Epistatic relationship between Waardenburg Syndrome genes MITF and PAX3
- 1 March 1998
- journal article
- letter
- Published by Springer Nature in Nature Genetics
- Vol. 18 (3) , 283-286
- https://doi.org/10.1038/ng0398-283
Abstract
Waardenburg syndrome (WS) is a hereditary disorder that causes hypopigmentation and hearing impairment. Depending on additional symptoms, WS is classified into four types1: WS1, WS2, WS3 and WS4. Mutations in MITF (microphthalmia-associated transcription factor) and PAX3, encoding transcription factors, are responsible for WS2 and WS1/WS3, respectively1. We have previously shown that MITF transactivates the gene for tyrosinase, a key enzyme for melanogenesis, and is critically involved in melanocyte differentiation2. Absence of melanocytes affects pigmentation in the skin, hair and eyes, and hearing function in the cochlea3. Therefore, hypopigmentation and hearing loss in WS2 are likely to be the results of an anomaly of melanocyte differentiation caused by MITF mutations4,5. However, the molecular mechanism by which PAX3 mutations cause the auditory-pigmentary symptoms in WS1/WS3 remains to be explained. Here we show that PAX3, a transcription factor with a paired domain and a homeodomain, transactivates the MITF promoter. We further show that PAX3 proteins associated with WS1 in either the paired domain or the homeodomain fail to recognize and transactivate the MITF promoter. These results provide evidence that PAX3 directly regulates MITF, and suggest that the failure of this regulation due to PAX3 mutations causes the auditory-pigmentary symptoms in at least some individuals with WS1.Keywords
This publication has 21 references indexed in Scilit:
- Waardenburg syndrome.Journal of Medical Genetics, 1997
- Ectopic expression of MITF, a gene for Waardenburg syndrome type 2, converts fibroblasts to cells with melanocyte characteristicsNature Genetics, 1996
- Transcription-Factor Mutations and DiseaseNew England Journal of Medicine, 1996
- The mutational spectrum in Waardenburg syndromeHuman Molecular Genetics, 1995
- Waardenburg syndrome type 2 caused by mutations in the human microphthalmia (MITF) geneNature Genetics, 1994
- Molecular basis of splotch and Waardenburg Pax-3 mutations.Proceedings of the National Academy of Sciences, 1994
- Transcriptional regulation of gene expression: Mechanisms and pathophysiologyHuman Mutation, 1994
- Cochlear disorder associated with melanocyte anomaly in mice with a transgenic insertional mutationMolecular and Cellular Neuroscience, 1992
- An exonic mutation in the HuP2 paired domain gene causes Waardenburg's syndromeNature, 1992
- Waardenburg's syndrome patients have mutations in the human homologue of the Pax-3 paired box geneNature, 1992