{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,12]],"date-time":"2026-09-12T02:16:58Z","timestamp":1789179418793,"version":"build-2803163510"},"reference-count":12,"publisher":"Oxford University Press (OUP)","issue":"8","license":[{"start":{"date-parts":[[2017,8,1]],"date-time":"2017-08-01T00:00:00Z","timestamp":1501545600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"funder":[{"DOI":"10.13039\/100006986","name":"Legacy Heritage Fund","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100006986","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["R01 DK067859"],"award-info":[{"award-number":["R01 DK067859"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Legacy of Angels Foundation Grant"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2017,8,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:sec>\n                  <jats:title>BACKGROUND<\/jats:title>\n                  <jats:p>Deficiency of the lysosomal enzyme galactosylcerebrosidase (GALC) causes Krabbe disease. Newborn screening for Krabbe disease is ongoing, but improved methods for follow-up analysis of screen-positive babies are needed to better advise families and to optimize treatment. We report a new assay for the enzymatic activity of GALC in lymphocytes.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>METHODS<\/jats:title>\n                  <jats:p>T lymphocytes were isolated from venous blood by magnetic bead technology. The assay used a close structural analog of the natural substrate and LC-MS\/MS to quantify the amount of product with the aid of a chemically identical internal standard.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>RESULTS<\/jats:title>\n                  <jats:p>The analytical range of the assay (ratio of assay response for the QC high standard to that from all non\u2013enzymatic-dependent processes) was 20-fold greater than that for the conventional radiometric GALC assay. The LC-MS\/MS could distinguish cells that were null in GALC from those that contained traces of active enzyme (down to 0.3% of normal). There was a good correlation between the level of residual GALC activity in lymphocytes and the severity of Krabbe disease.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>CONCLUSIONS<\/jats:title>\n                  <jats:p>The new assay can measure small amounts of residual GALC activity in leukocytes with high accuracy compared to previous assays and can contribute, along with genotyping, biomarker analysis, and neurological imaging, a better plan for post\u2013newborn screening follow-up for Krabbe disease.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1373\/clinchem.2016.264952","type":"journal-article","created":{"date-parts":[[2017,6,7]],"date-time":"2017-06-07T20:55:27Z","timestamp":1496868927000},"page":"1363-1369","source":"Crossref","is-referenced-by-count":23,"title":["Lymphocyte Galactocerebrosidase Activity by LC-MS\/MS for Post\u2013Newborn Screening Evaluation of Krabbe Disease"],"prefix":"10.1093","volume":"63","author":[{"given":"Hsuan-Chieh","family":"Liao","sequence":"first","affiliation":[{"name":"Department of Chemistry, University of Washington, Seattle, WA"},{"name":"Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zdenek","family":"Spacil","sequence":"first","affiliation":[{"name":"Department of Chemistry, University of Washington, Seattle, WA"},{"name":"Current affiliation: Masaryk University, Research Center for Toxic Compounds in the Environment, Kamenice, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Farideh","family":"Ghomashchi","sequence":"first","affiliation":[{"name":"Department of Chemistry, University of Washington, Seattle, WA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria L","family":"Escolar","sequence":"first","affiliation":[{"name":"Children's Hospital of Pittsburgh, University of Pittsburgh Medical Center, Pittsburgh, PA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joanne","family":"Kurtzberg","sequence":"first","affiliation":[{"name":"Department of Pediatrics, Duke University, Durham, NC"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joseph J","family":"Orsini","sequence":"first","affiliation":[{"name":"Division of Genetics, Wadsworth Center, New York State Department of Health, Albany, NY"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Frantisek","family":"Turecek","sequence":"first","affiliation":[{"name":"Department of Chemistry, University of Washington, Seattle, WA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C Ronald","family":"Scott","sequence":"first","affiliation":[{"name":"Departments of Pediatrics and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael H","family":"Gelb","sequence":"first","affiliation":[{"name":"Department of Chemistry, University of 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