Mutations of MYO6 Are Associated with Recessive Deafness, DFNB37

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Mutations of MYO6 Are Associated with Recessive Deafness, DFNB37 Zubair M. Ahmed, Robert J. Morell, Saima Riazuddin, Andrea Gropman, Shahzad Shaukat, Mussaber M. Ahmad, Saidi A. Mohiddin, Lameh Fananapazir, Rafael C. Caruso, Tayyab Husnain, Shaheen N. Khan, Sheikh Riazuddin, Andrew J. Griffith, Thomas B. Friedman, Edward R. Wilcox The American Journal of Human Genetics Volume 72, Issue 5, Pages 1315-1322 (May 2003) DOI: 10.1086/375122 Copyright © 2003 The American Society of Human Genetics Terms and Conditions

Figure 1 Haplotypes of markers showing linkage to DFNB37 at 6q13 for three families segregating profound, sensorineural, recessive hearing loss. Affected individual IV:17 in family PKDF10 provided the proximal recombination breakpoint at marker D6S1282 (82.59 cM). The distal recombination is provided by affected individual IV:10 of family PKDF71 at marker D6S1031 (88.63 cM). National Institutes of Health (OH93-N-016) and National Centre of Excellence in Molecular Biology (CEMB) institutional review board approval and written informed consent were obtained from all participating subjects. DNA was extracted from either peripheral blood samples or buccal swabs and was amplified using fluorescent-labeled primers for STR markers linked to reported nonsyndromic recessive deafness (DFNB) loci. Amplimers were visualized by gel electrophoresis on ABI 377 DNA sequencers, and genotypes were determined using Genescan and Genotyper software (Applied Biosystems). The genetic linkage distances are from the Center for Medical Genetics Web server. The American Journal of Human Genetics 2003 72, 1315-1322DOI: (10.1086/375122) Copyright © 2003 The American Society of Human Genetics Terms and Conditions

Figure 2 MYO6 mutations segregating in three Pakistani families. Left, Electropherograms of amplimers from genomic DNA templates, illustrating homozygosity for a single-base-pair insertion mutation in an affected individual, heterozygosity in an obligate carrier, and homozygosity for the wild-type allele in an unaffected individual from family PKDF10. An arrow indicates the site of the 36-37insT in the second exon. Center, Electropherograms illustrating genotypes of a homozygous wild-type allele, a 3496C→T heterozygote, and a person homozygous for 3496C→T of family PKDF71. Right, Electropherograms are shown for transversion mutation 647A→T, a carrier, and the wild-type allele of family PKSR14. All the mutations described here are numbered from start codon ATG (GenBank accession number AB002387). The American Journal of Human Genetics 2003 72, 1315-1322DOI: (10.1086/375122) Copyright © 2003 The American Society of Human Genetics Terms and Conditions

Figure 3 A drawing of myosin VI, showing the locations of the mutations causing deafness in humans and mice. The three mutant alleles reported in this study are shown in bold letters, whereas C442Y and 2456-2585del are from the studies by Melchionda et al. (2001) and Avraham et al. (1995), respectively. Shown also is the predicted stop codon after twelve out-of-frame amino acids due to 36-37insT. The American Journal of Human Genetics 2003 72, 1315-1322DOI: (10.1086/375122) Copyright © 2003 The American Society of Human Genetics Terms and Conditions

Figure 4 Alignment of a portion of myosin VI proteins from various species, showing conservation of the glutamate residue at position 216 in the motor domain among seven myosin VI proteins from Homo sapiens, Mus musculus, Rana catesbeiana, Sus scrofa, Gallus gallus, Morone saxatilis, and Strongylocentrotus. The conserved amino acids are shown with dark gray background, similar amino acids are shown with a light gray background, and the nonconserved amino acids are shown with a white background. The American Journal of Human Genetics 2003 72, 1315-1322DOI: (10.1086/375122) Copyright © 2003 The American Society of Human Genetics Terms and Conditions