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

The value of MLPA in Waardenburg syndrome.

Waardenburg syndrome (WS) is an autosomal-dominant neurocristopathy characterized by sensorineural hearing loss, pigmentary abnormalities of the iris, hair, and skin, and is responsible for about 3% of congenital hearing loss. Point mutations in PAX3 have been identified in more than 90% of affected individuals with WS Type 1/WS Type 3. MITF point mutations have been identified in 10-15% of individuals affected with WS Type 2 (lacking dystopia canthorum). Multiplex ligation-dependent probe amplification (MLPA) is now a standard technology in the molecular genetics laboratory to detect copy number changes in targeted genes. We employed MLPA for PAX3 and MITF in a cohort of patients submitted with a diagnosis of WS1, 2 or 3 who were sequence negative for PAX3 and/or MITF. All coding exons of PAX3 and exons 1, 2, 3, and 10 of MITF were included in the MLPA assay. MLPA on 48 patients with WS 1 or 3 revealed 3 PAX3 whole gene deletions (2 WS1; 1 WS3), 2 PAX3 partial gene deletions [WS1, exon 1 and promoter (1st report); WS1, exons 5-9], and 1 partial MITF deletion ("WS1", exons 3-10) (6/48 approximately 12.5%). MLPA on 41 patients with WS2 and 20 patients submitted with a diagnosis of either WS1 or WS2 revealed no copy number changes. The detection of both partial and whole gene deletions of PAX3/MITF in this clinical cohort increases the mutation detection yield by at least 6% and supports integrating MLPA into clinical molecular testing primarily for patients with WS1 and 3.[1]


  1. The value of MLPA in Waardenburg syndrome. Milunsky, J.M., Maher, T.A., Ito, M., Milunsky, A. Genet. Test. (2007) [Pubmed]
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