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Characterization and mapping of the mouse NDP (Norrie disease) locus (Ndp)

Characterization and mapping of the mouse NDP (Norrie disease) locus (Ndp)

Mammalian Genome 7(2): 93-97

Norrie disease is a severe X-linked recessive neurological disorder characterized by congenital blindness with progressive loss of hearing. Over half of Norrie patients also manifest different degrees of mental retardation. The gene for Norrie disease (NDP) has recently been cloned and characterized. With the human NDP cDNA, mouse genomic phage libraries were screened for the homolog of the gene. Comparison between mouse and human genomic DNA blots hybridized with the NDP cDNA, as well as analysis of phage clones, shows that the mouse NDP gene is 29 kb in size (28 kb for the human gene). The organization in the two species is very similar. Both have three exons with similar-sized introns and identical exon-intron boundaries between exon 2 and 3. The mouse open reading frame is 393 bp and, like the human coding sequence, is encoded in exons 2 and 3. The absence of six nucleotides in the second mouse exon results in the encoded protein being two amino acids smaller than its human counterpart. The overall homology between the human and mouse NDP protein is 95% and is particularly high (99%) in exon 3, consistent with the apparent functional importance of this region. Analysis of transcription initiation sites suggests the presence of multiple start sites associated with expression of the mouse NDP gene. Pedigree analysis of an interspecific mouse backcross localizes the mouse NDP gene close to Maoa in the conserved segment, which runs from CYBB to PFC in both human and mouse.

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Accession: 002775049

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PMID: 8835523

DOI: 10.1007/s003359900026

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