Abstract:
BACKGROUND:Hereditary neuralgic amyotrophy (HNA) is an autosomal dominant disorder that manifests as recurrent, episodic, painful brachial neuropathies. A gene for HNA maps to chromosome 17q25.3 where mutations in SEPT9, encoding the septin-9 protein, have been identified. OBJECTIVE:To determine the frequency and type of mutations in the SEPT9 gene in a new cohort of 42 unrelated HNA pedigrees. METHODS:DNA sequencing of all exons and intron-exon boundaries for SEPT9 was carried out in an affected individual in each pedigree from our HNA cohort. Genotyping using microsatellite markers spanning the SEPT9 gene was also used to identify pedigrees with a previously reported founder haplotype. RESULTS:Two missense mutations were found: c.262C>T (p.Arg88Trp) in seven HNA pedigrees and c.278C>T (p.Ser93Phe) in one HNA pedigree. Sequencing of other known exons in SEPT9 detected no additional disease-associated mutations. A founder haplotype, without defined mutations in SEPT9, was present in seven pedigrees. CONCLUSIONS:We provide further evidence that mutation of the SEPT9 gene is the molecular basis of some cases of hereditary neuralgic amyotrophy (HNA). DNA sequencing of SEPT9 demonstrates a restricted set of mutations in this cohort of HNA pedigrees. Nonetheless, sequence analysis will have an important role in mutation detection in HNA. Additional techniques will be required to find SEPT9 mutations in an HNA founder haplotype and other pedigrees.
journal_name
Neurologyjournal_title
Neurologyauthors
Hannibal MC,Ruzzo EK,Miller LR,Betz B,Buchan JG,Knutzen DM,Barnett K,Landsverk ML,Brice A,LeGuern E,Bedford HM,Worrall BB,Lovitt S,Appel SH,Andermann E,Bird TD,Chance PFdoi
10.1212/WNL.0b013e3181a609e3subject
Has Abstractpub_date
2009-05-19 00:00:00pages
1755-9issue
20eissn
0028-3878issn
1526-632Xpii
72/20/1755journal_volume
72pub_type
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