The IGHA1 Knockout HEK293T Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the HEK293T human embryonic kidney epithelial cell line. This model features targeted disruption of the IGHA1 gene, which encodes the constant region of the immunoglobulin alpha heavy chain 1, an essential component of IgA1 antibodies. The polyclonal format provides a heterogeneous mixture of edited cells, offering a robust platform for studying IgA1 function without the constraints of clonal selection. The knockout is achieved through CRISPR/Cas9-mediated gene disruption, generating a loss-of-function model suitable for diverse immunological investigations.
HEK293T cells are a widely utilized epithelial-like cell line originally derived from human embryonic kidney and immortalized through transformation with adenovirus 5 DNA. They stably express the SV40 large T-antigen, which enhances episomal replication of plasmids containing the SV40 origin, leading to elevated protein expression and high transfection efficiency. These characteristics make HEK293T an ideal host for gene editing, protein production, and viral packaging applications. Their robust growth and well-characterized biology provide a reliable context for knockout studies, enabling reproducible experimental outcomes.
IGHA1 encodes the constant region of the IgA1 heavy chain, pivotal for mucosal immunity and pathogen neutralization. The IgA class switching is regulated by upstream signals including TGF-beta, IL-10, BAFF, APRIL, and CD40 ligand, which activate transcription factors such as NF-kB, SMAD2/3, and IRF4. Downstream, IgA1 antibodies interact with the Fc alpha receptor (FCAR/CD89) to trigger phagocytosis, respiratory burst, and cytokine secretion (e.g., TNF-alpha, IL-6). Other key interacting partners include the polymeric immunoglobulin receptor (PIGR), J chain, and secretory component, which facilitate IgA transcytosis and secretion. Representative pathway components such as AICDA, PAX5, and the Ialpha promoter further orchestrate B cell-specific expression and class switch recombination.
Although HEK293T cells do not endogenously produce IgA, the IGHA1 knockout in this cell line serves as a critical tool for dissecting IgA1-mediated mechanisms when combined with ectopic expression of wild-type or mutant IgA1 constructs. This model is particularly valuable for studying IgA nephropathy, where aberrant IgA1 glycosylation and immune complex formation are central. By eliminating endogenous IGHA1 background, researchers can precisely evaluate the impact of specific IgA1 variants on Fc??RI signaling, antigen presentation, and downstream inflammatory responses. The polyclonal nature mitigates clone-specific artifacts, ensuring broader representation of knockout effects.
This knockout cell model enables a wide array of applications, including screening of IgA-binding molecules, assessment of Fc??RI-mediated signaling using flow cytometry and co-immunoprecipitation, and investigation of IgA1 interactions with streptococcal IgA-binding proteins or IgA1-specific proteases. It is suited for functional assays such as ELISA for IgA1 detection (upon transient expression), Western blotting to verify protein loss, and RT-qPCR or Sanger sequencing for genotype confirmation. Additionally, the cells can serve as a substrate for producing IgA-deficient viral vectors or recombinant proteins. For further information and to place an order, please contact Ascent Research.
