Abstract
The frequency classes and organization of the main component (mc) DNA of a crustacean, the land crab, Gecarcinus lateralis, have been characterized. The reassociation kinetics of 380 nucleotide long mcDNA fragments show that approximately 50% contain sequences repeated more than 800 times. Present in few, if any, copies are sequences repeated from 2 to 800 times. The remainder of the DNA reassociates as single copy sequences with a rate constant consistent with the organism's genome size. The reassociation kinetics of highly sheared DNA fragments of every true crab studied (Vaughn, 1975; Christie et al., 1976) are similar to each other and different from those of other invertebrate DNAs (Goldberg et al., 1975). Each of these genomes has a paucity of sequences repeated from 10 to 800 times and an abundance of highly repeated sequences. To determine if sequences repeated more than 800 times are interspersed with single copy sequences, we examined the arrangement of repetitive and non-repetitive sequences in mcDNA. The reassociation and melting properties of partially duplex mcDNA fragments of increasing lengths show that at least 75% of the DNA is organized in an interspersed pattern. In this pattern, single copy sequences with an average length of 800–900 nucleotides are interspersed with repetitive sequences. S1 nuclease digestion of reassociated 3100 nucleotide fragments indicates that ∼44% of the mcDNA is repetitive and that one-third of the repetitive sequences (average length=285 nucleotides) are interspersed with single copy sequences. We conclude that repetitive sequencies are interspersed with most of the single copy sequences in an interspersion pattern similar to that of Xenopus rahter than to that of another arthropod, Drosophila.
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Holland, C.A., Skinner, D.M. The organization of the main component DNA of a crustacean genome with a paucity of middle repetitive sequences. Chromosoma 63, 223–240 (1977). https://doi.org/10.1007/BF00327451
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DOI: https://doi.org/10.1007/BF00327451