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Updated: May 31, 2026
In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila
Published on: August 20, 2019
Mutation of the conserved polyadenosine RNA binding protein, ZC3H14/dNab2, impairs neural function in Drosophila and
Changhui Pak1, Masoud Garshasbi, Kimia Kahrizi
1Department of Cell Biology, Emory University School of Medicine, Atlanta, GA 30322, USA.
Abstract:
Here we report a human intellectual disability disease locus on chromosome 14q31.3 corresponding to mutation of the ZC3H14 gene that encodes a conserved polyadenosine RNA binding protein. We identify ZC3H14 mRNA transcripts in the human central nervous system, and we find that rodent ZC3H14 protein is expressed in hippocampal neurons and colocalizes with poly(A) RNA in neuronal cell bodies. A Drosophila melanogaster model of this disease created by mutation of the gene encoding the ZC3H14 ortholog dNab2, which also binds polyadenosine RNA, reveals that dNab2 is essential for development and required in neurons for normal locomotion and flight. Biochemical and genetic data indicate that dNab2 restricts bulk poly(A) tail length in vivo, suggesting that this function may underlie its role in development and disease. These studies reveal a conserved requirement for ZC3H14/dNab2 in the metazoan nervous system and identify a poly(A) RNA binding protein associated with a human brain disorder.
Insights
Mutations in the ZC3H14 gene, encoding a polyadenosine RNA binding protein, are linked to intellectual disability. This gene is crucial for nervous system development and function across species.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- Intellectual disability (ID) is a complex neurodevelopmental disorder with diverse genetic causes.
- Identifying specific gene mutations associated with ID is crucial for understanding disease mechanisms.
- Polyadenosine RNA binding proteins play vital roles in gene regulation within the nervous system.
Purpose of the Study:
- To identify the genetic basis of a human intellectual disability locus on chromosome 14q31.3.
- To investigate the function of the ZC3H14 gene and its protein product in the central nervous system.
- To explore the conserved role of ZC3H14/dNab2 in metazoan development and neurological function.
Main Methods:
- Human genetic linkage analysis to map the disease locus.
- RNA identification and protein expression studies in human and rodent tissues.
- Generation and analysis of a Drosophila melanogaster model (dnNab2 mutation).
- Biochemical and genetic assays to assess poly(A) tail length regulation.
Main Results:
- A novel human intellectual disability locus was identified at chromosome 14q31.3, linked to mutations in the ZC3H14 gene.
- ZC3H14 mRNA is present in the human central nervous system, and its protein is localized in rodent hippocampal neurons.
- The Drosophila ortholog, dNab2, is essential for development and neuronal function, regulating poly(A) tail length.
- dNab2 restricts bulk poly(A) tail length in vivo, suggesting a conserved regulatory mechanism.
Conclusions:
- Mutations in ZC3H14 cause a human intellectual disability disorder.
- ZC3H14/dNab2 is a conserved poly(A) RNA binding protein essential for metazoan nervous system development and function.
- Regulation of poly(A) tail length by ZC3H14/dNab2 is a key mechanism underlying its role in development and disease.
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