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Published on: January 22, 2018
Repeat sequence interspersion in coding DNA of peas does not reflect that in total pea DNA
1Department of Plant Biology, Carnegie Institution of Washington, 94305, Stanford, CA, U.S.A..
Pea genome organization differs from total DNA. Messenger RNA (mRNA) coding sequences are found in regions lacking highly repetitive DNA, unlike most other genomic sequences.
Area of Science:
- Molecular Biology
- Genomics
- Plant Science
Background:
- The pea genome exhibits extensive interspersion of repetitive and single-copy DNA sequences.
- Highly repetitive sequences are found in a large proportion of short DNA fragments from the total genome.
Purpose of the Study:
- To investigate the genomic organization of messenger RNA (mRNA) coding sequences in peas.
- To determine the proximity of mRNA coding sequences to highly repetitive DNA elements.
Main Methods:
- Analysis of DNA sequence organization in pea genome fragments.
- Characterization of repetitive and single-copy sequence distribution.
- Assessment of mRNA coding sequence location relative to repetitive elements.
Main Results:
- Messenger RNA (mRNA) coding sequences are significantly enriched in DNA fragments lacking highly repetitive sequences.
- Most mRNA coding sequences are not located within 1300 nucleotides of highly repetitive elements.
- Associated repetitive elements near mRNA coding sequences, if present, belong to low copy number families with low sequence divergence.
Conclusions:
- The genomic organization surrounding mRNA coding sequences in peas is distinct from the general genome.
- This suggests a specific regulatory or functional context for mRNA coding regions in relation to repetitive DNA.
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