Stable haploid cultured cell lines from frog embryos.

Area of Science:

• Amphibian cell culture
• Developmental biology
• Genetics

Background:

• Establishing stable haploid cell lines is crucial for genetic research.
• Previous attempts to culture amphibian haploid cells have faced challenges with stability and overgrowth by diploid variants.

Purpose of the Study:

• To establish and characterize long-term, viable haploid cell lines from Rana pipiens.
• To assess the growth characteristics and genetic stability of these novel haploid cell lines.
• To evaluate their potential for genetic studies in cell culture.

Main Methods:

• Haploid cell lines were derived from androgenetic Rana pipiens embryos.
• Cells were cultured in a defined basal medium supplemented with an exogenous purine source.
• Karyotype analysis was performed to assess chromosomal stability.
• Growth characteristics, including morphology and plating efficiency, were documented.
• Competition experiments with diploid variants were conducted.

Main Results:

• Two distinct haploid cell lines were successfully maintained for 150 and 200 generations.
• Karyotypes were largely consistent with the standard Rana pipiens karyotype, with minor chromosomal length variations.
• Both lines exhibited prolonged multiplication, resembling permanent cell lines.
• One line displayed epithelial-like growth, while the other showed fibroblast-like morphology.
• Both lines demonstrated low plating efficiency, characteristic of unaltered cells.
• These haploid lines successfully competed with diploid variants, a rare trait.

Conclusions:

• The established Rana pipiens haploid cell lines are stable and exhibit robust growth.
• Their ability to outcompete diploid variants makes them exceptionally valuable for research.
• The RPH 68.2A cell line, in particular, offers a promising resource for amphibian genetic studies in vitro.