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De novo variants of CSNK2B cause a new intellectual disability-craniodigital syndrome by disrupting the canonical Wnt signaling pathway

ABSTRACT: Main purpose of the project is to investigate the consequences of de novo CSNK2B variant on transcriptome profiling of the patient compared to control. In this data, we seen differential expression of genes involved in the Wnt signaling pathway and transcription regulator.

ORGANISM(S): Homo sapiens

PROVIDER: GSE189065 | GEO | 2022/04/28

REPOSITORIES: GEO

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De novo variants of CSNK2B cause a new intellectual disability-craniodigital syndrome by disrupting the canonical Wnt signaling pathway

Project description:Main purpose of the project is to delineate the consequences of de novo variants identified in patients manifesting intellectual disability-craniodigital syndrome. To this end, we investigated the effects of mutated CK2β by performing phosphor proteome profiling of patient derived LCLs along with the age and gender matched control.

2022-05-04 | PXD029983 | Pride

De novo variants of CSNK2B cause a new intellectual disability-craniodigital syndrome by disrupting the canonical Wnt signaling pathway

Project description:Main purpose of the project is to delineate the consequences of de novo variants identified in patients manifesting intellectual disability-craniodigital syndrome. By employing pulldown assay coupled with mass spectrometry, we investigated the novel binding partners of CK2β and tried to find the impaired interaction due to variant, CK2β:NP_001311.3;p.Asp32His. Furthermore, we also investigated the effects of mutated CK2β by performing phosphoproteome profiling of patient derived LCLs along with the age and gender matched control.

2022-05-04 | PXD029970 | Pride

<i>De novo</i> variants of <i>CSNK2B</i> cause a new intellectual disability-craniodigital syndrome by disrupting the canonical Wnt signaling pathway.

Project description:CSNK2B encodes for casein kinase II subunit beta (CK2β), the regulatory subunit of casein kinase II (CK2), which is known to mediate diverse cellular pathways. Variants in this gene have been recently identified as a cause of Poirier-Bienvenu neurodevelopmental syndrome (POBINDS), but functional evidence is sparse. Here, we report five unrelated individuals: two of them manifesting POBINDS, while three are identified to segregate a new intellectual disability-craniodigital syndrome (IDCS), distinct from POBINDS. The three IDCS individuals carried two different de novo missense variants affecting the same codon of CSNK2B. Both variants, NP_001311.3; p.Asp32His and NP_001311.3; p.Asp32Asn, lead to an upregulation of CSNK2B expression at transcript and protein level, along with global dysregulation of canonical Wnt signaling. We found impaired interaction of the two key players DVL3 and β-catenin with mutated CK2β. The variants compromise the kinase activity of CK2 as evident by a marked reduction of phosphorylated β-catenin and consequent absence of active β-catenin inside nuclei of the patient-derived lymphoblastoid cell lines (LCLs). In line with these findings, whole-transcriptome profiling of patient-derived LCLs harboring the NP_001311.3; p.Asp32His variant confirmed a marked difference in expression of genes involved in the Wnt signaling pathway. In addition, whole-phosphoproteome analysis of the LCLs of the same subject showed absence of phosphorylation for 313 putative CK2 substrates, enriched in the regulation of nuclear β-catenin and transcription of the target genes. Our findings suggest that discrete variants in CSNK2B cause dominant-negative perturbation of the canonical Wnt signaling pathway, leading to a new craniodigital syndrome distinguishable from POBINDS.

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De novo variants of CSNK2B cause a new intellectual disability-craniodigital syndrome by disrupting the canonical Wnt signaling pathway

Project description:De novo variants of CSNK2B cause a new intellectual disability-craniodigital syndrome by disrupting the canonical Wnt signaling pathway

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De Novo Variants in MAPK8IP3 Cause Intellectual Disability with Variable Brain Anomalies.

Project description:Using exome sequencing, we have identified de novo variants in MAPK8IP3 in 13 unrelated individuals presenting with an overlapping phenotype of mild to severe intellectual disability. The de novo variants comprise six missense variants, three of which are recurrent, and three truncating variants. Brain anomalies such as perisylvian polymicrogyria, cerebral or cerebellar atrophy, and hypoplasia of the corpus callosum were consistent among individuals harboring recurrent de novo missense variants. MAPK8IP3 has been shown to be involved in the retrograde axonal-transport machinery, but many of its specific functions are yet to be elucidated. Using the CRISPR-Cas9 system to target six conserved amino acid positions in Caenorhabditis elegans, we found that two of the six investigated human alterations led to a significantly elevated density of axonal lysosomes, and five variants were associated with adverse locomotion. Reverse-engineering normalized the observed adverse effects back to wild-type levels. Combining genetic, phenotypic, and functional findings, as well as the significant enrichment of de novo variants in MAPK8IP3 within our total cohort of 27,232 individuals who underwent exome sequencing, we implicate de novo variants in MAPK8IP3 as a cause of a neurodevelopmental disorder with intellectual disability and variable brain anomalies.

| S-EPMC6369540 | biostudies-literature

De novo truncating variants in PHF21A cause intellectual disability and craniofacial anomalies.

Project description:Potocki-Shaffer syndrome (PSS) is a contiguous gene syndrome caused by 11p11.2 deletions. PSS is clinically characterized by intellectual disability, craniofacial anomalies, enlarged parietal foramina, and multiple exostoses. PSS occasionally shows autism spectrum disorder, epilepsy, and overgrowth. Some of the clinical features are thought to be associated with haploinsufficiency of two genes in the 11p11.2 region; variants affecting the function of ALX4 cause enlarged parietal foramina and EXT2 lead to multiple exostoses. However, the remaining clinical features were still yet to be linked to specific genetic alterations. In this study, we identified de novo truncating variants in an 11p11.2 gene, PHF21A, in three cases with intellectual disability and craniofacial anomalies. Among these three cases, autism spectrum disorder was recognized in one case, epilepsy in one case, and overgrowth in two cases. This study shows that PHF21A haploinsufficiency results in intellectual disability and craniofacial anomalies and possibly contributes to susceptibility to autism spectrum disorder, epilepsy, and overgrowth, all of which are PSS features.

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De novo mutations in the genome organizer CTCF cause Intellectual Disability

Project description:This SuperSeries is composed of the SubSeries listed below. Refer to individual Series

2013-06-01 | E-GEOD-46833 | biostudies-arrayexpress

De novo mutations in the genome organizer CTCF cause Intellectual Disability

Project description:This SuperSeries is composed of the SubSeries listed below.

2013-06-01 | GSE46833 | GEO

De novo substitutions of TRPM3 cause intellectual disability and epilepsy.

Project description:The developmental and epileptic encephalopathies (DEE) are a heterogeneous group of chronic encephalopathies frequently associated with rare de novo nonsynonymous coding variants in neuronally expressed genes. Here, we describe eight probands with a DEE phenotype comprising intellectual disability, epilepsy, and hypotonia. Exome trio analysis showed de novo variants in TRPM3, encoding a brain-expressed transient receptor potential channel, in each. Seven probands were identically heterozygous for a recurrent substitution, p.(Val837Met), in TRPM3's S4-S5 linker region, a conserved domain proposed to undergo conformational change during gated channel opening. The eighth individual was heterozygous for a proline substitution, p.(Pro937Gln), at the boundary between TRPM3's flexible pore-forming loop and an adjacent alpha-helix. General-population truncating variants and microdeletions occur throughout TRPM3, suggesting a pathomechanism other than simple haploinsufficiency. We conclude that de novo variants in TRPM3 are a cause of intellectual disability and epilepsy.

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De Novo Truncating Variants in SON Cause Intellectual Disability, Congenital Malformations, and Failure to Thrive.

Project description:SON is a key component of the spliceosomal complex and a critical mediator of constitutive and alternative splicing. Additionally, SON has been shown to influence cell-cycle progression, genomic integrity, and maintenance of pluripotency in stem cell populations. The clear functional relevance of SON in coordinating essential cellular processes and its presence in diverse human tissues suggests that intact SON might be crucial for normal growth and development. However, the phenotypic effects of deleterious germline variants in SON have not been clearly defined. Herein, we describe seven unrelated individuals with de novo variants in SON and propose that deleterious variants in SON are associated with a severe multisystem disorder characterized by developmental delay, persistent feeding difficulties, and congenital malformations, including brain anomalies.

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