Summary of developmental expression pattern of phototransduction genes in rat pineal
| Phototransduction components | Percentage of cells expressing | Developmental time course | Expression levels |
|---|---|---|---|
| Rhodopsin | >80 | High P2–P8, | ++++ P2–P8 |
| >20× lower in adult | ++ P12–P16 | ||
| +/− P60 | |||
| Cone transducin | >80 | High P2–P8 | ++++ P2–P8 |
| Cone phosphodiesterase IRBP | 5–10× lower in adult | +++ P12–P16 | |
| +/++ P110 | |||
| Rhodopsin kinase | >80 | High P2–P110 | ++ Most cells |
| Rod arrestin | ++++ Some cells | ||
| Blue cone pigment | 5–10 | High P2–P110 | +++ |
| (low in >50%) | +/− In many cells | ||
| Rod transducin | <0.2 | Only seen at P12 | +++ |
| Rod phosphodiesterase | |||
| Recoverin | 0.3–2 | Low at P2 | + P2 |
| High at P5 | +++ P5 | ||
| Gradually lower P8–P16 | ++ P8–P16 | ||
| Low in adult | + P110 | ||
| Cone arrestin | 0.2–1 | Low at P12 | − P2–P8 |
| Higher at P16 | +/− P12 | ||
| High at P110 | + P16 | ||
| ++ P110 | |||
| Red cone pigment | 0 | None | − P2–P110 |
| Rod cyclic nucleotide-gated channel |