Generation of a homozygous CRISPR/Cas9-mediated knockout H9 hESC subline for the CRB1 locus

Area of Science:

• Genetics and Stem Cell Biology
• Ophthalmology and Vision Science

Background:

• Mutations in the CRB1 gene are linked to early-onset autosomal recessive retinitis pigmentosa (RP), a condition causing severe vision loss.
• Understanding the molecular mechanisms underlying CRB1-related RP is crucial for developing potential therapeutic strategies.

Purpose of the Study:

• To investigate the pathogenic mechanisms of CRB1-knockout (CRB1^-/-) induced RP.
• To generate and characterize a human embryonic stem cell (hESC) model for studying CRB1-related retinal degeneration.

Main Methods:

• Generation of a H9 hESC subline with homozygous frame shift mutations in exon 2 of the CRB1 gene.
• Assessment of pluripotency markers, karyotype stability, and differentiation potential into all three germ layers (endoderm, mesoderm, ectoderm).

Main Results:

• The generated CRB1^-/- hESC subline successfully expressed key pluripotent stem cell markers.
• The cells maintained a normal karyotype, indicating genomic stability.
• The CRB1^-/- hESCs demonstrated the capacity to differentiate into endodermal, mesodermal, and ectodermal lineages, similar to wild-type cells.

Conclusions:

• The developed CRB1^-/- hESC line serves as a valuable in vitro model for studying the pathogenesis of CRB1-associated RP.
• Despite the CRB1 gene mutation, the hESC subline retains essential stem cell characteristics, facilitating further research into retinal cell development and disease mechanisms.