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Updated: Dec 14, 2025
06:35
A Scalable, Cell-Based Method for the Functional Assessment of Ube3a Variants
Published on: October 10, 2022
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Functional Genomics of ABCA3 Variants.
Jennifer A Wambach1, Ping Yang1, Daniel J Wegner1
1Edward Mallinckrodt Department of Pediatrics.
Summary
Rare biallelic variants in the ATP-binding cassette transporter A3 (ABCA3) gene cause severe lung disease. Researchers developed a new cell model to study these ABCA3 variants and find potential therapies.
Area of Science:
- Genetics and Genomics
- Cell Biology
- Respiratory Medicine
Background:
- Biallelic variants in the ATP-binding cassette transporter A3 (ABCA3) gene are a leading genetic cause of neonatal respiratory failure and childhood interstitial lung disease.
- Over 200 disease-associated ABCA3 variants have been identified, but fewer than 10% have been functionally characterized, with most being missense variants.
- Current therapies for ABCA3-related lung diseases are limited and nonspecific, highlighting the need for a platform to characterize variants and discover pharmacologic correctors.
Purpose of the Study:
- To develop a scalable and versatile cell-based platform for the functional characterization of ATP-binding cassette transporter A3 (ABCA3) variants.
- To identify potential pharmacologic correctors for ABCA3-related lung diseases.
- To investigate the mechanisms by which ABCA3 variants disrupt protein function and cellular processes.
Main Methods:
- Endogenous ABCA3 was silenced in A549 cells using CRISPR/Cas9 genome editing.
- A parent cell line (A549/ABCA3) was generated for stable expression of ABCA3 variant cDNAs via lentiviral integration, FACS, and dilutional cloning.
- Functional characterization of ABCA3 variants (p.L101P, p.E292V, p.G1421R) was performed by comparing protein processing, immunofluorescence, vesicle phenotype, and pharmacologic rescue in the developed cell line and primary human alveolar type II cells.
Main Results:
- The A549/ABCA3 cell line accurately recapitulated the functional defects of known ABCA3 missense variants (type I and type II) compared to primary human cells.
- Pharmacologic rescue of mistrafficking and vesicle diameter was demonstrated in A549/ABCA3 cells expressing the type I variant p.G1421R.
- The developed cell line provides a physiologically relevant platform for ABCA3 variant functional genomics and drug screening.
Conclusions:
- The A549/ABCA3 cell line is a scalable, genetically versatile, and physiologically relevant platform for functional genomics of ABCA3 variants.
- This platform enables the discovery of variant-specific mechanisms disrupting ABCA3 function.
- The platform facilitates the screening of potential pharmacologic correctors for ABCA3-related lung diseases.
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