2023
Hereditary Hypophosphatemic Rickets with Hypercalciuria Presenting with Enthesopathy, Renal Cysts, and High Serum c-Terminal FGF23: Single-Center Experience and Systematic Review
Dodamani M, Memon S, Karlekar M, Lila A, Khan M, Sarathi V, Arya S, Jamale T, Thakare S, Patil V, Shah N, Bergwitz C, Bandgar T. Hereditary Hypophosphatemic Rickets with Hypercalciuria Presenting with Enthesopathy, Renal Cysts, and High Serum c-Terminal FGF23: Single-Center Experience and Systematic Review. Calcified Tissue International 2023, 114: 137-146. PMID: 37981601, DOI: 10.1007/s00223-023-01156-2.Peer-Reviewed Original ResearchConceptsSingle-center experienceHereditary hypophosphatemic ricketsRenal calcificationSLC34A3 mutationsSystematic reviewHypophosphatemic ricketsLow bone mineral densityC-terminal FGF23Median age 38 yearsBone mineral densityIron deficiency anemiaPhenotype-genotype correlationAge 38 yearsDisorders of phosphate homeostasisRickets/osteomalaciaNon-truncating variantsLow BMDNormal BMDBone involvementDeficiency anemiaSingle-centerMineral densityCase seriesElevated FGF23Initial misdiagnosis
2020
Different elemental infant formulas show equivalent phosphorus and calcium bioavailability in healthy volunteers
Bergwitz C, Eussen SRBM, Janssens PLHR, Visser M, Carpenter TO, van Helvoort A. Different elemental infant formulas show equivalent phosphorus and calcium bioavailability in healthy volunteers. Nutrition Research 2020, 85: 71-83. PMID: 33450668, DOI: 10.1016/j.nutres.2020.11.004.Peer-Reviewed Original ResearchConceptsGeometric mean ratiosAcid-suppressive medicationsArea under the curveHealthy volunteersSerum phosphateCalcium bioavailabilityGastric acid-suppressive medicationsRetrospective chart reviewSerum calcium concentrationBioavailability of phosphorusCross-over studyInfant formulaElemental formula useSingle oral doseCalcium excretionDouble-blindGram of phosphorusSingle-centerChart reviewOral doseOvernight fastingSerum phosphorusBioequivalence criteriaWashout periodMean ratios
2014
Mutations in SLC34A3/NPT2c Are Associated with Kidney Stones and Nephrocalcinosis
Dasgupta D, Wee MJ, Reyes M, Li Y, Simm PJ, Sharma A, Schlingmann KP, Janner M, Biggin A, Lazier J, Gessner M, Chrysis D, Tuchman S, Baluarte HJ, Levine MA, Tiosano D, Insogna K, Hanley DA, Carpenter TO, Ichikawa S, Hoppe B, Konrad M, Sävendahl L, Munns CF, Lee H, Jüppner H, Bergwitz C. Mutations in SLC34A3/NPT2c Are Associated with Kidney Stones and Nephrocalcinosis. Journal Of The American Society Of Nephrology 2014, 25: 2366-2375. PMID: 24700880, PMCID: PMC4178443, DOI: 10.1681/asn.2013101085.Peer-Reviewed Original ResearchConceptsIdiopathic hypercalciuriaDecreased tubular reabsorption of phosphateIncreased risk of kidney stone formationSerum 1,25(OH)2 vitamin DTubular reabsorption of phosphateAssociated with kidney stonesVitamin D levelsSolute carrier family 34Renal phosphate wastingDecreased serum phosphateHereditary hypophosphatemic ricketsHealthy family membersReabsorption of phosphateRisk of kidney stone formationRickets/osteomalaciaDecreased tubular reabsorptionKidney stone formationSLC34A3 mutationsIndependent of genotypeMedullary nephrocalcinosisSerum phosphateVitamin DDependent phosphate cotransporterTubular reabsorptionD levels
2012
Dietary phosphate modifies lifespan in Drosophila
Bergwitz C. Dietary phosphate modifies lifespan in Drosophila. Nephrology Dialysis Transplantation 2012, 27: 3399-3406. PMID: 22942172, DOI: 10.1093/ndt/gfs362.Peer-Reviewed Reviews, Practice Guidelines, Standards, and Consensus StatementsConceptsImportant cellular processesNutrient-sensing pathwaysDrosophila melanogasterCellular processesLifespan extensionLarval developmentPhosphonoformic acidHuman disordersNormal fliesCellular uptakeSpecific pathwaysEffects of dietary phosphateDrosophilaReduced lifespanModel systemReduced cellular uptakeAdult lifespanLittle phosphateAbsorption of phosphatePathwayLifespanDietary phosphateTherapeutic approachesMelanogasterPowerful tool
2008
A Patient With Hypophosphatemia, a Femoral Fracture, and Recurrent Kidney Stones: Report of a Novel Mutation in SLC34A3
Page K, Bergwitz C, Jaureguiberry G, Harinarayan CV, Insogna K. A Patient With Hypophosphatemia, a Femoral Fracture, and Recurrent Kidney Stones: Report of a Novel Mutation in SLC34A3. Endocrine Practice 2008, 14: 869-874. PMID: 18996815, PMCID: PMC2773288, DOI: 10.4158/ep.14.7.869.Peer-Reviewed Original ResearchConceptsSLC34A3 geneClinical presentationNovel mutationsHistory of flank painMissense mutationsPatient's unusual clinical presentationUnusual clinical presentationPatient's clinical courseAtypical clinical presentationHereditary hypophosphatemic ricketsTreated with calcitriolRecurrent kidney stonesDisorder associated with mutationsGenomic DNA samplesStress fracturesSLC34A3 mutationsFlank painRecurrent nephrolithiasisInsufficiency fracturesClinical courseClinical improvementNaPi-IIcHypophosphatemic ricketsCompound heterozygotesGenetic analysisA novel missense mutation in SLC34A3 that causes hereditary hypophosphatemic rickets with hypercalciuria in humans identifies threonine 137 as an important determinant of sodium-phosphate cotransport in NaPi-IIc
Jaureguiberry G, Carpenter TO, Forman S, Jüppner H, Bergwitz C. A novel missense mutation in SLC34A3 that causes hereditary hypophosphatemic rickets with hypercalciuria in humans identifies threonine 137 as an important determinant of sodium-phosphate cotransport in NaPi-IIc. American Journal Of Physiology. Renal Physiology 2008, 295: f371-f379. PMID: 18480181, PMCID: PMC2519180, DOI: 10.1152/ajprenal.00090.2008.Peer-Reviewed Original ResearchMeSH KeywordsAdultAllelesAnimalsBase SequenceExocytosisFamilial Hypophosphatemic RicketsFemaleHaplotypesHumansHypercalciuriaKidneyMaleMolecular Sequence DataMutation, MissenseOocytesOpossumsPhosphatesPolymorphism, Single NucleotideSodiumSodium-Phosphate Cotransporter ProteinsSodium-Phosphate Cotransporter Proteins, Type IIcThreonineXenopus laevisConceptsEncoding enhanced green fluorescent proteinHereditary hypophosphatemic ricketsNaPi-IIcSodium-phosphate cotransporterLoss of expressionAmino acid residuesSodium-phosphate cotransportGreen fluorescence proteinImportant functional roleComplete lossOpossum kidneyHypophosphatemic ricketsXenopus laevis oocytesNovel missense mutationPaternal alleleWild-typeFunctional analysisFluorescence proteinNH2 terminusAcid residuesApical patchesCompound heterozygous mutationsExpression plasmidFunctional roleRecurrent kidney stones
2005
SLC34A3 Mutations in Patients with Hereditary Hypophosphatemic Rickets with Hypercalciuria Predict a Key Role for the Sodium-Phosphate Cotransporter NaPi-IIc in Maintaining Phosphate Homeostasis
Bergwitz C, Roslin NM, Tieder M, Loredo-Osti JC, Bastepe M, Abu-Zahra H, Frappier D, Burkett K, Carpenter TO, Anderson D, Garabédian M, Sermet I, Fujiwara TM, Morgan K, Tenenhouse HS, Jüppner H. SLC34A3 Mutations in Patients with Hereditary Hypophosphatemic Rickets with Hypercalciuria Predict a Key Role for the Sodium-Phosphate Cotransporter NaPi-IIc in Maintaining Phosphate Homeostasis. American Journal Of Human Genetics 2005, 78: 179-192. PMID: 16358214, PMCID: PMC1380228, DOI: 10.1086/499409.Peer-Reviewed Original ResearchConceptsConsanguineous BedouinFirst membrane-spanning domainMembrane-spanning domainsPhosphate homeostasisRenal sodium-phosphate cotransporterNucleotide sequence analysisDihydroxyvitamin D levelsSingle nucleotide deletionHereditary hypophosphatemic ricketsCompound heterozygous missenseSLC34A3 mutationsHomozygous single nucleotide deletionHypophosphatemic ricketsLinkage scanCandidate genesGenomic DNASodium-phosphate cotransporterSequence analysisD levelsHomozygosity mappingDeletion mutationsGenomewide linkage scanKey roleChromosome 9q34Mutations
2001
Identification of novel CBFA1/RUNX2 mutations causing cleidocranial dysplasia
Bergwitz C, Prochnau A, Mayr B, Kramer F, Rittierodt M, Berten H, Hausamen J, Brabant G. Identification of novel CBFA1/RUNX2 mutations causing cleidocranial dysplasia. Journal Of Inherited Metabolic Disease 2001, 24: 648-656. PMID: 11768584, DOI: 10.1023/a:1012758925617.Peer-Reviewed Original ResearchConceptsCleidocranial dysplasiaPatient's leukocyte DNADelayed tooth eruptionBsmI restriction siteHealthy family membersRUNX2 mutationAberrant amino acidsClavicular dysplasiaPatent fontanelsCore-binding factor a1Haplotype insufficiencyTooth budsTooth eruptionShort statureBone densityLeukocyte DNAIncreased riskGrowth retardationRestriction sitesDistal phalanxNucleotide changesDysplasiaPremature stopFrameshift mutationHealthy membersFamilial isolated parathyroid adenoma in a consanguineous family
Bergwitz C, Bremer B, Soudah B, Mayr B, Brabant G. Familial isolated parathyroid adenoma in a consanguineous family. Journal Of Endocrinological Investigation 2001, 24: 349-355. PMID: 11407655, DOI: 10.1007/bf03343872.Peer-Reviewed Original ResearchConceptsPrimary hyperparathyroidismSecond-degree relativesParathyroid adenomaMultiple endocrine neoplasia 1Recessive mode of inheritanceLeft lower neckRecurrent parathyroid adenomaGood healthGenetic testingSigns or symptomsGerm-cell mutationsBilateral hearing lossPre-term childrenSternocleidomastoid muscleSymptomatic hypercalcemiaMode of inheritanceOncocytic differentiationParathyroid massGentamicin treatmentGerm cell mutationsUltrasound scanRare formLower neckSubsequent autotransplantationEndocrine studies
1995
Pseudohypoparathyroidism type Ib is not caused by mutations in the coding exons of the human parathyroid hormone (PTH)/PTH-related peptide receptor gene
Schipani E, Weinstein LS, Bergwitz C, Iida-Klein A, Kong XF, Stuhrmann M, Kruse K, Whyte MP, Murray T, Schmidtke J. Pseudohypoparathyroidism type Ib is not caused by mutations in the coding exons of the human parathyroid hormone (PTH)/PTH-related peptide receptor gene. The Journal Of Clinical Endocrinology & Metabolism 1995, 80: 1611-1621. PMID: 7745008, DOI: 10.1210/jcem.80.5.7745008.Peer-Reviewed Original ResearchConceptsPseudohypoparathyroidism type IbPHP-IbCoding exonsExon GNucleotide sequenceBase changesHuman genomic DNA clonesExon E2Receptor geneTemperature gradient gel electrophoresisGenomic DNA clonesRestriction enzyme mappingReceptor cytoplasmic tailPHP-Ib patientsPTH/PTH-related peptideReverse transcriptase-polymerase chain reactionSplice donor sitePTH/PTHrP receptor geneTranscriptase-polymerase chain reactionGradient gel electrophoresisType IbChain reactionDirect nucleotide sequencingWild-type receptorNorthern blot analysis