SRD5A1 Knockout HAP1 Cell Line

The choice depends on whether you are studying SRD5A1's role in steroid 5α-reductase activity or its contributions to androgen metabolism and dihydrotestosterone (DHT) synthesis. The Knockout line is appropriate for asking whether SRD5A1 (Type I) is required for testosterone-to-DHT conversion in non-prostate tissues — SRD5A1 has broader tissue expression than SRD5A2. Overexpression is useful for testing sufficiency or for studying inhibitor selectivity between SRD5A isoforms. For steroid metabolism research, the EDITGENE SRD5A1 Knockout in HAP1 provides a clean background, though SRD5A2 and SRD5A3 paralog expression should be assessed. Note that physiological androgen metabolism research often requires prostate or skin-derived cell models — HAP1 is most useful for biochemical and inhibitor specificity studies. Rescue with wild-type or catalytically-dead SRD5A1 enables structure-function dissection, particularly relevant for distinguishing finasteride and dutasteride selectivity.

Primary applications: • Steroid metabolism assays: HPLC or LC-MS analysis of testosterone-to-DHT conversion to assess SRD5A1 enzymatic activity loss. • Finasteride/dutasteride selectivity: critical genetic control for distinguishing SRD5A1 versus SRD5A2 inhibitor activities, given finasteride's preferential SRD5A2 inhibition. • Substrate scope studies: SRD5A1 acts on progesterone and corticosteroids in addition to testosterone — analysis of broader steroid metabolism may be informative. • Paralog studies: SRD5A2 and SRD5A3 expression analysis to interpret SRD5A1-specific contributions. EDITGENE recommends this model for researchers investigating steroid 5α-reductase biology, androgen metabolism biochemistry, and 5α-reductase inhibitor selectivity.

Yes. SRD5A1 rescue experiments require attention to ER membrane targeting: • Construct design: use a codon-modified SRD5A1 sequence with a C-terminal tag (FLAG, HA). SRD5A1 is a multi-pass ER membrane protein — N-terminal tags can interfere with signal anchor function. • Catalytically-dead rescue: mutations in the conserved catalytic residues (typically targeting NADPH-binding or substrate-coordinating residues) abolish reductase activity and serve as enzymatic specificity controls. • Inhibitor-binding studies: rescue with wild-type SRD5A1 versus SRD5A2 enables direct comparison of finasteride and dutasteride selectivity in matched genetic backgrounds. • Functional readout: rescue should restore testosterone-to-DHT conversion measured by HPLC or LC-MS. HAP1-specific considerations: • Diploidization: HAP1 cells gradually diploidize during extended culture — confirm ploidy by flow cytometry at the time of phenotypic assay. • Integration site sensitivity: position effects on transgene expression are more pronounced in near-haploid backgrounds; generating multiple independent rescue clones is strongly recommended. • Transduction efficiency: HAP1 transduces with lentivirus at moderate efficiency — increase MOI compared to standard immortalized lines.