Usher syndrome type III is an autosomal recessive disorder characterized by progressive sensorine... more Usher syndrome type III is an autosomal recessive disorder characterized by progressive sensorineural hearing loss, vestibular dysfunction, and retinitis pigmentosa. The disease gene was localized to 3q25 and recently was identified by positional cloning. In the present study, we have revised the structure of the USH3 gene, including a new translation start site, 5 untranslated region, and a transcript encoding a 232-amino acid protein. The mature form of the protein is predicted to contain three transmembrane domains and 204 residues. We have found four new disease-causing mutations, including one that appears to be relatively common in the Ashkenazi Jewish population. We have also identified mouse (chromosome 3) and rat (chromosome 2) orthologues, as well as two human paralogues on chromosomes 4 and 10. ) is unique among the clinical subtypes of Usher syndrome, in that it shows postlingual, progressive hearing loss and late onset of retinitis pigmentosa (RP), as well as a progressive loss of vestibular function . The disease locus was originally mapped to chromosome 3q25, between the markers WI-17533 and 486D12SP6, a region of ∼700 kb . In a recent publication , the USH3 locus was assigned to a region of 250 kb between 107G19CA7 and D3S3625, by means of haplotype and linkage disequilibrium analyses in Finnish carriers of the putative founder mutation. A region near-but outside of-this partially sequenced (GenBank accession number AF388363) 250-kb critical region was subsequently reported to contain USH3A
Chondroid lipoma, a rare benign adipose tissue tumor, may histologically resemble myxoid liposarc... more Chondroid lipoma, a rare benign adipose tissue tumor, may histologically resemble myxoid liposarcoma or extraskeletal myxoid chondrosarcoma, but is genetically distinct. In the current study, an identical reciprocal translocation, t(11;16)(q13;p13) was identified in three chondroid lipomas, a finding consistent with previous isolated reports. A fluorescence in situ hybridization (FISH)-based positional cloning strategy using a series of bacterial artificial chromosome (BAC) probe combinations designed to narrow the 16p13 breakpoint revealed MKL2 as the candidate gene. Subsequent 5′ RACE studies demonstrated C11orf95 as the MKL2 fusion gene partner. MKL/myocardin-like 2 (MKL2) encodes myocardin-related transcription factor B (MRTF-B) in a megakaryoblastic leukemia gene family, and C11orf95 (chromosome 11 open reading frame 95) is a hypothetical protein. Sequencing analysis of RT-PCR generated transcripts from all three chondroid lipomas defined the fusion as occurring between exons 5 and 9 of C11orf95 and MKL2, respectively. Dual-color breakpoint spanning probe sets custom-designed for recognition of the translocation event in interphase cells confirmed the anticipated rearrangements of the C11orf95 and MKL2 loci in all cases. The FISH and RT-PCR assays developed in this study can serve as diagnostic adjuncts for identification of this novel C11orf95-MKL2 fusion oncogene in chondroid lipoma.
Usher syndrome type III is an autosomal recessive disorder characterized by progressive sensorine... more Usher syndrome type III is an autosomal recessive disorder characterized by progressive sensorineural hearing loss, vestibular dysfunction, and retinitis pigmentosa. The disease gene was localized to 3q25 and recently was identified by positional cloning. In the present study, we have revised the structure of the USH3 gene, including a new translation start site, 5 untranslated region, and a transcript encoding a 232-amino acid protein. The mature form of the protein is predicted to contain three transmembrane domains and 204 residues. We have found four new disease-causing mutations, including one that appears to be relatively common in the Ashkenazi Jewish population. We have also identified mouse (chromosome 3) and rat (chromosome 2) orthologues, as well as two human paralogues on chromosomes 4 and 10. ) is unique among the clinical subtypes of Usher syndrome, in that it shows postlingual, progressive hearing loss and late onset of retinitis pigmentosa (RP), as well as a progressive loss of vestibular function . The disease locus was originally mapped to chromosome 3q25, between the markers WI-17533 and 486D12SP6, a region of ∼700 kb . In a recent publication , the USH3 locus was assigned to a region of 250 kb between 107G19CA7 and D3S3625, by means of haplotype and linkage disequilibrium analyses in Finnish carriers of the putative founder mutation. A region near-but outside of-this partially sequenced (GenBank accession number AF388363) 250-kb critical region was subsequently reported to contain USH3A
Chondroid lipoma, a rare benign adipose tissue tumor, may histologically resemble myxoid liposarc... more Chondroid lipoma, a rare benign adipose tissue tumor, may histologically resemble myxoid liposarcoma or extraskeletal myxoid chondrosarcoma, but is genetically distinct. In the current study, an identical reciprocal translocation, t(11;16)(q13;p13) was identified in three chondroid lipomas, a finding consistent with previous isolated reports. A fluorescence in situ hybridization (FISH)-based positional cloning strategy using a series of bacterial artificial chromosome (BAC) probe combinations designed to narrow the 16p13 breakpoint revealed MKL2 as the candidate gene. Subsequent 5′ RACE studies demonstrated C11orf95 as the MKL2 fusion gene partner. MKL/myocardin-like 2 (MKL2) encodes myocardin-related transcription factor B (MRTF-B) in a megakaryoblastic leukemia gene family, and C11orf95 (chromosome 11 open reading frame 95) is a hypothetical protein. Sequencing analysis of RT-PCR generated transcripts from all three chondroid lipomas defined the fusion as occurring between exons 5 and 9 of C11orf95 and MKL2, respectively. Dual-color breakpoint spanning probe sets custom-designed for recognition of the translocation event in interphase cells confirmed the anticipated rearrangements of the C11orf95 and MKL2 loci in all cases. The FISH and RT-PCR assays developed in this study can serve as diagnostic adjuncts for identification of this novel C11orf95-MKL2 fusion oncogene in chondroid lipoma.
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