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Novel putative fragile sites observed in feline fibroblasts treated with aphidicolin and fluorodeoxyuridine
1Laboratories of Veterinary Radiology, Osaka Prefecture University, Japan.
Abstract:
Fragile sites are non-randomly distributed chromosomal breaks and gaps observed in the cells cultivated under certain conditions. Feline fragile sites were analyzed using skin fibroblast strains after the treatments with aphidicolin and fluorodeoxyuridine in combination with caffeine. Three aphidicolin-induced fragile sites (A1q21, C2q13 and E1p21) as well as a folate-sensitive site (B1q14) were observed in all the 3 fibroblast strains tested for each treatment group. The loci in A1q21 and B1q14 are very close to that reported previously for peripheral blood lymphocytes and lung cells. Two chromosomal break points in C2q13 and E1p21 seem to be new fragile sites. Fifteen candidates for feline fragile sites were also assigned their locations in feline chromosomes. Both the incidence and distribution of feline fragile sites in skin fibroblasts seem to be different at least in part from those in lymphocytes.
Insights
This study identified new feline fragile sites in skin fibroblasts using specific chemical treatments. Findings suggest differences in fragile site distribution compared to other feline cell types.
Area of Science:
- Cytogenetics
- Genetics
- Mammalian Cell Biology
Background:
- Fragile sites are non-random chromosomal regions prone to breakage.
- Understanding fragile sites is crucial for genetic research and disease association.
- Previous feline fragile site studies primarily focused on lymphocytes and lung cells.
Purpose of the Study:
- To characterize feline fragile sites in skin fibroblast cell strains.
- To identify novel fragile site locations in the feline genome.
- To compare fragile site patterns in fibroblasts with those in other feline cell types.
Main Methods:
- Culturing feline skin fibroblast strains.
- Treating cells with aphidicolin and fluorodeoxyuridine (FUDR) combined with caffeine.
- Analyzing chromosomal preparations for breaks and gaps to identify fragile sites.
Main Results:
- Identified three aphidicolin-induced fragile sites (A1q21, C2q13, E1p21) and one folate-sensitive site (B1q14).
- Observed that A1q21 and B1q14 loci are consistent with previously reported locations.
- Discovered two potential new fragile sites at C2q13 and E1p21.
- Mapped fifteen candidate feline fragile sites to specific chromosomal locations.
- Noted differences in the incidence and distribution of fragile sites in fibroblasts compared to lymphocytes.
Conclusions:
- Feline skin fibroblasts exhibit distinct fragile site profiles.
- The identified fragile sites provide valuable markers for feline chromosomal mapping.
- Further research is warranted to explore the functional significance of these feline fragile sites.
