CMAS Knockout HAP1 Cell Line

The choice depends on whether you are studying CMAS (cytidine monophosphate N-acetylneuraminic acid synthetase, CMP-Neu5Ac synthase)'s role as the principal sialic acid activation enzyme or modeling its functions in sialic acid-dependent glycobiology. The Knockout line is the standard tool for asking whether CMAS is required for these processes — CMAS catalyzes the activation of N-acetylneuraminic acid (Neu5Ac) to CMP-Neu5Ac, the donor substrate for all sialyltransferases that add sialic acid to glycoproteins, glycolipids, and gangliosides; CMAS is the obligate enzyme for sialylation, making it a central player in glycobiology. Overexpression is useful for studying CMAS in heterologous expression contexts. For glycobiology research, the EDITGENE CMAS Knockout in HAP1 is highly informative — CMAS loss eliminates virtually all cellular sialylation, generating an asialo cellular surface; CMAS biallelic loss-of-function mutations cause a congenital disorder of glycosylation with developmental delay. Rescue with wild-type or catalytically-dead CMAS enables structure-function studies. The knockout is a critical specificity tool for studying sialic acid-dependent processes (Siglec receptor recognition, viral entry, cell-cell interaction) and emerging glycobiology research.

Primary applications: • Cellular sialylation: lectin staining (SNA for α2,6-sialic acid; MAA for α2,3-sialic acid) and surface glycoprotein sialylation analysis in CMAS-null cells. • Siglec recognition: in heterologous Siglec-relevant contexts, characterization of sialic acid-dependent receptor recognition. • Viral entry: in heterologous viral entry contexts, sialic acid-dependent virus binding studies (influenza, several human coronaviruses use sialic acid receptors). • Congenital disorder of glycosylation modeling: rescue with patient-derived CMAS mutations for genotype-function studies. EDITGENE recommends this model for researchers investigating glycobiology, sialic acid biology, and CMAS-deficient cellular phenotypes.

Yes. CMAS rescue experiments are well-established for glycobiology research: • Construct design: use a codon-modified CMAS sequence with a small C-terminal tag (FLAG, HA). CMAS has the canonical nucleotide sugar synthase architecture — preserve protein integrity. • Catalytically-dead rescue: active site residue mutations abolish CMP-Neu5Ac synthesis activity. • Functional readout: rescue should restore cellular sialylation measured by SNA/MAA lectin staining. 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.