Abstract:
:Autosomal dominant hereditary spastic paraplegia (AD-HSP) is a genetically heterogeneous disorder characterized by progressive spasticity of the lower limbs. A major locus (SPG4) causing AD-HSP in about 40% of the families was mapped to chromosome 2p. The analysis of six SPG4-linked AD-HSP families using the RED procedure previously showed the expansion of a CAG repeat in affected individuals. To identify the gene responsible for this form of HSP, we have constructed a 3.5-Mb YAC contig flanked by loci D2S400 and D2S367, have subcloned five of these YACs spanning the candidate region into cosmids, and screened these cosmid libraries for the presence of CAG repeat sequences. Four CAG repeats have been identified but none of them is expanded in 26 patients from 13 SPG4-linked AD-HSP families. A gene map comprising 21 transcripts was established using expressed sequence tags (ESTs) assigned previously to this region of 2p21-p22 with radiation hybrid panels GeneBridge 4 and G3. Full-length cDNAs corresponding to the 14 ESTs mapping to the SPG4 interval flanked by loci D2S352 and D2S2347 were isolated and sequenced. None contains a CAG repeat in its coding sequence. Finally, we have assembled a BAC contig composed of 37 clones that were also screened for the presence of CAG repeats; this failed to detect additional repeats to those identified on YACs.
journal_name
Genomicsjournal_title
Genomicsauthors
Hazan J,Davoine CS,Mavel D,Fonknechten N,Paternotte C,Fizames C,Cruaud C,Samson D,Muselet D,Vega-Czarny N,Brice A,Gyapay G,Heilig R,Fontaine B,Weissenbach Jdoi
10.1006/geno.1999.5932subject
Has Abstractpub_date
1999-09-15 00:00:00pages
309-19issue
3eissn
0888-7543issn
1089-8646pii
S0888-7543(99)95932-3journal_volume
60pub_type
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