Abstract
Chromosomes derived from rat kidney cells were separated in specially designed sedimentation chambers by velocity sedimentation at 30 g. The DNA of the chromosomal fractions was used in molecular hybridization experiments to localize single-copy genes on the fractionated rat chromosomes. By cross-hybridization with a mouse immunoglobulin light chain kappa c-DNA probe, the rat immunoglobulin genes were detected only on the DNA of chromosomal fractions highly enriched for chromosomes 3, 4 and 5. The rat albumin gene was detected on fractions greatly enriched for chromosomes 11, 13 and 14. The described method allows the localization of structural genes or introduced DNA sequences on the chromosomal level especially in those cell systems in which no suitable somatic cell hybrids are available.
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