The lysosomal disease caused by mutant VPS33A
Abstract A rare lysosomal disease resembling a mucopolysaccharidosis with unusual systemic features, including renal disease and platelet dysfunction, caused by the defect in a conserved region of the VPS33A gene on human chromosome 12q24.31, occurs in Yakuts—a nomadic Turkic ethnic group of Souther...
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Online Access: | http://dx.doi.org/10.1093/hmg/ddz077 http://academic.oup.com/hmg/article-pdf/28/15/2514/28936176/ddz077.pdf |
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croxfordunivpr:10.1093/hmg/ddz077 2024-09-09T20:13:40+00:00 The lysosomal disease caused by mutant VPS33A Pavlova, Elena V Shatunov, Aleksey Wartosch, Lena Moskvina, Alena I Nikolaeva, Lena E Bright, Nicholas A Tylee, Karen L Church, Heather J Ballabio, Andrea Luzio, J Paul Cox, Timothy M Wellcome Trust National Institute for Health Research Wellcome Trust Strategic Award Medical Research Council National Institute for Health Research Cambridge Biomedical Research Centre and Research 2019 http://dx.doi.org/10.1093/hmg/ddz077 http://academic.oup.com/hmg/article-pdf/28/15/2514/28936176/ddz077.pdf en eng Oxford University Press (OUP) http://creativecommons.org/licenses/by/4.0/ Human Molecular Genetics volume 28, issue 15, page 2514-2530 ISSN 0964-6906 1460-2083 journal-article 2019 croxfordunivpr https://doi.org/10.1093/hmg/ddz077 2024-08-27T04:14:56Z Abstract A rare lysosomal disease resembling a mucopolysaccharidosis with unusual systemic features, including renal disease and platelet dysfunction, caused by the defect in a conserved region of the VPS33A gene on human chromosome 12q24.31, occurs in Yakuts—a nomadic Turkic ethnic group of Southern Siberia. VPS33A is a core component of the class C core vacuole/endosome tethering (CORVET) and the homotypic fusion and protein sorting (HOPS) complexes, which have essential functions in the endocytic pathway. Here we show that cultured fibroblasts from patients with this disorder have morphological changes: vacuolation with disordered endosomal/lysosomal compartments and—common to sphingolipid diseases—abnormal endocytic trafficking of lactosylceramide. Urine glycosaminoglycan studies revealed a pathological excess of sialylated conjugates as well as dermatan and heparan sulphate. Lipidomic screening showed elevated β-D-galactosylsphingosine with unimpaired activity of cognate lysosomal hydrolases. The 3D crystal structure of human VPS33A predicts that replacement of arginine 498 by tryptophan will de-stabilize VPS33A folding. We observed that the missense mutation reduced the abundance of full-length VPS33A and other components of the HOPS and CORVET complexes. Treatment of HeLa cells stably expressing the mutant VPS33A with a proteasome inhibitor rescued the mutant protein from degradation. We propose that the disease is due to diminished intracellular abundance of intact VPS33A. Exposure of patient-derived fibroblasts to the clinically approved proteasome inhibitor, bortezomib, or inhibition of glucosylceramide synthesis with eliglustat, partially corrected the impaired lactosylceramide trafficking defect and immediately suggest therapeutic avenues to explore in this fatal orphan disease. Article in Journal/Newspaper Yakuts Siberia Oxford University Press Human Molecular Genetics 28 15 2514 2530 |
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Oxford University Press |
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croxfordunivpr |
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English |
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Abstract A rare lysosomal disease resembling a mucopolysaccharidosis with unusual systemic features, including renal disease and platelet dysfunction, caused by the defect in a conserved region of the VPS33A gene on human chromosome 12q24.31, occurs in Yakuts—a nomadic Turkic ethnic group of Southern Siberia. VPS33A is a core component of the class C core vacuole/endosome tethering (CORVET) and the homotypic fusion and protein sorting (HOPS) complexes, which have essential functions in the endocytic pathway. Here we show that cultured fibroblasts from patients with this disorder have morphological changes: vacuolation with disordered endosomal/lysosomal compartments and—common to sphingolipid diseases—abnormal endocytic trafficking of lactosylceramide. Urine glycosaminoglycan studies revealed a pathological excess of sialylated conjugates as well as dermatan and heparan sulphate. Lipidomic screening showed elevated β-D-galactosylsphingosine with unimpaired activity of cognate lysosomal hydrolases. The 3D crystal structure of human VPS33A predicts that replacement of arginine 498 by tryptophan will de-stabilize VPS33A folding. We observed that the missense mutation reduced the abundance of full-length VPS33A and other components of the HOPS and CORVET complexes. Treatment of HeLa cells stably expressing the mutant VPS33A with a proteasome inhibitor rescued the mutant protein from degradation. We propose that the disease is due to diminished intracellular abundance of intact VPS33A. Exposure of patient-derived fibroblasts to the clinically approved proteasome inhibitor, bortezomib, or inhibition of glucosylceramide synthesis with eliglustat, partially corrected the impaired lactosylceramide trafficking defect and immediately suggest therapeutic avenues to explore in this fatal orphan disease. |
author2 |
Wellcome Trust National Institute for Health Research Wellcome Trust Strategic Award Medical Research Council National Institute for Health Research Cambridge Biomedical Research Centre and Research |
format |
Article in Journal/Newspaper |
author |
Pavlova, Elena V Shatunov, Aleksey Wartosch, Lena Moskvina, Alena I Nikolaeva, Lena E Bright, Nicholas A Tylee, Karen L Church, Heather J Ballabio, Andrea Luzio, J Paul Cox, Timothy M |
spellingShingle |
Pavlova, Elena V Shatunov, Aleksey Wartosch, Lena Moskvina, Alena I Nikolaeva, Lena E Bright, Nicholas A Tylee, Karen L Church, Heather J Ballabio, Andrea Luzio, J Paul Cox, Timothy M The lysosomal disease caused by mutant VPS33A |
author_facet |
Pavlova, Elena V Shatunov, Aleksey Wartosch, Lena Moskvina, Alena I Nikolaeva, Lena E Bright, Nicholas A Tylee, Karen L Church, Heather J Ballabio, Andrea Luzio, J Paul Cox, Timothy M |
author_sort |
Pavlova, Elena V |
title |
The lysosomal disease caused by mutant VPS33A |
title_short |
The lysosomal disease caused by mutant VPS33A |
title_full |
The lysosomal disease caused by mutant VPS33A |
title_fullStr |
The lysosomal disease caused by mutant VPS33A |
title_full_unstemmed |
The lysosomal disease caused by mutant VPS33A |
title_sort |
lysosomal disease caused by mutant vps33a |
publisher |
Oxford University Press (OUP) |
publishDate |
2019 |
url |
http://dx.doi.org/10.1093/hmg/ddz077 http://academic.oup.com/hmg/article-pdf/28/15/2514/28936176/ddz077.pdf |
genre |
Yakuts Siberia |
genre_facet |
Yakuts Siberia |
op_source |
Human Molecular Genetics volume 28, issue 15, page 2514-2530 ISSN 0964-6906 1460-2083 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/hmg/ddz077 |
container_title |
Human Molecular Genetics |
container_volume |
28 |
container_issue |
15 |
container_start_page |
2514 |
op_container_end_page |
2530 |
_version_ |
1809815344441720832 |