity and seed region driven functional connectivity methods were performed using fMRI. Results: Compared to non-carriers, mutation carriers had greater baseline deactivation and increased task related activity in the right inferior parietal lobe, right precuneus and right fusiform gyrus. Whole brain functional connectivity analysis revealed stronger coupling between these regions and both basal ganglia structures as well as cortical regions in the carrier group. Non-manifesting G2019S mutation carriers and non-carriers performed similarly on the task and on all other assessed measures, so behavioral differences in task performance and baseline cognitive functions cannot explain the observed imaging differences. Conclusions: G2019S carriers, at risk for developing PD, had similar behavioral performance as non-carriers during the Stroop task, but increased activity in brain regions that have previously been found to be part of the ventral attention system together with stronger coupling between task related areas and structures that make up the ventral and dorsal attention system as well as the basal ganglia-thalamocortical network. This suggests a neural compensatory mechanism that enables intact cognitive performance in asymptomatic mutation carriers.

Original languageEnglish
Pages (from-to)2501-2511
Number of pages11
JournalCortex
Volume49
Issue number9
DOIs
StatePublished - 1 Jan 2013

Keywords

  • Executive functions
  • LRRK2
  • Parkinson's disease
  • Stroop task

ASJC Scopus subject areas

  • Neuropsychology and Physiological Psychology
  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience

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