Fine-mapping of the spinal muscular atrophy locus to a region flanked by MAP1B and D5S6.
The microtubule-associated protein 1B (MAP1B) locus has been mapped in close proximity to spinal muscular atrophy (SMA) on chromosome 5q13. We have identified a second microsatellite within a MAP1B intron, which increases the heterozygosity of this locus to 94%. Two unambiguous recombination events establish MAP1B as a closely linked, distal flanking marker for the disease locus, while a third recombinant establishes D5S6 as the proximal flanking marker. The combination of key recombinants an...Expand abstract
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