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Title: High-throughput sequencing of the chloroplast and mitochondrion of Chlamydomonas reinhardtii to generate improved de novo assemblies, analyze expression patterns and transcript speciation, and evaluate diversity among laboratory strains and wild isolates

Journal Article · · The Plant Journal
DOI:https://doi.org/10.1111/tpj.13788· OSTI ID:1922676

Summary Chlamydomonas reinhardtii is a unicellular chlorophyte alga that is widely studied as a reference organism for understanding photosynthesis, sensory and motile cilia, and for development of an algal‐based platform for producing biofuels and bio‐products. Its highly repetitive, ~205‐kbp circular chloroplast genome and ~15.8‐kbp linear mitochondrial genome were sequenced prior to the advent of high‐throughput sequencing technologies. Here, high coverage shotgun sequencing was used to assemble both organellar genomes de novo . These new genomes correct dozens of errors in the prior genome sequences and annotations. Genome sequencing coverage indicates that each cell contains on average 83 copies of the chloroplast genome and 130 copies of the mitochondrial genome. Using protocols and analyses optimized for organellar transcripts, RNA ‐Seq was used to quantify their relative abundances across 12 different growth conditions. Forty‐six percent of total cellular mRNA is attributable to high expression from a few dozen chloroplast genes. RNA ‐Seq data were used to guide gene annotation, to demonstrate polycistronic gene expression, and to quantify splicing of psaA and psbA introns. In contrast to a conclusion from a recent study, we found that chloroplast transcripts are not edited. Unexpectedly, cytosine‐rich polynucleotide tails were observed at the 3’‐end of all mitochondrial transcripts. A comparative genomics analysis of eight laboratory strains and 11 wild isolates of C. reinhardtii identified 2658 variants in the organellar genomes, which is 1/10th as much genetic diversity as is found in the nucleus.

Research Organization:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Institutes of Health (NIH)
Grant/Contract Number:
FC03-02ER63421; GM092473; DE‐FC03‐02ER63421
OSTI ID:
1922676
Alternate ID(s):
OSTI ID: 1416389
Journal Information:
The Plant Journal, Vol. 93, Issue 3; ISSN 0960-7412
Publisher:
Society for Experimental BiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 55 works
Citation information provided by
Web of Science

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