The reeler mutation in the mouse maps to proximal chromosome 5 and defines a key gene involved in brain development and evolution. No gene product is known, and the locus is currently being characterized by positional cloning. YAC clones corresponding to the closest markers D5Mit61 and D5Mit72 have been isolated. Cloned extremities of the YAC inserts were used to construct a 1.1-Mb contig, a 700-kb fragment of which was shown to contain the reeler locus. The integrity of the contig was verified by physical mapping on genomic DNA. The classical allele of the reeler mutation was associated with a 150-kb deletion between D5Mit61 and D5Mit72 , while no gross chromosomal anomaly was found in the Orléans allele. Candidate coding sequences were isolated to construct a preliminary transcriptional map of the reeler region. Cosmid clones mapping within the rl deletion revealed a large transcript of more than 11 kb, which was present in normal embryonic brain but barely detectable in homozygous rl Orl /rl Orl embryonic brain, suggesting strongly that it corresponds to the reeler transcript.
Genomics – Elsevier
Published: Apr 10, 1995
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