The CH3A4A7 monoclonal antibody reacts with an extracellular epitope on human CD344 which is also known as Frizzled family receptor 4 (FZD4) or Frizzled-4. CD344 is a member of the Frizzled family of proteins within the G protein-coupled receptor (GPCR) superfamily. CD344 is a receptor for Wnt proteins and participates in the activation of the Wnt/beta-catenin pathway (canonical Wnt signaling). Patients with familial exudative vitreoretinopathy (FEVR) carry mutations in Frizzled-4. This disease is characterized by retinal degeneration and hearing loss. On tissues, CD344 is almost ubiquitously expressed. CD344 is highly expressed in adult heart and skeletal muscle.
The antibody was conjugated to BD Horizon™ BUV496 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome of BD Horizon BUV395 with an Ex Max of 348-nm and an acceptor dye with an Em Max at 496-nm. BD Horizon BUV496 can be excited by the ultraviolet laser (355 nm) and detected with a 515/30 nm filter with a 450LP. Due to the excitation of the acceptor dye by other laser lines, there may be significant spillover into the channel detecting BD Horizon V500 or BV510 (eg, 525/40-nm filter). However, the spillover can be corrected through compensation as with any other dye combination.