Congenital mirror movements
Mutational analysis of RAD51 and DCC in 26 cases
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Abstract
Objective: We screened a large series of individuals with congenital mirror movements (CMM) for mutations in the 2 identified causative genes, DCC and RAD51.
Methods: We studied 6 familial and 20 simplex CMM cases. Each patient had a standardized neurologic assessment. Analysis of DCC and RAD51 coding regions included Sanger sequencing and a quantitative method allowing detection of micro rearrangements. We then compared the frequency of rare variants predicted to be pathogenic by either the PolyPhen-2 or the SIFT algorithm in our population and in the 4,300 controls of European origin on the Exome Variant Server.
Results: We found 3 novel truncating mutations of DCC that segregate with CMM in 4 of the 6 families. Among the 20 simplex cases, we found one exonic deletion of DCC, one DCC mutation leading to a frameshift, 5 missense variants in DCC, and 2 missense variants in RAD51. All 7 missense variants were predicted to be pathogenic by one or both algorithms. Statistical analysis showed that the frequency of variants predicted to be deleterious was significantly different between patients and controls (p < 0.001 for both RAD51 and DCC).
Conclusion: Mutations and variants in DCC and RAD51 are strongly associated with CMM, but additional genes causing CMM remain to be discovered.
GLOSSARY
- CMM=
- congenital mirror movements;
- dbSNP=
- Single Nucleotide Polymorphism Database;
- DCC=
- deleted in colorectal carcinoma;
- EVS=
- Exome Variant Server;
- MM=
- mirror movements;
- OMIM=
- Online Mendelian Inheritance in Man;
- RAD51=
- RAD51 recombinase
Footnotes
Go to Neurology.org for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article.
↵* These authors contributed equally to this work.
Supplemental data at Neurology.org
- Received November 17, 2013.
- Accepted in final form February 26, 2014.
- © 2014 American Academy of Neurology
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