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Updated: Jun 4, 2026

Novel Sequence Discovery by Subtractive Genomics
Published on: January 25, 2019
The Bryopsis hypnoides plastid genome: multimeric forms and complete nucleotide sequence
1Institute of Oceanology, The Chinese Academy of Sciences (IOCAS), Qingdao, China.
The chloroplast genome of Bryopsis hypnoides was sequenced, revealing 111 genes and an IR-lacking structure similar to Chlorella vulgaris. Multimeric forms of cpDNA were observed, suggesting replication intermediates rather than recombination.
Area of Science:
- Marine Botany
- Molecular Biology
- Genomics
Background:
- Bryopsis hypnoides is a siphonous green alga known for its autonomous chloroplasts.
- The chloroplast is the largest organelle in B. hypnoides cells.
Purpose of the Study:
- To sequence and analyze the chloroplast genome of Bryopsis hypnoides.
- To understand the structural organization and evolutionary relationships of the B. hypnoides chloroplast.
Main Methods:
- Chloroplast genome sequencing and analysis.
- Pulsed-field gel electrophoresis (PFGE) and southern blotting for cytogenomic investigation.
- Phylogenetic analyses using chloroplast protein sequences.
Main Results:
- A total of 111 functional genes were identified in the 153,429 bp chloroplast DNA (cpDNA).
- The B. hypnoides cpDNA exhibits an inverted-repeat (IR)-lacking structure, similar to Chlorella vulgaris.
- Cytogenomic analysis revealed multimeric forms (monomer to higher multimers) of cpDNA, suggesting a unique higher-order organization.
Conclusions:
- The autonomy of B. hypnoides chloroplasts is not directly correlated with cpDNA size or gene content.
- The IR-lacking structure and multimeric cpDNA forms suggest random cleavage and fusion of replication intermediates, not recombination.
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