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TL;DR: Criteria for distinguishing these two disorders by a combination of mutation detection and GlcNAc-phosphotransferase activity determination is proposed and it is possible to confidently distinguish these two clinically related but distinct diseases.
Abstract: Mucolipidosis II (MLII; I-cell disease) and mucolipidosis IIIA (MLIIIA; classical pseudo-Hurler polydystrophy) are diseases in which the activity of the uridine diphosphate (UDP)–N-acetylglucosamine:lysosomal enzyme N-acetylglucosamine-1-phosphotransferase (GlcNAc-phosphotransferase) is absent or reduced, respectively. In the absence of mannose phosphorylation, trafficking of lysosomal hydrolases to the lysosome is impaired. In these diseases, mistargeted lysosomal hydrolases are secreted into the blood, resulting in lysosomal deficiency of many hydrolases and a storage-disease phenotype. To determine whether these diseases are caused by mutations in the GlcNAc-phosphotransferase α/β–subunits precursor gene (GNPTAB), we sequenced GNPTAB exons and flanking intronic sequences and measured GlcNAc-phosphotransferase activity in patient fibroblasts. We identified 15 different mutations in GNPTAB from 18 pedigrees with MLII or MLIIIA and demonstrated that these two diseases are allelic. Mutations in both alleles were identified in each case, which demonstrated that GNPTAB mutations are the cause of both diseases. Some pedigrees had identical mutations. One frameshift mutation (truncation at amino acid 1171) predominated and was found in both MLII and MLIIIA. This mutation was found in combination with severe mutations (i.e., mutations preventing the generation of active enzyme) in MLII and with mild mutations (i.e., mutations allowing the generation of active enzyme) in MLIIIA. Some cases of MLII and MLIIIA were the result of mutations that cause aberrant splicing. Substitutions were inside the invariant splice-site sequence in MLII and were outside it in MLIIIA. When the mutations were analyzed along with GlcNAc-phosphotransferase activity, it was possible to confidently distinguish these two clinically related but distinct diseases. We propose criteria for distinguishing these two disorders by a combination of mutation detection and GlcNAc-phosphotransferase activity determination.
144 citations
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TL;DR: The relatively early expression of cartilage specific markers by the implanted chondrocytes, coupled with the inability of untreated chondral defects to repair or regenerate, demonstrates the utility of the canine model in evaluating novel materials for cartilage repair and regeneration.
144 citations
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TL;DR: Symptom duration was identified as the best predictor of the extent of skeletal and respiratory muscle weakness and outcome measures were demonstrated to be safe and reliable.
Abstract: The objective of this 12-month study was to describe the clinical features of late-onset Pompe disease and identify appropriate outcome measures for use in clinical trials. Assessments included quantitative muscle testing (QMT), functional activities (FAA), 6-min walk test (6MWT), and pulmonary function testing (PFT). Percent predicted values indicated quantifiable upper and lower extremity weakness, impaired walking ability, and respiratory muscle weakness. Significant declines in arm and leg strength and pulmonary function were observed during the study period. The outcome measures were demonstrated to be safe and reliable. Symptom duration was identified as the best predictor of the extent of skeletal and respiratory muscle weakness.
143 citations
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TL;DR: Can mucopolysaccharidosis type I disease severity be predicted based on a patient’s genotype?
143 citations
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TL;DR: In this article, the authors identify tuberin as a determinant of polycystin-1 functional localization and, potentially, ADPKD severity in rat renal cells, showing that tuberin-deficient cells exhibited loss of lateral membrane localization.
143 citations
Authors
Showing all 3085 results
Name | H-index | Papers | Citations |
---|---|---|---|
George M. Whitesides | 240 | 1739 | 269833 |
Stephen J. O'Brien | 153 | 1062 | 93025 |
Robert B. Jackson | 132 | 458 | 91332 |
Glenn M. Chertow | 128 | 764 | 82401 |
Jon Clardy | 116 | 983 | 56617 |
John J. Fung | 115 | 1011 | 52924 |
Robert B. Colvin | 111 | 556 | 52034 |
Sergio Giralt | 109 | 1024 | 48513 |
Paul Saftig | 107 | 356 | 49929 |
Robert J. Desnick | 102 | 694 | 39698 |
Robert A. Soslow | 87 | 427 | 29014 |
Richard J. Roman | 84 | 461 | 23760 |
Diana W. Bianchi | 81 | 405 | 24554 |
Paolo Raggi | 80 | 439 | 33332 |
Helmut G. Rennke | 77 | 256 | 33959 |