2019
Aberrant splicing contributes to severe α-spectrin-linked congenital hemolytic anemia
Gallagher PG, Maksimova Y, Lezon-Geyda K, Newburger PE, Medeiros D, Hanson RD, Rothman J, Israels S, Wall DA, Sidonio RF, Sieff C, Gowans LK, Mittal N, Rivera-Santiago R, Speicher DW, Baserga SJ, Schulz VP. Aberrant splicing contributes to severe α-spectrin-linked congenital hemolytic anemia. Journal Of Clinical Investigation 2019, 129: 2878-2887. PMID: 31038472, PMCID: PMC6597203, DOI: 10.1172/jci127195.Peer-Reviewed Original ResearchConceptsRecessive hereditary spherocytosisSplice acceptor siteHuman genetic diseasesMRNA stability studiesAberrant splicing contributesSplicing contributesWhole-genome sequencingSplicing analysisHereditary pyropoikilocytosisTermination codonNull allelesGenome sequencingWhole-exome sequencingBranch pointsNumerous mutationsGenetic diseasesLinkage disequilibriumMRNA transcriptsΑ-spectrinMinigene studiesAcceptor sitesMutationsExome sequencingNew targets
2018
Altered Splicing from a Mutated Alternate Branch Point Is Common in Severe Alpha-Spectrin Linked Inherited Anemia
Lezon-Geyda K, Schulz V, Maksimova Y, Gallagher P. Altered Splicing from a Mutated Alternate Branch Point Is Common in Severe Alpha-Spectrin Linked Inherited Anemia. Blood 2018, 132: 503. DOI: 10.1182/blood-2018-99-117752.Peer-Reviewed Original ResearchMRNA transcriptsTermination codonK562 cellsMinigene assayIntron 30Precise genetic basisAcceptor sitesInsertion/deletion mutationsHereditary pyropoikilocytosisWhole-genome sequencingNMD inhibitorsAcceptor splice siteDiagnostic gene panelsGenome databaseMRNA splicingWild-type minigeneConsensus sitesAltered splicingExon 31Genetic basisTranscript productionErythroid cellsGene manipulationGenetic analysisWT background
2013
The common hereditary elliptocytosis-associated α-spectrin L260P mutation perturbs erythrocyte membranes by stabilizing spectrin in the closed dimer conformation
Harper SL, Sriswasdi S, Tang HY, Gaetani M, Gallagher PG, Speicher DW. The common hereditary elliptocytosis-associated α-spectrin L260P mutation perturbs erythrocyte membranes by stabilizing spectrin in the closed dimer conformation. Blood 2013, 122: 3045-3053. PMID: 23974198, PMCID: PMC3811177, DOI: 10.1182/blood-2013-02-487702.Peer-Reviewed Original ResearchMeSH KeywordsAmino Acid SequenceBinding SitesCross-Linking ReagentsElliptocytosis, HereditaryErythrocyte MembraneHumansModels, MolecularMolecular Sequence DataMutationProtein BindingProtein MultimerizationProtein StabilityProtein Structure, SecondaryProtein Structure, TertiaryRecombinant ProteinsSpectrinConceptsHereditary elliptocytosisMembrane destabilizationLarge conformational rearrangementsGel filtration analysisMembrane proteinsTetramer assemblyHereditary pyropoikilocytosisBiophysical analysisCommon hereditary elliptocytosisConformational rearrangementsDimer conformationHelical contentTetramerization siteFiltration analysisSpectrin tetramersNovel mechanismUnknown mechanismMutationsBinding assaysSpectrinChemical crosslinkingErythrocyte shapeTetramerErythrocyte membranesMembrane
2007
Identification and Characterization of α-Spectrin Mutations Associated with Inherited Hemolytic Anemia.
Tolpinrud W, Gaetani M, Maksimova Y, Mootien S, Harper S, Forget B, Speicher D, Gallagher P. Identification and Characterization of α-Spectrin Mutations Associated with Inherited Hemolytic Anemia. Blood 2007, 110: 1706. DOI: 10.1182/blood.v110.11.1706.1706.Peer-Reviewed Original ResearchWild typeMissense mutationsSelf-association siteMembrane skeletonΑ-spectrinHereditary elliptocytosisProline substitutionSpectrin peptidesHereditary pyropoikilocytosisCommon protein polymorphismHPLC gel filtrationHuman disease pathogenesisCharacterization of variantsErythrocyte membrane skeletonMajor structural componentTriple-helical configurationMembrane biologyDifferent missense mutationsSpectrin geneA Case of HPP with a Novel Combination of α and β Spectrin Mutations.
Natarajan K, Kutlar F, Li T, Gallagher P, Kutlar A. A Case of HPP with a Novel Combination of α and β Spectrin Mutations. Blood 2007, 110: 1736. DOI: 10.1182/blood.v110.11.1736.1736.Peer-Reviewed Original ResearchAfrican American femalesNon-immune hemolytic anemiaOld diagnosisHistory of splenectomySickle Cell CenterYear old black femaleAmerican femalesHereditary pyropoikilocytosisPathologic examRBC fragmentationEarly satietyPeripheral bloodClinical syndromeRed cell morphologyMonths durationHemolytic anemiaClinical examSevere formLifelong historyAutosomal recessive mannerRed pulpPatientsBlood disordersMembrane cytoskeleton proteinsAge 15
2005
A novel splicing mutation of the α-spectrin gene in the original hereditary pyropoikilocytosis kindred
Costa DB, Lozovatsky L, Gallagher PG, Forget BG. A novel splicing mutation of the α-spectrin gene in the original hereditary pyropoikilocytosis kindred. Blood 2005, 106: 4367-4369. PMID: 16150946, PMCID: PMC1895230, DOI: 10.1182/blood-2005-05-1813.Peer-Reviewed Original ResearchConceptsFrame premature termination codonsRed blood cell membrane skeletonCell membrane skeletonΑ-spectrin geneHereditary pyropoikilocytosisPremature termination codonConsensus splice sitesTissue culture cellsNovel splicing mutationMembrane skeletonIntronic fragmentTermination codonGene transcriptsAlpha-spectrinAbnormal splicingSplice siteStructural variantsGene transferMolecular defectsSplicing mutationCulture cellsAllelesExon 22TranscriptsMutations
2004
A Position +5 Intronic Mutation in the α-Spectrin Gene Is Associated with Marked Deficiency of α-Spectrin Production in the First Reported Cases of Hereditary Pyropoikilocytosis.
Costa D, Gallagher P, Forget B. A Position +5 Intronic Mutation in the α-Spectrin Gene Is Associated with Marked Deficiency of α-Spectrin Production in the First Reported Cases of Hereditary Pyropoikilocytosis. Blood 2004, 104: 576. DOI: 10.1182/blood.v104.11.576.576.Peer-Reviewed Original ResearchUpdate on the clinical spectrum and genetics of red blood cell membrane disorders.
Gallagher PG. Update on the clinical spectrum and genetics of red blood cell membrane disorders. Current Hematology Reports 2004, 3: 85-91. PMID: 14965483.Peer-Reviewed Original ResearchConceptsStructure/function relationshipsSignificant genetic heterogeneityPrecise genetic defectGenetic lociMolecular biologyRed blood cell membrane disordersSplicing mutationGene deletionNonsense mutationCell membraneFunction relationshipsGenetic heterogeneityGenetic defectsHereditary elliptocytosisMembrane disordersRed blood cell membraneBlood cell membranesHereditary pyropoikilocytosisMutationsBetter understandingErythrocyte membranesMembraneLociGeneticsBiology
1997
Genetic basis of the polymorphisms of the αI domain of spectrin
Gallagher P, Romana M, Wong C, Forget B. Genetic basis of the polymorphisms of the αI domain of spectrin. American Journal Of Hematology 1997, 56: 107-111. PMID: 9326352, DOI: 10.1002/(sici)1096-8652(199710)56:2<107::aid-ajh6>3.0.co;2-2.Peer-Reviewed Original ResearchConceptsGenetic basisHereditary elliptocytosisHereditary pyropoikilocytosisDistinct haplotypesGenetic analysisProtein phenotypeAlpha-spectrinChromosomal backgroundΑI domainSpectrinPolymorphismMutationsHaplotypesPhenotypeElliptocytosisPyropoikilocytosisPCRAssaysFamilyGene polymorphismsDomainIdentification
1996
Molecular basis and haplotyping of the alphaII domain polymorphisms of spectrin: application to the study of hereditary elliptocytosis and pyropoikilocytosis.
Gallagher PG, Kotula L, Wang Y, Marchesi SL, Curtis PJ, Speicher DW, Forget BG. Molecular basis and haplotyping of the alphaII domain polymorphisms of spectrin: application to the study of hereditary elliptocytosis and pyropoikilocytosis. American Journal Of Human Genetics 1996, 59: 351-9. PMID: 8755921, PMCID: PMC1914747.Peer-Reviewed Original ResearchMeSH KeywordsAmino Acid SequenceAnemia, Hemolytic, CongenitalAsianAsian PeopleBase SequenceBiological EvolutionBlack PeopleElliptocytosis, HereditaryErythrocytes, AbnormalHaplotypesHumansModels, GeneticMolecular Sequence DataMutagenesis, InsertionalPolymorphism, GeneticPrevalenceRepetitive Sequences, Nucleic AcidSpectrinUnited StatesWhite PeopleConceptsAlpha-spectrin geneAmino acid sequenceAcid sequenceHereditary elliptocytosisAlpha-spectrin chainHereditary pyropoikilocytosisPrincipal structural proteinErythrocyte membrane skeletonSingle nucleotide substitutionEvolutionary originLimited tryptic digestionMembrane skeletonMolecular basisGenomic DNANucleotide substitutionsStructural proteinsAlpha-spectrinDifferent haplotypesFounder effectGenesLinkage disequilibriumOnly haplotypeSpectrin proteinsCommon haplotypeTryptic digestion
1992
A common type of the spectrin alpha I 46-50a-kD peptide abnormality in hereditary elliptocytosis and pyropoikilocytosis is associated with a mutation distant from the proteolytic cleavage site. Evidence for the functional importance of the triple helical model of spectrin.
Gallagher PG, Tse WT, Coetzer T, Lecomte MC, Garbarz M, Zarkowsky HS, Baruchel A, Ballas SK, Dhermy D, Palek J. A common type of the spectrin alpha I 46-50a-kD peptide abnormality in hereditary elliptocytosis and pyropoikilocytosis is associated with a mutation distant from the proteolytic cleavage site. Evidence for the functional importance of the triple helical model of spectrin. Journal Of Clinical Investigation 1992, 89: 892-898. PMID: 1541680, PMCID: PMC442935, DOI: 10.1172/jci115669.Peer-Reviewed Original ResearchConceptsProteolytic cleavage sitesAlpha-spectrin chainTriple helical modelCleavage siteHelix 2Helix-breaking proline substitutionsHereditary elliptocytosisAlpha iAlpha-spectrin geneAlpha-helical structureAmino-terminal sideHereditary pyropoikilocytosisHelical modelErythrocyte membrane proteinsLimited tryptic digestionMembrane proteinsSpectrin repeatsDNA sequencesSpectrin chainsHelix 3Position 207Leucine residuesFunctional importanceProline substitutionPoint mutations