Abstract
A BclI restriction-fragment-length variation (RFLV) has been identified 7 kb downstream of the 3′ end of the adenine phosphoribosyltransferase (aprt) gene in the Chinese hamster CHO cell line. This RFLV generates 19 kb and 17 kb+2 kb BclI fragments. Three other cell lines derived from different Chinese hamsters are homozygous for this RFLV. The 17 kb+2 kb allele was mapped to the Z4 chromosome based upon the absence of this allele in the CHO-derived hemizygote AA8-5, whose functional allele is known to map to chromosome Z7. The class 2aprt +/-line D416 loses the 19-kb allele after undergoing the high-frequency (HF) deletion event, indicating that the HF deletion event occurs on the Z7 chromosome. On the other hand, deletion events in the class 3 heterozygote D423 (which do not spontaneously occur at HF) resulted in loss of the 17 kb+2 kb allele. This is consistent with a previously proposed model holding that the twoaprt alleles in the CHO cell line have different inherent probabilities of undergoing a large deletion event.
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Dewyse, P., Bradley, W.E.C. Loss of alleles inaprt mutants of CHO cells demonstrated by BclI restriction-fragment-length variation. Somat Cell Mol Genet 16, 225–230 (1990). https://doi.org/10.1007/BF01233358
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DOI: https://doi.org/10.1007/BF01233358