E-ISSN 1305-3612
Neuroradiology - Original Article
Abnormal subcortical activity in congenital mirror movement disorder with RAD51 mutation
1 Neuroscience Graduate Program, Bilkent University; A.S. Brain Research Center and National Magnetic Resonance Research Center, Bilkent University, Ankara, Turkey  
2 Department of Molecular Biology and Genetics, Bilkent University, Ankara, Turkey  
3 Department of Psychology, Başkent University, Ankara, Turkey  
4 Department of Genome Sciences, University of Washington, Seattle, WA, USA  
5 Department of Neurology, Akdeniz University, Antalya, Turkey  
6 Department of Neurology, Bezmialem University, İstanbul, Turkey  
7 Neuroscience Graduate Program, Bilkent University; A.S. Brain Research Center and National Magnetic Resonance Research Center;Department of Psychology, Bilkent University, Ankara, Turkey;Department of Psychology, JL Giessen University, Giessen, Germany  
Diagn Interv Radiol ; : -

Abstract

 

PURPOSE: Congenital mirror movement disorder (CMMD) is characterized by unintended, non-suppressible, homologous mirroring activity contralateral to the movement on the intended side of the body. In healthy controls, unilateral movements are accompanied with predominantly contralateral cortical activity. Whereas in CMMD, in-line with the abnormal behavior, bilateral cortical activity is observed for unilateral motor tasks. However, task-related activities in subcortical structures, which are known to play critical roles in motor actions, have not been investigated in CMMD previously.

 

METHODS: In this sense, we investigated the functional activation patterns of the motor components in CMMD patients. By using linkage analysis and exome sequencing common mutations were revealed in seven affected individuals from the same family. Next, using functional magnetic resonance imaging (fMRI) we investigated cortical and subcortical activity during manual motor actions in two right-handed affected brothers and sex-, age-, education- and socioeconomic-matched healthy individuals.

 

RESULTS: Genetic analyses revealed heterozygous RAD51 C.401C>T mutation which cosegregated with the phenotype in two affected members of the family. Consistent with previous literature, our fMRI results on these two affected individuals showed that mirror movements were closely related to abnormal cortical activity in M1 and SMA during unimanual movements. Furthermore, we have found previously unknown abnormal task-related activity in subcortical structures. Specifically, we have found increased and bilateral activity during unimanual movements in thalamus, striatum, and globus pallidus in patients.

 

CONCLUSION: These findings reveal further neural correlates of CMMD, and may guide our understanding of the critical roles of subcortical structures for unimanual movements in healthy individuals.

 

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