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A Germline Variant in the PANX1 Gene Has Reduced Channel Function and Is Associated with Multisystem Dysfunction
Qing Shao1, Kristin Lindstrom2, Ruoyang Shi3
1Department of Anatomy and Cell Biology, The University of Western Ontario, London, Ontario N6A 5C1, Canada.
The Journal of Biological Chemistry
|April 30, 2016
Summary
Pannexin1 (PANX1) loss-of-function variants cause a new genetic disorder. This study identifies the first patient with a PANX1 missense variant linked to intellectual disability, hearing loss, and skeletal defects.
Area of Science:
- Genetics and Molecular Biology
- Neuroscience
- Cell Biology
Background:
- Pannexin1 (PANX1) functions as an ATP release channel crucial for paracrine signaling.
- Ubiquitous PANX1 expression suggests pathogenic variants could impact multiple organ systems.
Observation:
- Whole exome sequencing identified a novel homozygous PANX1 variant (c.650G→A, p.Arg217His) in a patient with a complex phenotype.
- The patient presented with intellectual disability, sensorineural hearing loss, skeletal defects (kyphoscoliosis), and primary ovarian failure.
Findings:
- Functional assays confirmed p.Arg217His as a loss-of-function variant, with no dominant-negative effect on wild-type PANX1.
- Cellular studies showed normal glycosylation and trafficking of the mutant PANX1 protein.
Implications:
- This research reports the first human disease associated with a PANX1 missense variant, defining a new genetic disorder.
- Understanding PANX1 channel function in disease opens avenues for diagnosing and potentially treating related neurological and developmental conditions.
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