Homeotic protein ocelliless; Transcriptional regulator involved in pattern formation and cell determination in the embryonic CNS and larval imaginal disks. Also later in development to coordinate the expression of regulatory and structural genes required for photoreceptor cell fate in the ocelli. Has a dual role in the terminal differentiation of subtypes of photoreceptors by regulating rhodopsin (rh) expression: essential for establishing the expression of rh genes in the pale subset of ommatidia as well as repressing Rh6 in outer photoreceptors. Belongs to the paired homeobox family.

PvuII-PstI homology 13 (Pph13) encodes a paired-class homeodomain protein. It is critical for rhabdomeric photoreceptor differentiation, phototransduction and rhabdomere morphogenesis.

1-phosphatidylinositol 4,5-bisphosphate phosphodiesterase; The production of the second messenger molecules diacylglycerol (DAG) and inositol 1,4,5-trisphosphate (IP3) is mediated by activated phosphatidylinositol-specific phospholipase C enzymes (By similarity). Essential component of the phototransduction pathway. Essential downstream component of a hh-signaling pathway which regulates the Duox-dependent gut immune response to bacterial uracil; required for the activation of Cad99C and consequently Cad99C-dependent endosome formation, which is essential for the Duox-dependent product [...]

Phosrestin-2; Regulates photoreceptor cell deactivation. Arr1 and Arr2 proteins are mediators of rhodopsin inactivation and are essential for the termination of the phototransduction cascade.

Transient-receptor-potential-like protein; A light-sensitive calcium channel that is required for inositide-mediated Ca(2+) entry in the retina during phospholipase C (PLC)-mediated phototransduction. Required for vision in the dark and in dim light. Binds calmodulin. Trp and trpl act together in the light response, although it is unclear whether as heteromultimers or distinct units. Also forms a functional cation channel with Trpgamma. Activated by fatty acids, metabolic stress, inositols and GTP-binding proteins.

Phosrestin-1; Arrestin 2 (Arr2) encodes a protein involved in rhodopsin inactivation that contributes to photoreceptor maintenance and smell and sound perception.

Opsin Rh1; Neither inactivation nor afterpotential E (ninaE) encodes a protein that plays a major role in light detection and vision. It is the rhodopsin expressed in the largest class of photoreceptors in the adult retina. The stimulation by light of the product of ninaE induces G-protein signaling activation, the opening of the channels encoded by trp and trpl and photoreceptor cell membrane depolarization.

Chaoptin; Required for photoreceptor cell morphogenesis. Mediates homophilic cellular adhesion; Belongs to the chaoptin family.

Protein sevenless; Receptor for an extracellular signal required to instruct a cell to differentiate into an R7 photoreceptor. The ligand for sev is the boss (bride of sevenless) protein on the surface of the neighboring R8 cell.