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Two of these sphingolipidoses, Tay Sachs and Sandhoff diseases, are caused by \u03b2\u2010Hexosaminidase (HEXB) enzyme deficiency, resulting in ganglioside (GM2) accumulation and neuronal loss. The precise sequence of cellular events preceding, and leading to, neuropathology remains unclear, but likely involves inflammation and lysosomal accumulation of GM2 in multiple cell types. We aimed to determine the consequences of Hexb activity loss for different brain cell types using zebrafish. Hexb deficient zebrafish (<jats:italic>hexb<jats:sup>\u2212\/\u2212<\/jats:sup>)<\/jats:italic> showed lysosomal abnormalities already early in development both in radial glia, which are the neuronal and glial progenitors, and in microglia. Additionally, at 5 days postfertilization, <jats:italic>hexb<\/jats:italic><jats:sup>\u2212\/\u2212<\/jats:sup> zebrafish showed reduced locomotor activity. Although specific oligosaccharides accumulate in the adult brain, <jats:italic>hexb<jats:sup>\u2212\/\u2212<\/jats:sup>)<\/jats:italic> zebrafish are viable and apparently resistant to Hexb deficiency. In all, we identified cellular consequences of loss of Hexb enzyme activity during embryonic brain development, showing early effects on glia, which possibly underlie the behavioral aberrations. Hereby, we identified clues into the contribution of non\u2010neuronal lysosomal abnormalities in LSDs affecting the brain and provide a tool to further study what underlies the relative resistance to Hexb deficiency in vivo.<\/jats:p><\/jats:sec>","DOI":"10.1002\/glia.23641","type":"journal-article","created":{"date-parts":[[2019,5,29]],"date-time":"2019-05-29T12:21:21Z","timestamp":1559132481000},"page":"1705-1718","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":48,"title":["Hexb enzyme deficiency leads to lysosomal abnormalities in radial glia and microglia in zebrafish brain development"],"prefix":"10.1002","volume":"67","author":[{"given":"Laura E.","family":"Kuil","sequence":"first","affiliation":[{"name":"Department of Clinical Genetics, Erasmus MC University Medical Center Rotterdam  Rotterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"L\u00f3pez Mart\u00ed","sequence":"additional","affiliation":[{"name":"Department of Clinical Genetics, Erasmus MC University Medical Center Rotterdam  Rotterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ana","family":"Carreras Mascaro","sequence":"additional","affiliation":[{"name":"Department of Clinical Genetics, Erasmus MC University Medical Center Rotterdam  Rotterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeroen C.","family":"van den Bosch","sequence":"additional","affiliation":[{"name":"Department of Clinical Genetics, Erasmus MC University Medical Center Rotterdam  Rotterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul","family":"van den Berg","sequence":"additional","affiliation":[{"name":"Department of Clinical Genetics, Erasmus MC University Medical Center Rotterdam  Rotterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Herma C.","family":"van der Linde","sequence":"additional","affiliation":[{"name":"Department of Clinical Genetics, Erasmus MC University Medical Center Rotterdam  Rotterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kees","family":"Schoonderwoerd","sequence":"additional","affiliation":[{"name":"Department of Clinical Genetics, Erasmus MC University Medical Center Rotterdam  Rotterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"George J. 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