Autosomal dominant familial dyskinesia and facial myokymia: Single exome sequencing identifies a mutation in adenylyl cyclase 5

Ying Zhang Chen, Mark M. Matsushita, Peggy Robertson, Mark Rieder, Santhosh Girirajan, Francesca Antonacci, Hillary Lipe, Evan E. Eichler, Deborah A. Nickerson, Thomas D. Bird, Wendy H. Raskind

Research output: Contribution to journalArticle

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Abstract

Background: Familial dyskinesia with facial myokymia (FDFM) is an autosomal dominant disorder that is exacerbated by anxiety. In a 5-generation family of German ancestry, we previously mapped FDFM to chromosome band 3p21-3q21. The 72.5-Mb linkage region was too large for traditional positional mutation identification. Objective: To identify the gene responsible for FDFM by exome resequencing of a single affected individual. Participants: We performed whole exome sequencing in 1 affected individual and used a series of bioinformatic filters, including functional significance and presence in dbSNP or the 1000 Genomes Project, to reduce the number of candidate variants. Co-segregation analysis was performed in 15 additional individuals in 3 generations. Main Outcome Measures: Unique DNA variants in the linkage region that co-segregate with FDFM. Results: The exome contained 23 428 single-nucleotide variants, of which 9391 were missense, nonsense, or splice site alterations. The critical region contained 323 variants, 5 ofwhich were not present in 1 of the sequence databases. Adenylyl cyclase 5 (ADCY5) was the only gene in which the variant (c.2176G>A) was co-transmitted perfectly with disease status and was not present in 3510 control white exomes. This residue is highly conserved, and the change is nonconservative and predicted to be damaging. Conclusions: ADCY5 is highly expressed in striatum. Mice deficient in Adcy5 develop a movement disorder that is worsened by stress. We conclude that FDFM likely results from a missense mutation in ADCY5. This study demonstrates the power of a single exome sequence combined with linkage information to identify causative genes for rare autosomal dominant mendelian diseases.

Original languageEnglish (US)
Pages (from-to)630-635
Number of pages6
JournalArchives of Neurology
Volume69
Issue number5
DOIs
StatePublished - May 1 2012

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Clinical Neurology

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    Chen, Y. Z., Matsushita, M. M., Robertson, P., Rieder, M., Girirajan, S., Antonacci, F., Lipe, H., Eichler, E. E., Nickerson, D. A., Bird, T. D., & Raskind, W. H. (2012). Autosomal dominant familial dyskinesia and facial myokymia: Single exome sequencing identifies a mutation in adenylyl cyclase 5. Archives of Neurology, 69(5), 630-635. https://doi.org/10.1001/archneurol.2012.54