Modeling human retinal development with patient-specific induced pluripotent stem cells reveals multiple roles for visual system homeobox 2.

TitleModeling human retinal development with patient-specific induced pluripotent stem cells reveals multiple roles for visual system homeobox 2.
Publication TypeJournal Article
Year of Publication2014
AuthorsM Phillips J, Perez ET, Martin JM, Reshel ST, Wallace KA, Capowski EE, Singh R, Wright LS, Clark EM, Barney PM, Stewart R, Dickerson SJ, Miller MJ, E Percin F, Thomson JA, Gamm DM
JournalStem Cells
Volume32
Issue6
Pagination1480-92
Date Published2014 Jun
ISSN1549-4918
Abstract

Human induced pluripotent stem cells (hiPSCs) have been shown to differentiate along the retinal lineage in a manner that mimics normal mammalian development. Under certain culture conditions, hiPSCs form optic vesicle-like structures (OVs), which contain proliferating progenitors capable of yielding all neural retina (NR) cell types over time. Such observations imply conserved roles for regulators of retinogenesis in hiPSC-derived cultures and the developing embryo. However, whether and to what extent this assumption holds true has remained largely uninvestigated. We examined the role of a key NR transcription factor, visual system homeobox 2 (VSX2), using hiPSCs derived from a patient with microphthalmia caused by an R200Q mutation in the VSX2 homeodomain region. No differences were noted between (R200Q)VSX2 and sibling control hiPSCs prior to OV generation. Thereafter, (R200Q)VSX2 hiPSC-OVs displayed a significant growth deficit compared to control hiPSC-OVs, as well as increased production of retinal pigmented epithelium at the expense of NR cell derivatives. Furthermore, (R200Q)VSX2 hiPSC-OVs failed to produce bipolar cells, a distinctive feature previously observed in Vsx2 mutant mice. (R200Q)VSX2 hiPSC-OVs also demonstrated delayed photoreceptor maturation, which could be overcome via exogenous expression of wild-type VSX2 at early stages of retinal differentiation. Finally, RNAseq analysis on isolated hiPSC-OVs implicated key transcription factors and extracellular signaling pathways as potential downstream effectors of VSX2-mediated gene regulation. Our results establish hiPSC-OVs as versatile model systems to study retinal development at stages not previously accessible in humans and support the bona fide nature of hiPSC-OV-derived retinal progeny.

DOI10.1002/stem.1667
Alternate JournalStem Cells
PubMed ID24532057
PubMed Central IDPMC4037340
Grant ListP30HD03352 / HD / NICHD NIH HHS / United States
R01 EY021218 / EY / NEI NIH HHS / United States
R01EY21218 / EY / NEI NIH HHS / United States