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Updated: Sep 13, 2026
Functional Cloning Using a Xenopus Oocyte Expression System
Published on: January 30, 2016
Molecular cloning and developmental expression of two Chloride Intracellular Channel (CLIC) genes in Xenopus laevis
Boris Y Shorning1, Duncan B Wilson, Richard R Meehan
1Division of Biomedical Sciences, College of Medicine, University of Edinburgh, George Square, Edinburgh EH8 9XD, Scotland, UK.
Abstract:
CLIC proteins are components or regulators of novel intracellular anion channels in mammalian cells, and previous studies have suggested that human nuclear membrane-associated CLIC1 and mouse inner mitochondrial membrane CLIC4 are involved in cell division and apoptosis. We have isolated Xenopus homologues of CLIC1 and CLIC4 and shown them to be well conserved during chordate evolution, but poorly conserved in invertebrates. Consistent with fundamental cellular roles, Xenopus CLIC genes are expressed at every stage of embryonic development. Expression is localised to mesodermal and ectodermal tissues, with particularly marked expression of xCLIC4 in the developing nervous system. This is the first description of non-mammalian CLIC expression, and use of Xenopus laevis as a model organism may provide insights into the role of CLIC-associated ion channels in animal development.
Insights
Researchers identified Xenopus CLIC1 and CLIC4 proteins, crucial for intracellular anion channels. Their expression across embryonic development in Xenopus laevis offers new insights into CLIC protein functions in animal development.
Area of Science:
- Cell Biology
- Developmental Biology
- Molecular Biology
Background:
- Chloride intracellular channel (CLIC) proteins regulate anion channels in mammalian cells.
- CLIC1 and CLIC4 are implicated in cell division and apoptosis in mammals.
Purpose of the Study:
- To isolate and characterize Xenopus homologues of CLIC1 and CLIC4.
- To investigate the expression patterns of Xenopus CLIC genes during embryonic development.
Main Methods:
- Isolation of Xenopus CLIC1 and CLIC4 genes.
- Analysis of gene conservation across different species.
- Whole-mount in situ hybridization to determine gene expression localization in Xenopus embryos.
Main Results:
- Xenopus CLIC1 and CLIC4 homologues were identified and found to be highly conserved in chordates but poorly conserved in invertebrates.
- Xenopus CLIC genes are expressed throughout embryonic development, with specific localization in mesodermal and ectodermal tissues.
- xCLIC4 shows particularly strong expression in the developing nervous system.
Conclusions:
- This study provides the first description of non-mammalian CLIC gene expression.
- Xenopus laevis serves as a valuable model organism for studying the roles of CLIC proteins and associated ion channels in vertebrate development.
