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RETINA Publication-derived

Efficient Stage-Specific Differentiation of Human Pluripotent Stem Cells Toward Retinal Photoreceptor Cells

Source Mellough et al., 2012 · Institute of Genetic Medicine, Newcastle University · 10.1002/stem.1037

👤 Carla B. Mellough, Evelyne Sernagor, Inmaculada Moreno-Gimeno, David H.W. Steel, Majlinda Lako ⏱ 60 days 📋 5 phases 🧫 Human hESC (H9 line), Human iPSC derived from neonatal dermal skin fibroblasts

Abstract

This protocol describes a three-step, 60-day differentiation method to efficiently generate retinal photoreceptors from human embryonic stem cells (hESC) and induced pluripotent stem cells (hiPSC). The protocol combines ventral neural induction, retinal field specification, and photoreceptor maturation stages, achieving sequential expression of photoreceptor markers including mature markers OPN1SW and RHODOPSIN with higher efficiency than previously published methods. The protocol demonstrates that B27 and N2 supplements play key roles in photoreceptor differentiation, and that further maturation can proceed under minimal culture conditions.

Cell source
Human hESC (H9 line), Human iPSC derived from neonatal dermal skin fibroblasts
Application
Photoreceptor cell generation for disease modeling and cell replacement therapy

Protocol overview

21 steps across 5 phases

hESC/hiPSC Maintenance and Embryoid Body Formation Days 0–0 (prior to differentiation onset)
  1. 1 Preparation of pluripotent stem cell culture substrate
  2. 2 Harvest pluripotent stem cell clumps
  3. 3 Initiate embryoid body culture
Ventral Neural Induction and Early Retinal Specification (Floating EB Culture) Days 0–30
  1. 1 Establish basal ventral neural induction media (VNIM) for control cultures
  2. 2 Supplement photoreceptor-induction (PR) cultures with early-stage mitogens and antagonists (Days 0–30)
  3. 3 Optional: Establish minimal control cultures (no B27/N2)
  4. 4 Maintain EB suspension culture and media changes
  5. 5 Observe emergence of pigmented foci and retinal phenotypes
Transition to Adherent Culture and Early Photoreceptor Specification Days 30–37
  1. 1 Prepare adherent culture substrate
  2. 2 Transfer EB suspension cultures to adherent conditions
  3. 3 Continue media supplementation (days 30–37) with KOSR-free basal formula
  4. 4 Continue PR-induction supplementation (days 30–37)
  5. 5 Observe neural and epithelial morphology development
Photoreceptor Precursor Maturation and Exit from Cell Cycle (Days 37–41) Days 37–41
  1. 1 Supplement PR-induction media with Activin-A (Days 37–41 only)
  2. 2 Maintain all other media components from phase 3
  3. 3 Monitor culture morphology for differentiation progression
Late Photoreceptor Maturation and Functional Marker Expression Days 41–60
  1. 1 Remove Activin-A and continue PR-induction supplementation (Days 41–60)
  2. 2 Maintain cultures until day 60 with regular media changes
  3. 3 Optional: Test minimal media conditions after day 37 for enhanced maturation
  4. 4 Observe peak photoreceptor marker expression (days 45–50)
  5. 5 Harvest cultures at day 60 for analysis

Full SOP

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Attribution

This SOP was authored by Organthis based on the published method in Mellough et al., 2012. The originating laboratory holds no rights in this SOP and has not endorsed it unless marked Verified.

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