GroupPresentingHPOs: HP:0005952, HP:0030197
HPOsFreeText: LOPD confirmed by enzyme analysis in leukocytes or fibroblasts and mutation analysis, median GAA activity in leukocytes = 1.0 nmol glucose/mg hour, median GAA activity in fibroblasts = 12.9 nmol 4MU/mg hour, median MRC sum score = 80.8, 7 patients had total wheelchair dependence, 17 patients had partial wheelchair dependence, median upright FVC = 71.9%, median supine FVC = 54.0%, 4 patients required invasive ventilation, 18 required NIV, 13 patients experienced infusion associated reactions
GroupNotHPOs:
NotHPOsFreeText: no ERT treatments prior to study, no pregnant patients
NumberMales: 37
NumberFemales: 36
CountryOrigin: n/a
Ethnicity: n/a
Race: n/a
AgeRange: at symtom onset = 1.4-62.6yrs, at diagnosis = 1.4-72.7yrs, at ERT start = 26.2-74.0yrs
TotalNumber: 73
FamilyInfo: n/a
NoFamily: n/a
GroupAddInfo: all patients received ERT of 20mg/kg/2wk alglucosidase alfa intravenoulsy, minimum 5 months of treatment. Median duration of disease = 8.2yrs
GroupPreviousTesting: anti-rhGAA antibody titers determined in plasma or serum using ELISA, neutralizing effects of antibodies determined by addition of alglucosidase alfa and patient serum to medium of GAA-deficient fibroblasts then by measurement of GAA activity in cells and medium, manual muscle testing to assess skeletal muscle strength, FVC in upright and supine positions, 46 patients developed anti-rhGAA titers about background of 1:250 (16 high, 29 intermediate, 28 low to no)
GroupGenotypingMethod: mutation analysis (PMID: 18425781)
Variant1: NM_000152.4(GAA):c.-32-13T>G this was carried by all but 1 patient
Clinvar: 4027, https://www.ncbi.nlm.nih.gov/clinvar/variation/4027/
gnomAD: 0.003582, http://exac.broadinstitute.org/variant/17-78078341-T-G
The following are the four most common variants on the second allele
Variant2: NM_000152.4(GAA):c.525delT (p.Glu176Argfs)
ClinVar: 4033, https://www.ncbi.nlm.nih.gov/clinvar/variation/4033/
gnomAD: 7.041e-05, http://exac.broadinstitute.org/variant/17-78078909-CT-C
Variant3: NC_000017.11:g.(?80118193)(80118357_?)del
ClinVar: 456368, https://www.ncbi.nlm.nih.gov/clinvar/variation/456368/
gnomAD: n/a
Variant4: NM_000152.4(GAA):c.1548G>A (p.Trp516Ter)
ClinVar: 189025, https://www.ncbi.nlm.nih.gov/clinvar/variation/189025/
gnomAD: n/a
Variant5: NM_000152.4(GAA):c.925G>A (p.Gly309Arg)
ClinVar: 188797, https://www.ncbi.nlm.nih.gov/clinvar/variation/188797/
gnomAD: 4.609e-05, http://exac.broadinstitute.org/variant/17-78081665-G-A