Transcriptome analysis of intellectual disability patients with mutation in transcription factor genes
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA429023 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR6450120_1.fastq.gz | Fastqsanger.gz | |||
| SRR6450120_2.fastq.gz | Fastqsanger.gz | |||
| SRR6450121_1.fastq.gz | Fastqsanger.gz | |||
| SRR6450121_2.fastq.gz | Fastqsanger.gz | |||
| SRR6450122_1.fastq.gz | Fastqsanger.gz |
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Project description:Intellectual disability (ID) is a clinically important disease and a most prevalent neurodevelopmental disorder. The etiology and pathogenesis of ID are poorly recognized. Exome sequencing revealed a homozygous missense mutation in the POLR3B gene in a consanguineous family with three Intellectual disability with craniofacal anomalies patients. POLR3B gene encoding the second largest subunit of RNA polymerase III. To explore how genetic variants alter cell expression in ID patients, RNA sequencing on blood samples was performed and to obtain insights into the biological pathways influenced by POLR3B mutation, we applied our RNA-Seq data to several gene ontology programs such as ToppGene, Enrichr, KEGG. We detected a significant decrease expression of several spliceosomal RNAs, ribosomal proteins and transcription factors in our ID patients. We hypothesize that POLR3B mutation dysregulates the expression of some important transcription factors, ribosomal and spliceosomal genes and impairments in protein synthesis and splicing mediated in part by transcription factors such as FOXC2, GATA1, .. contribute to impaired neuronal function and concurrence of intellectual disability and craniofacial anomalies in our patients. Our study highlights the emerging role of spliceosome and ribosomal proteins in intellectual disability.
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Project description:Characterization of methylation changes related do KDM5C c.807delC (p.V271X) Mutations in KDM5C (lysine (K)-specific demethylase 5C) were associated to up to 3% of the X-linked ID cases. Males carrying KDM5C mutations present reduced activity of the KDM5C protein, increasing H3K4 tri-methylation, which ultimately leads to up-regulation of KDM5C target genes. Whole-exome sequencingi n one of three brothers with intellectual disability followed by confirmation by Sanger sequencing in the family identified a frameshift mutation in the KDM5C exon 7 that devoid of the JmjC catalytic domain from the protein. Two other brothers also presenting intellectual disability as well as in their clinically normal mother, who had completely skewed X-inactivation also had the mutation. An empirical Bayesian analysis of methylation levels between cases and controls identified 399 differentially methylated positions, 288 hypomethylated and 111 hypermethylated.Among the genes associated with the hypomethylated CpGs were FBXL5 and CACYBP, both involved in the ubiquitination pathway.
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Project description:Human disease mutation discovery has so far been biased towards protein coding regions. Having excluded all annotated coding regions, we performed targeted massively parallel re-sequencing of the non-repetitive genomic linkage interval of the MRX3 family at Xq28. We identified a regulatory mutation in the YY1 transcription factor binding site, which leads to overexpression of the chromatin-associated transcriptional regulator, HCFC1. When tested on embryonic murine neural stem cells (NSCs) and embryonic hippocampal neurons, HCFC1 overexpression led to a significant increase of the production of astrocytes and considerable reduction in neurite growth. Two other non-synonymous, potentially deleterious changes have been identified by X-exome sequencing in individuals with intellectual disability, implicating HCFC1 in normal brain function. Total RNA was extracted from LCL derived from four unrelated male controls, five unrelated female controls and two affected male cousins from the MRX3 family.
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Project description:Human disease mutation discovery has so far been biased towards protein coding regions. Having excluded all annotated coding regions, we performed targeted massively parallel re-sequencing of the non-repetitive genomic linkage interval of the MRX3 family at Xq28. We identified a regulatory mutation in the YY1 transcription factor binding site, which leads to overexpression of the chromatin-associated transcriptional regulator, HCFC1. When tested on embryonic murine neural stem cells (NSCs) and embryonic hippocampal neurons, HCFC1 overexpression led to a significant increase of the production of astrocytes and considerable reduction in neurite growth. Two other non-synonymous, potentially deleterious changes have been identified by X-exome sequencing in individuals with intellectual disability, implicating HCFC1 in normal brain function.
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