0000000000034677

AUTHOR

Katherine L. Helbig

0000-0001-8249-0549

showing 5 related works from this author

Autosomal recessive mutations inTHOC6cause intellectual disability: syndrome delineation requiring forward and reverse phenotyping

2016

THOC6 is a part of the THO complex, which is involved in coordinating mRNA processing with export. The THO complex interacts with additional components to form the larger TREX complex (transcription export complex). Previously, a homozygous missense mutation in THOC6 in the Hutterite population was reported in association with syndromic intellectual disability. Using exome sequencing, we identified three unrelated patients with bi-allelic mutations in THOC6 associated with intellectual disability and additional clinical features. Two of the patients were compound heterozygous for a stop and a missense mutation, and the third was homozygous for a missense mutation; the missense mutations wer…

0301 basic medicineGeneticseducation.field_of_studyMicrocephalybusiness.industryPopulationTranscription export complex030105 genetics & heredityCompound heterozygositymedicine.disease03 medical and health sciences030104 developmental biologyIntellectual disabilityGeneticsMedicineMissense mutationbusinesseducationExomeGenetics (clinical)Exome sequencingClinical Genetics
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IQSEC2-related encephalopathy in males and females: a comparative study including 37 novel patients.

2019

Variants in IQSEC2, escaping X inactivation, cause X-linked intellectual disability with frequent epilepsy in males and females. We aimed to investigate sex-specific differences.

0301 basic medicineMaleGénétique clinique[SDV]Life Sciences [q-bio]MedizinPhysiology030105 genetics & hereditySeizures/epidemiologyEpilepsyBrain Diseases/epidemiologyX-linked inheritanceIntellectual disabilityGuanine Nucleotide Exchange FactorsProtein IsoformsMissense mutationGenetics(clinical)10. No inequalityNon-U.S. Gov'tGenetics (clinical)X-linked recessive inheritanceComputingMilieux_MISCELLANEOUSBrain DiseasesSex CharacteristicsResearch Support Non-U.S. Gov'tBrainSciences bio-médicales et agricoles3. Good healthPedigreePhenotypeintellectual disabilityFemaleBrain/growth & developmentSex characteristicsGénétique moléculaireGuanine Nucleotide Exchange Factors/geneticsEncephalopathyResearch SupportX-inactivationArticle03 medical and health sciencesSeizuresProtein Isoforms/geneticsmedicineJournal ArticleIQSEC2HumansIntellectual Disability/epidemiology[SDV.GEN]Life Sciences [q-bio]/Geneticsbusiness.industryInfant NewbornisoformsCorrectionInfantmedicine.diseaseNewbornHuman genetics030104 developmental biologyMutationepilepsyHuman medicinebusiness[SDV.MHEP]Life Sciences [q-bio]/Human health and pathology
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Correction: IQSEC2-related encephalopathy in males and females:a comparative study including 37 novel patients

2019

This Article was originally published under Nature Research’s License to Publish, but has now been made available under a CC BY 4.0 license. The PDF and HTML versions of the Article have been modified accordingly.

Pediatricsmedicine.medical_specialtyText miningbusiness.industryPublished ErratumEncephalopathyMedizinMEDLINEMedicinebusinessmedicine.diseaseGenetics (clinical)
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PURA- Related Developmental and Epileptic Encephalopathy: Phenotypic and Genotypic Spectrum

2021

Background and ObjectivesPurine-rich element-binding protein A (PURA) gene encodes Pur-α, a conserved protein essential for normal postnatal brain development. Recently, a PURA syndrome characterized by intellectual disability, hypotonia, epilepsy, and dysmorphic features was suggested. The aim of this study was to define and expand the phenotypic spectrum of PURA syndrome by collecting data, including EEG, from a large cohort of affected patients.MethodsData on unpublished and published cases were collected through the PURA Syndrome Foundation and the literature. Data on clinical, genetic, neuroimaging, and neurophysiologic features were obtained.ResultsA cohort of 142 patients was include…

Pediatricsmedicine.medical_specialtySocio-culturale[SDV.GEN] Life Sciences [q-bio]/GeneticsElectroencephalographyEpilepsyDevelopmental and Epileptic EncephalopathyIntellectual disabilitymedicineGenetics (clinical)feeding difficulties[SDV.GEN]Life Sciences [q-bio]/Geneticsmedicine.diagnostic_testbusiness.industryfungimedicine.diseaseHypotoniaEpileptic spasmsNeonatal hypotonianeonatal hypotoniaEpilepsy syndromesCohortepilepsyNeurology (clinical)medicine.symptombusiness
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HCN1 mutation spectrum: from neonatal epileptic encephalopathy to benign generalized epilepsy and beyond

2018

International audience; Hyperpolarization-activated cyclic nucleotide-gated (HCN) channels control neuronal excitability and their dysfunction has been linked to epileptogenesis but few individuals with neurological disorders related to variants altering HCN channels have been reported so far. In 2014, we described five individuals with epileptic encephalopathy due to de novo HCN1 variants. To delineate HCN1-related disorders and investigate genotype-phenotype correlations further, we assembled a cohort of 33 unpublished patients with novel pathogenic or likely pathogenic variants: 19 probands carrying 14 different de novo mutations and four families with dominantly inherited variants segre…

0301 basic medicineProbandMaleModels MolecularPotassium Channels[SDV]Life Sciences [q-bio]Medizinmedicine.disease_causeEpileptogenesisMembrane PotentialsEpilepsy0302 clinical medicineHyperpolarization-Activated Cyclic Nucleotide-Gated ChannelsMissense mutationChildGeneticsMutationMiddle AgedPhenotype3. Good healthTransmembrane domainclinical spectrum; epilepsy; HCN1; intellectual disability; ion channelintellectual disabilityChild PreschoolEpilepsy GeneralizedFemaleSpasms InfantileAdultAdolescentCHO CellsBiology03 medical and health sciencesYoung AdultCricetulusHCN1medicineAnimalsHumansGeneralized epilepsyGenetic Association StudiesAgedInfantmedicine.diseaseElectric Stimulationclinical spectrum030104 developmental biologyMutationion channelMutagenesis Site-DirectedepilepsyNeurology (clinical)030217 neurology & neurosurgery
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