2022
Severe Phenotype in Patients with X-linked Hydrocephalus Caused by a Missense Mutation in L1CAM
Tuysuz B, Department of Pediatric Genetics I, Sencicek A, Ozer E, Goc N, Yalcinkaya C, Bilguvar K, Department of Neurosurgery P, Department of Neurology I. Severe Phenotype in Patients with X-linked Hydrocephalus Caused by a Missense Mutation in L1CAM. Turkish Archives Of Pediatrics 2022, 57: 521-525. PMID: 35950747, PMCID: PMC9524456, DOI: 10.5152/turkarchpediatr.2022.22070.Peer-Reviewed Original ResearchWhole-exome sequencingL1 syndromeSevere phenotypeMissense mutationsHemizygous missense mutationClinical characteristicsDifferential diagnosisIndex patientsPatientsCarrier mothersPathogenic missense mutationsMale childrenL1CAM mutationsPathogenic variantsMild formHydrocephalusSpeech delaySyndromeExon 18Truncating mutationsGenetic etiologyIntellectual disabilityL1CAML1CAM geneFamily membersBiallelic BICD2 variant is a novel candidate for Cohen-like syndrome
Caglayan AO, Tuysuz B, Gül E, Alkaya DU, Yalcinkaya C, Gleeson JG, Bilguvar K, Gunel M. Biallelic BICD2 variant is a novel candidate for Cohen-like syndrome. Journal Of Human Genetics 2022, 67: 553-556. PMID: 35338243, PMCID: PMC9420744, DOI: 10.1038/s10038-022-01032-1.Peer-Reviewed Original ResearchConceptsWhole-exome sequencing analysisTruncal obesityJoint hypermobilityLower extremitiesHomozygous missense mutationSevere formBICD2 mutationsType 2BHeterozygous mutationsSpeech delayType 2AIntellectual disabilityPatientsSyndromeConsanguineous unionsMissense mutationsNovel candidatesSequencing analysisFirst reportMutations
2021
Bi-allelic variants in SPATA5L1 lead to intellectual disability, spastic-dystonic cerebral palsy, epilepsy, and hearing loss
Richard EM, Bakhtiari S, Marsh APL, Kaiyrzhanov R, Wagner M, Shetty S, Pagnozzi A, Nordlie SM, Guida BS, Cornejo P, Magee H, Liu J, Norton BY, Webster RI, Worgan L, Hakonarson H, Li J, Guo Y, Jain M, Blesson A, Rodan LH, Abbott MA, Comi A, Cohen JS, Alhaddad B, Meitinger T, Lenz D, Ziegler A, Kotzaeridou U, Brunet T, Chassevent A, Smith-Hicks C, Ekstein J, Weiden T, Hahn A, Zharkinbekova N, Turnpenny P, Tucci A, Yelton M, Horvath R, Gungor S, Hiz S, Oktay Y, Lochmuller H, Zollino M, Morleo M, Marangi G, Nigro V, Torella A, Pinelli M, Amenta S, Husain RA, Grossmann B, Rapp M, Steen C, Marquardt I, Grimmel M, Grasshoff U, Korenke GC, Owczarek-Lipska M, Neidhardt J, Radio FC, Mancini C, Claps Sepulveda DJ, McWalter K, Begtrup A, Crunk A, Guillen Sacoto MJ, Person R, Schnur RE, Mancardi MM, Kreuder F, Striano P, Zara F, Chung WK, Marks WA, van Eyk CL, Webber DL, Corbett MA, Harper K, Berry JG, MacLennan AH, Gecz J, Tartaglia M, Salpietro V, Christodoulou J, Kaslin J, Padilla-Lopez S, Bilguvar K, Munchau A, Ahmed ZM, Hufnagel RB, Fahey MC, Maroofian R, Houlden H, Sticht H, Mane SM, Rad A, Vona B, Jin SC, Haack TB, Makowski C, Hirsch Y, Riazuddin S, Kruer MC. Bi-allelic variants in SPATA5L1 lead to intellectual disability, spastic-dystonic cerebral palsy, epilepsy, and hearing loss. American Journal Of Human Genetics 2021, 108: 2006-2016. PMID: 34626583, PMCID: PMC8546233, DOI: 10.1016/j.ajhg.2021.08.003.Peer-Reviewed Original ResearchConceptsSensorineural hearing lossCerebral palsyHearing lossBi-allelic variantsInner earRodent inner earDevelopmental delay/intellectual disabilityThin corpus callosumGlial cell nucleiIntellectual disabilityRat hippocampal neuronsWhite matter volumeNeurosensory hair cellsPeriventricular leukomalaciaQuantitative volumetryCerebral volumeCorpus callosumHippocampal neuronsMatter volumeReceptor functionBrain imagingHair cellsProminent expressionNeurodevelopmental phenotypesAffected individualsMutation in ZDHHC15 Leads to Hypotonic Cerebral Palsy, Autism, Epilepsy, and Intellectual Disability
Lewis SA, Bakhtiari S, Heim J, Cornejo P, Liu J, Huang A, Musmacker A, Jin SC, Bilguvar K, Padilla-Lopez SR, Kruer MC. Mutation in ZDHHC15 Leads to Hypotonic Cerebral Palsy, Autism, Epilepsy, and Intellectual Disability. Neurology Genetics 2021, 7: e602. PMID: 34345675, PMCID: PMC8323736, DOI: 10.1212/nxg.0000000000000602.Peer-Reviewed Original ResearchHypotonic cerebral palsyCerebral palsyIntellectual disabilityOvoid lesionsMotor dysfunctionRare causeCerebral volumeTall foreheadDental crowdingMuscle hypotoniaNeurodevelopmental disabilitiesArched palateAnimal modelsPalpebral fissuresMild brachycephalyFunction genotypeNeurodevelopmental disordersPatient variantsPalsyPatientsEpilepsyLocomotor defectsFunction mutationsCandidate variantsDisabilityRecessive COL4A2 Mutation Leads to Intellectual Disability, Epilepsy, and Spastic Cerebral Palsy
Bakhtiari S, Tafakhori A, Jin SC, Guida BS, Alehabib E, Firouzbadi S, Bilguvar K, Fahey MC, Darvish H, Kruer MC. Recessive COL4A2 Mutation Leads to Intellectual Disability, Epilepsy, and Spastic Cerebral Palsy. Neurology Genetics 2021, 7: e583. PMID: 33912663, PMCID: PMC8077768, DOI: 10.1212/nxg.0000000000000583.Peer-Reviewed Original ResearchCerebral palsySpastic cerebral palsyCortical visual impairmentBasement membrane thickeningStroke-related complicationsWhite matter diseaseIntellectual disabilityEarly fetal developmentCerebral calcificationsHemorrhagic strokeAutosomal dominant fashionMembrane thickeningPostnatal periodFunction effectsCOL4A2 mutationsFetal developmentClinical diagnosisVisual impairmentPalsyEpilepsyDiseaseDominant fashionGenes COL4A1Muscular systemDisabilityALG13 X‐linked intellectual disability: New variants, glycosylation analysis, and expanded phenotypes
Alsharhan H, He M, Edmondson AC, Daniel EJP, Chen J, Donald T, Bakhtiari S, Amor DJ, Jones EA, Vassallo G, Vincent M, Cogné B, Deb W, Werners AH, Jin SC, Bilguvar K, Christodoulou J, Webster RI, Yearwood KR, Ng BG, Freeze HH, Kruer MC, Li D, Raymond KM, Bhoj EJ, Sobering AK. ALG13 X‐linked intellectual disability: New variants, glycosylation analysis, and expanded phenotypes. Journal Of Inherited Metabolic Disease 2021, 44: 1001-1012. PMID: 33734437, PMCID: PMC8720508, DOI: 10.1002/jimd.12378.Peer-Reviewed Original ResearchConceptsTransferrin glycosylationProtein glycosylationPathogenic variantsN-glycansGlycosylation analysisGlycosylationVariable clinical phenotypeALG13Novel variantsPlasma glycansPhenotypeCongenital disorderIonization quadrupole timeVariantsUnderlying mechanismClinical phenotypeIntellectual disabilityNovo c.Unreported subjectsInfantile spasmsEpileptic encephalopathyClinical dataGlycansMale subjectsNeurodevelopmental course
2020
METAP1 mutation is a novel candidate for autosomal recessive intellectual disability
Caglayan AO, Aktar F, Bilguvar K, Baranoski JF, Akgumus GT, Harmanci AS, Erson-Omay EZ, Yasuno K, Caksen H, Gunel M. METAP1 mutation is a novel candidate for autosomal recessive intellectual disability. Journal Of Human Genetics 2020, 66: 215-218. PMID: 32764695, PMCID: PMC7785574, DOI: 10.1038/s10038-020-0820-0.Peer-Reviewed Original ResearchConceptsEssential proteinsAutosomal recessive intellectual disabilityRecessive intellectual disabilityMethionine aminopeptidase 1Genomic analysisHomozygous nonsense mutationFunction mutationsNovel homozygous nonsense mutationNonsense mutationAminopeptidase 1Novel candidatesNeuronal functionMutationsMolecular pathogenesisProteinIntellectual disabilityGenome testingEukaryotesNovel etiologyMetAP1GenesNeurologic impairmentCommon diseasePathwayCells
2014
NGLY1 mutation causes neuromotor impairment, intellectual disability, and neuropathy
Caglayan AO, Comu S, Baranoski JF, Parman Y, Kaymakçalan H, Akgumus GT, Caglar C, Dolen D, Erson-Omay EZ, Harmanci AS, Mishra-Gorur K, Freeze HH, Yasuno K, Bilguvar K, Gunel M. NGLY1 mutation causes neuromotor impairment, intellectual disability, and neuropathy. European Journal Of Medical Genetics 2014, 58: 39-43. PMID: 25220016, PMCID: PMC4804755, DOI: 10.1016/j.ejmg.2014.08.008.Peer-Reviewed Original ResearchConceptsN-glycanase 1Proteasome-mediated degradationConserved enzymeFrame-shift mutationApparent intellectual disabilityBase pair deletionNeuromotor impairmentNovel homozygous frame-shift mutationHomozygous frame-shift mutationNeuronal cellsPair deletionAmyotrophic lateral sclerosisIntellectual disabilityMutationsProteinNeurological functionCorneal opacityNeurologic diseaseLateral sclerosisParkinson's diseaseProgressive lossDiseaseCytoplasmImpairmentDeletionAutosomal recessive spastic tetraplegia caused by AP4M1 and AP4B1 gene mutation: Expansion of the facial and neuroimaging features
Tüysüz B, Bilguvar K, Koçer N, Yalçınkaya C, Çağlayan O, Gül E, Şahin S, Çomu S, Günel M. Autosomal recessive spastic tetraplegia caused by AP4M1 and AP4B1 gene mutation: Expansion of the facial and neuroimaging features. American Journal Of Medical Genetics Part A 2014, 164: 1677-1685. PMID: 24700674, DOI: 10.1002/ajmg.a.36514.Peer-Reviewed Original ResearchMeSH KeywordsAdolescentBasic Helix-Loop-Helix Leucine Zipper Transcription FactorsBrainChildDNA Mutational AnalysisDNA-Binding ProteinsFaciesFemaleGenes, RecessiveGenetic Association StudiesHomozygoteHumansMagnetic Resonance ImagingMaleMutationNeuroimagingPedigreePhenotypeQuadriplegiaRNA-Binding ProteinsSiblingsConceptsAdaptor protein complex 4Tetraplegic cerebral palsySevere intellectual disabilitySpastic tetraplegiaCerebral palsySpastic tetraplegic cerebral palsyIntellectual disabilityStereotypic laughterCranial imaging findingsWhite matter volumeWhole-exome sequencingNovel homozygous mutationAsymmetrical ventriculomegalyCranial MRIImaging findingsClinical findingsNeuroimaging featuresBrain abnormalitiesCommon findingCorpus callosumAutosomal recessive phenotypePairs of siblingsPatientsSimilar facial featuresMatter volume
2013
P35 – 1937 A new variant detected in GRIN2A by whole-exome sequencing in a patient with intellectual disability with intractable epilepsy
Per H, Caglayan A, Canpolat M, Bilguvar K, Gümüş H, Kumandas S. P35 – 1937 A new variant detected in GRIN2A by whole-exome sequencing in a patient with intellectual disability with intractable epilepsy. European Journal Of Paediatric Neurology 2013, 17: s63. DOI: 10.1016/s1090-3798(13)70214-9.Peer-Reviewed Original Research