0000000000338230

AUTHOR

Alberto Lleó

showing 3 related works from this author

Characterization of the repeat expansion size in C9orf72 in amyotrophic lateral sclerosis and frontotemporal dementia

2013

Hexanucleotide repeat expansions within the C9orf72 gene are the most important genetic cause of amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD). The difficulty of developing a precise method to determine the expansion size has hampered the study of possible correlations between the hexanucleotide repeat number and clinical phenotype. Here we characterize, through a new non-radioactive Southern blot protocol, the expansion size range in a series of 38 ALS and 22 FTD heterozygous carriers of >30 copies of the repeat. Maximum, median and modal hexanucleotide repeat number were higher in ALS patients than in FTD patients (P < 0.05 in all comparisons). A higher median numb…

MaleHeterozygoteBiologyC9orf72GeneticsmedicineHumansAmyotrophic lateral sclerosisMolecular BiologyGenetics (clinical)GeneticsDNA Repeat ExpansionC9orf72 ProteinAmyotrophic Lateral SclerosisProteinsHeterozygote advantageTwins MonozygoticGeneral MedicineMiddle AgedDNA Repeat Expansionmedicine.diseaseC9orf72 ProteinBlotting SouthernFrontotemporal DementiaMutationFemaleAge of onsetTrinucleotide repeat expansionFrontotemporal dementia
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Rare coding variants in PLCG2, ABI3, and TREM2 implicate microglial-mediated innate immunity in Alzheimer's disease

2017

International audience; We identified rare coding variants associated with Alzheimer's disease in a three-stage case-control study of 85,133 subjects. In stage 1, we genotyped 34,174 samples using a whole-exome microarray. In stage 2, we tested associated variants (P < 1 × 10-4) in 35,962 independent samples using de novo genotyping and imputed genotypes. In stage 3, we used an additional 14,997 samples to test the most significant stage 2 associations (P < 5 × 10-8) using imputed genotypes. We observed three new genome-wide significant nonsynonymous variants associated with Alzheimer's disease: a protective variant in PLCG2 (rs72824905: p.Pro522Arg, P = 5.38 × 10-10, odds ratio (OR) = 0.68…

0301 basic medicineLinkage disequilibrium[SDV]Life Sciences [q-bio]MedizinSequence HomologyGenome-wide association studygenetics [Alzheimer Disease]metabolism [Microglia]Linkage Disequilibrium0302 clinical medicinegenetics [Protein Interaction Maps]genetics [Membrane Glycoproteins]Gene FrequencyImmunologicgenetics [Adaptor Proteins Signal Transducing]Receptorsgenetics [Exome]Odds RatioInnategenetics [Receptors Immunologic]ExomeProtein Interaction Mapsgenetics [Genetic Predisposition to Disease]Receptors ImmunologicABI3 protein humanGeneticsAdaptor Proteins Signal Transducing; Alzheimer Disease; Amino Acid Sequence; Case-Control Studies; Exome; Gene Expression Profiling; Gene Frequency; Genetic Predisposition to Disease; Genotype; Humans; Immunity Innate; Linkage Disequilibrium; Membrane Glycoproteins; Microglia; Odds Ratio; Phospholipase C gamma; Protein Interaction Maps; Receptors Immunologic; Sequence Homology Amino Acid; Polymorphism Single Nucleotide; GeneticsMembrane GlycoproteinsAdaptor ProteinsSingle NucleotideAdaptor Proteins Signal Transducing; Alzheimer Disease; Amino Acid Sequence; Case-Control Studies; Exome; Gene Expression Profiling; Gene Frequency; Genetic Predisposition to Disease; Genotype; Humans; Immunity Innate; Linkage Disequilibrium; Membrane Glycoproteins; Microglia; Odds Ratio; Phospholipase C gamma; Protein Interaction Maps; Receptors Immunologic; Sequence Homology Amino Acid; Polymorphism Single Nucleotide3. Good health[SDV] Life Sciences [q-bio]Amino AcidSettore MED/26 - NEUROLOGIAgenetics [Phospholipase C gamma][SDV.NEU]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]MicrogliaAlzheimer's diseaseCommon disease-common variantGenotypeBiologyPolymorphism Single NucleotideArticle03 medical and health sciencesAlzheimer Diseaseddc:570medicineJournal ArticleGeneticsHumansGenetic Predisposition to Disease[SDV.NEU] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]Amino Acid SequencePolymorphismAllele frequencyAdaptor Proteins Signal TransducingTREM2 protein humanSequence Homology Amino AcidTREM2Phospholipase C gammaGene Expression ProfilingCase-control studySignal TransducingImmunitymedicine.diseaseR1Immunity InnateMinor allele frequencygenetics [Immunity Innate]030104 developmental biologyCase-Control StudiesHuman medicine030217 neurology & neurosurgery
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Low Density Lipoprotein Receptor-related Protein (LRP) Interacts with Presenilin 1 and Is a Competitive Substrate of the Amyloid Precursor Protein (A…

2005

Presenilin 1 (PS1) is a critical component of the gamma-secretase complex, which is involved in the cleavage of several substrates including the amyloid precursor protein (APP) and the Notch receptor. Recently, the low density receptor-related protein (LRP) has been shown to be cleaved by a gamma-secretase-like activity. We postulated that LRP may interact with PS1 and tested its role as a competitive substrate for gamma-secretase. In this report we show that LRP colocalizes and interacts with endogenous PS1 using coimmunoprecipitation and fluorescence lifetime imaging microscopy. In addition, we found that gamma-secretase active site inhibitors do not disrupt the interaction between LRP an…

ImmunoprecipitationNotch signaling pathwayMice TransgenicBinding CompetitiveBiochemistryPresenilinCell LineSubstrate SpecificityRats Sprague-DawleyAmyloid beta-Protein PrecursorMiceEndopeptidasesmental disordersPresenilin-1Amyloid precursor proteinAnimalsAspartic Acid EndopeptidasesHumansBinding siteMolecular BiologyBrain ChemistryBinding SitesbiologyChemistryMembrane ProteinsCell BiologyRatsnervous system diseasesCell biologyTransmembrane domainBiochemistryMultiprotein ComplexesLDL receptorbiology.proteinlipids (amino acids peptides and proteins)Amyloid Precursor Protein SecretasesAmyloid precursor protein secretaseLow Density Lipoprotein Receptor-Related Protein-1Journal of Biological Chemistry
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