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Mutations in FAM50A suggest that Armfield XLID syndrome is a spliceosomopathy (human)

ABSTRACT: Intellectual disability (ID) is a heterogeneous clinical entity and includes an excess of males who harbor variants on the X-chromosome (XLID). We report rare FAM50A missense variants in the original Armfield XLID syndrome family localized in Xq28 and four additional unrelated males with overlapping features. Our fam50a knockout (KO) zebrafish model exhibits abnormal neurogenesis and craniofacial patterning, and in vivo complementation assays indicate that the patient-derived variants are hypomorphic. RNA sequencing analysis from fam50a KO zebrafish show dysregulation of the transcriptome, with augmented spliceosome mRNAs and depletion of transcripts involved in neurodevelopment. Zebrafish RNA-seq datasets show a preponderance of 3’ alternative splicing events in fam50a KO, suggesting a role in the spliceosome C complex. These data are supported with transcriptomic signatures from cell lines derived from affected individuals and FAM50A protein-protein interaction data. In sum, Armfield XLID syndrome is a spliceosomopathy associated with aberrant mRNA processing during development.

ORGANISM(S): Homo sapiens

PROVIDER: GSE145710 | GEO | 2020/05/02

REPOSITORIES: GEO

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Mutations in FAM50A suggest that Armfield XLID syndrome is a spliceosomopathy (zebrafish)

Project description:Intellectual disability (ID) is a heterogeneous clinical entity and includes an excess of males who harbor variants on the X-chromosome (XLID). We report rare FAM50A missense variants in the original Armfield XLID syndrome family localized in Xq28 and four additional unrelated males with overlapping features. Our fam50a knockout (KO) zebrafish model exhibits abnormal neurogenesis and craniofacial patterning, and in vivo complementation assays indicate that the patient-derived variants are hypomorphic. RNA sequencing analysis from fam50a KO zebrafish show dysregulation of the transcriptome, with augmented spliceosome mRNAs and depletion of transcripts involved in neurodevelopment. Zebrafish RNA-seq datasets show a preponderance of 3’ alternative splicing events in fam50a KO, suggesting a role in the spliceosome C complex. These data are supported with transcriptomic signatures from cell lines derived from affected individuals and FAM50A protein-protein interaction data. In sum, Armfield XLID syndrome is a spliceosomopathy associated with aberrant mRNA processing during development.

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Interactome analysis of FAM50A via affinity purification coupled to mass spectrometry

Project description:FAM50A missense variants are present in Armfield XLID syndrome patients. Zebrafish lacking fam50a display related phenotypes and show dysregulation of the transcriptome, increased spliceosome mRNAs and a preponderance of 3’ alternative splicing events, suggesting a role for Fam50a in the spliceosome C complex. Fam50A protein-protein interaction studies show that in 293T cells FAM50A interacts with spliceosome components. In sum, aberrant mRNA processing caused by FAM50A mutation underpins Armfield XLID syndrome.

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Mutations in FAM50A suggest that Armfield XLID syndrome is a spliceosomopathy (zebrafish)

Project description:Mutations in FAM50A suggest that Armfield XLID syndrome is a spliceosomopathy (zebrafish)

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Mutations in FAM50A suggest that Armfield XLID syndrome is a spliceosomopathy (human)

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Mapping of the HUWE1 duplication at Xp11.22 in eight unrelated XLID patients

Project description:In a study to elucidate the genetic defects in patients with X-linked intellectual disability (XLID) we performed X chromosome-specific BAC-array-CGH and identified 0.33 to 1.0 Mb nonrecurrent copy number gains at Xp11.22 in affected males of unrelated XLID families. All aberrations segregate with the disease in the families and the carrier mothers show a nonrandom X-inactivation. Affected males suffered from mild to moderate ID. Tiling Xp11.22 region-specific oligo-array (ChrX:52.50 - 54.50 Mb) revealed that all aberrations had different start and stop sites. The twofold copy number gain included up to 20 genes but only the HUWE1 gene is located in the minimal common region of overlap in these families. Moreover, expression analysis revealed about twofold increased HUWE1 mRNA levels in affected patients when compared to control individuals. Breakpoint analysis revealed Non-homologous end-joining (4 cases), serial replication slippage (1 case) and non-allelic homologous recmbination (one case) as the potential recombination mechanism.

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