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DNA sequence organization in the genome of Cycas revoluta

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Abstract

The pattern of DNA sequence organization in the genome of Cycas revoluta was analyzed by DNA/DNA reassociation. Reassociation of 400 base pair (bp) fragments to various C0t values indicates the presence of at least four kinetic classes: the foldback plus very highly repetitive sequences (15%), the fast repeats (24%), the slow repeats (44%), and the single copy (17%). The latter component reassociates with a rate constant 1×10−4 M−1S−1 corresponding to a complexity of 1.6× 106 kb per haploid genome. A haploid C. revoluta nucleus contains approximately 10.3 pg DNA. The single-copy sequences account for about 28% of the DNA, but only 17% reassociate with single-copy kinetics because of interspersion with repetitive sequences. — The interspersion of repetitive and single-copy sequences was examined by reassociation of DNA fragments of varying length to C0t values of 70 and 500. A major (65%) and homogeneous class of single-copy sequences averaging 1,100 bp in length is interspersed in a short period pattern with repeated sequences. A minor (35%) heterogeneous single-copy component is interspersed in a long-period pattern. The majority of repetitive sequences have a length distribution of 100–350 bp with subclasses averaging 150 and 300 bp in length. Repeat sequences with a wide range in sizes exceeding 2 kilobase pair (kb) are also present in this genome. — The size and distribution of inverted repeat (ir) sequences in the DNA of C. revoluta were studied by electron microscopy. It is estimated that there are approximately 4 × 106 ir pairs (one per 2.33 kb) that form almost equal numbers of looped and unlooped palindromes. This high value is 2.5 times that found in wheat DNA. These palindromes are in general randomly distributed in the genome with an average interpalindrome distance of 1.6 kb. The majority (about 85%) of ir sequences of both types of palindromes belong to a main-size class, with an average length of 210 bp in the unlooped and and 163 bp in the looped type. These values are comparable to those reported for some other plant and animal genomes. Distribution of length of single stranded loops showed a main-size class (75%) with an average length of 220 bp.

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Authors and Affiliations

  1. Biology Department, American University of Beirut, Beirut, Lebanon

    Buran Kurdi-Haidar, Victoria Shalhoub, Sulayman Dib-Hajj & Samir Deeb

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  1. Buran Kurdi-Haidar
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  2. Victoria Shalhoub
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  3. Sulayman Dib-Hajj
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  4. Samir Deeb
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Kurdi-Haidar, B., Shalhoub, V., Dib-Hajj, S. et al. DNA sequence organization in the genome of Cycas revoluta . Chromosoma 88, 319–327 (1983). https://doi.org/10.1007/BF00285854

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  • DOI: https://doi.org/10.1007/BF00285854

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