High-throughput Functional Genomics Identifies Regulators of Primary Human Beta Cell Proliferation

Area of Science:

• Cell Biology
• Regenerative Medicine
• Genetics

Background:

• Regenerative therapy requires understanding and controlling the proliferation of non-transformed human cells.
• Complex regulatory mechanisms govern cell proliferation, posing challenges for therapeutic applications.
• Primary cells, particularly quiescent adult human pancreatic beta cells, are critical for regenerative strategies but difficult to expand.

Purpose of the Study:

• To develop a high-throughput RNAi screening strategy applicable to primary human cells.
• To identify genetic targets that can promote the proliferation of quiescent adult human pancreatic beta cells.
• To explore the therapeutic potential of functional genetic screens in primary cells.

Main Methods:

• Development of a high-throughput RNA interference (RNAi) screening strategy.
• Application of the screening strategy to primary human cells, specifically quiescent adult pancreatic beta cells.
• Genetic dissection of regulatory mechanisms controlling cell proliferation.

Main Results:

• Successful development and implementation of a high-throughput RNAi screen for primary cells.
• Silencing of cyclin-dependent kinase inhibitors CDKN2C/p18 or CDKN1A/p21 was shown to facilitate cell cycle entry in quiescent adult human pancreatic beta cells.
• Identification of p18 and p21 as novel targets for promoting human beta cell proliferation.

Conclusions:

• p18 and p21 are identified as key targets for enhancing human beta cell proliferation.
• The developed high-throughput RNAi screening strategy is effective for dissecting therapeutically relevant state changes in primary human cells.
• This approach holds promise for advancing regenerative therapies by enabling the expansion of critical primary cell populations.