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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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The novel mouse microphthalmia mutations Mitfmi-enu5 and Mitfmi-bcc2 produce dominant negative Mitf proteins.

Mutations in the microphthalmia-associated transcription factor (Mitf) gene affect the development of different cell types, including melanocytes, osteoclasts, and retinal pigmented epithelial cells of the eye. Many different mutations at the locus are known and since they affect the phenotype to different extents they form an allelic series. The Mitf protein is a member of the Mitf-Tfe subfamily of basic helix-loop-helix-leucine zipper (bHLH-Zip) transcription factors and binds the 6-bp canonical CAC/TGTG sequence (E box) as either a homodimer or a heterodimer with related proteins. The many Mitf mutations have provided important insights into the in vivo behavior of a bHLH-Zip protein. Here we describe the phenotype of two new semidominant Mitf mutations recovered in recent mutagenic screens, Mitf(mi-enu5) and Mitf(mi-bcc2); determine the molecular lesions involved; and show that the mutant proteins act in a dominant negative fashion in vitro. The novel mutations are phenotypically distinct from previously known Mitf mutations.[1]

References

  1. The novel mouse microphthalmia mutations Mitfmi-enu5 and Mitfmi-bcc2 produce dominant negative Mitf proteins. Hansdottir, A.G., Pálsdóttir, K., Favor, J., Neuhäuser-Klaus, A., Fuchs, H., de Angelis, M.H., Steingrímsson, E. Genomics (2004) [Pubmed]
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