A comparison of NIH-approved human ESC lines.

Area of Science:

• Stem Cell Biology
• Developmental Biology
• Genetics

Background:

• The National Institutes of Health (NIH) established Exploratory Centers for Human Embryonic Stem Cell Research in 2003.
• Access to NIH-approved human embryonic stem cell (hESC) lines is crucial for advancing regenerative medicine and disease modeling.

Purpose of the Study:

• To assess the quality and characteristics of NIH-approved hESC lines.
• To evaluate the variability in growth, gene expression, and genetic stability among different hESC lines.
• To identify optimal culture conditions and potential barriers to hESC research.

Main Methods:

• Acquired 15 of 22 NIH-approved hESC lines.
• Tested for mycoplasma contamination, gene expression, adaptability to uniform culture, clonal growth, karyotype, growth efficiency, and transfection efficiency.
• Characterized nine lines extensively.

Main Results:

• One hESC line was contaminated with mycoplasma.
• Significant variability was observed in growth efficiency (31-57 hours doubling time), cloning efficiency (0.8%-9.2%), and transfection rates (0%-53%).
• One line exhibited an unstable karyotype; modifications to Material Transfer Agreements were needed.

Conclusions:

• NIH-approved hESC lines display marked heterogeneity in their biological properties.
• Many hESC lines can be cultured under less demanding conditions than recommended.
• Intellectual property issues and material transfer agreements present significant obstacles to hESC research accessibility.