Clinical and genetic study of a large Italian family linked to SPG12 locus.

Abstract:

BACKGROUND:Seven loci for autosomal dominant hereditary spastic paraplegia (ADHSP) have been mapped. To date, two families of SPG12 (chromosome 19q13) have been analyzed; however, there is not enough clinical information on SPG12 to establish locus-phenotype correlations. METHODS:The authors studied 60 individuals from a large Italian family with ADHSP, in which 16 members in four generations were affected. They performed genetic linkage analysis with DNA markers from currently known ADHSP loci. After database searching, one candidate gene for SPG12 was analyzed by sequencing. RESULTS:The patients in this family showed an early onset and rapid progression of symptoms, resulting in severe disability, with a large proportion of affected members requiring use of a wheelchair. By age 16, most patients had sensory disturbance. Evidence for linkage to the SPG12 locus was obtained. Obligate recombination events observed in this family have narrowed the SPG12 locus from the 16.1 cM to 11.3 cM region between markers D19S416 and D19S412. In combination with previous genetic studies, the SPG12 locus was further narrowed to the 3.3 cM region between D19S416 and D19S220. A homologue of the AAA (ATPases associated with a variety of cellular activities) protein family, proteasome 26S subunit ATPase mapped near D19S220, was excluded by sequencing. CONCLUSIONS:This study refined the SPG12 region between D19S416 and D19S220 and revealed several clinical characteristics-early onset, rapid progression, and involvement of sensory disturbance-that may be unique to SPG12. Suggestive evidence of genetic anticipation was obtained, but should be confirmed in other SPG12 families.

journal_name

Neurology

journal_title

Neurology

authors

Orlacchio A,Kawarai T,Rogaeva E,Song YQ,Paterson AD,Bernardi G,St George-Hyslop PH

doi

10.1212/01.wnl.0000031423.43482.19

subject

Has Abstract

pub_date

2002-11-12 00:00:00

pages

1395-401

issue

9

eissn

0028-3878

issn

1526-632X

journal_volume

59

pub_type

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