Generation of human embryonic stem cell line with heterozygous RB1 deletion by CRIPSR/Cas9 nickase

Area of Science:

• Genetics
• Stem Cell Biology
• Cancer Research

Background:

• The Retinoblastoma 1 (RB1) tumor suppressor is vital for cell cycle regulation and is frequently mutated in retinoblastoma.
• Germline mutations or deletions in RB1 are found in approximately one-third of retinoblastoma patients, leading to tumor development.
• Understanding RB1's function is critical for developing therapeutic strategies against retinoblastoma.

Purpose of the Study:

• To generate a heterozygous knockout of the RB1 gene in a human embryonic stem cell line.
• To characterize the resulting cell line for its potential use in retinoblastoma research.
• To validate the application of CRISPR/Cas9 nickase technology for targeted gene editing in pluripotent stem cells.

Main Methods:

• CRISPR/Cas9 nickase genome editing was employed to create a heterozygous deletion of the RB1 gene.
• The H1 human embryonic stem cell line was utilized for gene editing.
• Standard cell culture and molecular biology techniques were used for characterization.

Main Results:

• A heterozygous knockout of the RB1 gene was successfully generated in the H1 cell line.
• The RB1 heterozygous knockout H1 cell line exhibited a normal karyotype.
• The modified cell line maintained its pluripotent state and demonstrated the capacity for differentiation into the three primary germ layers.

Conclusions:

• The generated RB1 heterozygous knockout H1 cell line serves as a valuable preclinical model for studying retinoblastoma.
• CRISPR/Cas9 nickase editing is an effective method for creating targeted gene deletions in human embryonic stem cells.
• This research provides a foundation for further investigation into RB1's role in development and disease.