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Nucleotide sequence organisation in the rye genome

D B Smith, R B Flavell

    Biochimica Et Biophysica Acta
    |January 3, 1977
    PubMed
    Summary
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    Genome sequencing in rye (Secale cereale) reveals that 25-30% are single-copy sequences interspersed with repeats. The majority, 70-75%, are repeated sequences, with varying divergence and lengths.

    Area of Science:

    • Genomics
    • Molecular Biology
    • Plant Science

    Background:

    • Understanding genome organization is crucial for plant breeding and genetics.
    • Rye (Secale cereale) possesses a complex genome with largely uncharacterized nucleotide sequence organization.

    Purpose of the Study:

    • To investigate the genome organization of nucleotide sequences in rye (Secale cereale).
    • To characterize the interspersed nature and lengths of single-copy and repeated sequences within the rye genome.

    Main Methods:

    • Renaturation kinetics analysis of rye genomic DNA.
    • S1 nuclease digestion to analyze renatured DNA products.
    • Characterization of sequence lengths and divergence under stringent conditions.

    Main Results:

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    • Approximately 25-30% of the rye genome comprises very slowly renaturing, potentially single-copy sequences (400-3500 bp), interspersed with repeats.
    • 70-75% of the genome consists of repeated sequences, including highly diverged repeats (30%, 500-5000+ bp) and less diverged repeats (40%, <800 bp).
    • A small fraction (4%) represents rapidly reannealing sequences, possibly inverted duplications, potentially clustered.

    Conclusions:

    • Rye's genome is characterized by a significant proportion of interspersed single-copy and diverse repeated sequences.
    • The study provides insights into the structural complexity and repetitive nature of the rye genome.
    • This genomic organization has implications for understanding gene regulation and evolutionary dynamics in rye.