Abstract
We report of a spinocerebellar ataxia (SCA)27 in a daughter and her mother whose karyotype is 46, XX t(5;13)(q31.2;q33.1). The translocation breakpoint is identical in both patients, disrupting the gene-encoding fibroblast growth factor 14 isoform b (FGF14-1b). Clinically, both show signs of SCA, although the daughter is the most affected with early onset cerebellar ataxia, microcephaly, and severe mental retardation. FGF14-1b is the predominant isoform in brain, where it interacts with the voltage gated Na channel. Fgf14−/− mice develop ataxia and paroxysmal dyskinesia and have cognitive deficits. One missense and one non-sense mutation in FGF14 have previously been linked to SCA27. Truncation of one allele in our patients suggests that haploinsuffiency of FGF14 can cause SCA27.
References
Wang Q, Mcewen DG, Ornitz DM (2000) Subcellular and developmental expression of alternatively spliced forms of fibroblast growth factor 14. Mech Develop 90:283–287. doi:1016/S0925-4773(99)00241-5
Brusse E, de Koning I, Maat-Kievit A et al (2006) Spinocerebellar ataxia associated with a mutation in the fibroblast growth factor 14 gene (SCA27): a new phenotype. Mov Disord 21:396–401. doi:10.1002/mds.20708
Dalski A, Atici J, Kreuz FR et al (2005) Mutation analysis in the fibroblast growth factor 14 gene: frameshift mutation and polymorphisms in patients with inherited ataxias. Eur J Hum Genet 13:118–120. doi:10.1038/sj.ejhg.5201286
van Swieten JC, Brusse E, de Graaf BM et al (2003) A mutation in the fibroblast growth factor 14 gene is associated with autosomal dominant cerebral ataxia. Am J Hum Genet 72:191–199. doi:10.1086/345488
Smallwood PM, MunozSanjuan I, Tong P et al (1996) Fibroblast growth factor (FGF) homologous factors: new members of the FGF family implicated in nervous system development. Proc Natl Acad Sci 93:9850–9857. doi:10.1073/pnas.93.18.9850
Wang Q, Bardgett ME, Wong M et al (2002) Ataxia and paroxysmal dyskinesia in mice lacking axonally transported FGF14. Neuron 35:25–38. doi:1016/S0896-6273(02)00744-4
Laezza F, Gerber BR, Lou JY et al (2007) The FGF14(F145S) mutation disrupts the interaction of FGF14 with voltage-gated Na+ channels and impairs neuronal excitability. J Neurosci 27:12033–12044. doi:10.1523/jneurosci.2282-07.2007
Wozniak DF, Xiao M, Xu L et al (2007) Impaired spatial learning and defective theta burst induced LTP in mice lacking fibroblast growth factor 14. Neurobiol Dis 26:14–26. doi:10.1016/j.nbd.2006.11.014
Acknowledgments
We thank the family for their collaboration and contribution to this study. We are indebted to Eli Ormerod who performed the G-banding. This work was founded by project support from the University of Oslo. DM and EF were supported by “Sigurd K. Thoresens Foundation”, “University of Oslo Research Fund (UNIFOR)”, and “Ullevål University Hospital Research Fund (VIRUUS)”.
Author information
Authors and Affiliations
Corresponding authors
Electronic supplementary material
Below is the link to the electronic supplementary material.
Supplementary Table 1
Genomic clones used as probes in the FISH experiments (XLS 28.5 kb)
Supplementary Table 2
PCR primers used to sequence the chromosome translocation breakpoints (XLS 29.0 kb)
Supplementary Table 3
PCR primers used to sequence the FGF14-1b alleles (XLS 25.5 kb)
Video of the proband showing the gait ataxia. The proband demonstrating cerebellar dysfunction with gross truncal ataxia accompanied by coarse tremor in the arms. She has an open mouth and a tendency to drool (MPG 5533 kb)
Video showing the unsteadiness in the mother. The mother displays unsteadiness when asked to stand on one foot at a time with closed eyes. She has slender legs and high arched feet. (MPG 3344 kb)
Rights and permissions
About this article
Cite this article
Misceo, D., Fannemel, M., Barøy, T. et al. SCA27 caused by a chromosome translocation: further delineation of the phenotype. Neurogenetics 10, 371–374 (2009). https://doi.org/10.1007/s10048-009-0197-x
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10048-009-0197-x