RNA was extracted from Zn-limited cells and at 1.5, 3, 4.5, 12, and 24 h after Zn resupply as described above. Two Zn-replete samples were collected as controls: in mid-logarithmic and in stationary phase.
Quadruplicate cDNA libraries from each time point were prepared using the
TruSeq Stranded mRNA Sample Prep Kit (Illumina) following the manufacturer’s instructions (Revision D). Sequencing was performed on a
HiSeq 2000 high throughput sequencer (Illumina) according to the manufacturer’s instructions. The libraries were loaded 8 per lane and sequenced for 50 nt. After demultiplexing, this yielded 2.5×10
7 reads on average per library. Quality scores were high, averaging between 33 and 40 over the length of the reads. The resulting reads were aligned to v5.3.1 of the
C. reinhardtii genome assembly
1 (link) available from the Joint Genome Institute at
www.phytozome.net. Alignments were performed using TopHat2
55 (link) with guidance from the Augustus 11.6 gene models (
www.phytozome.net). Expression was quantified and standardized in terms of fragments per kb of exon per million fragments (FPKMs) by Cufflinks, and differential expression testing was performed by Cuffdiff
56 (link).
We deposited the raw reads and expression estimates from the RNAseq experiment at the NCBI GEO database with the accession number GSE58786.
Hong-Hermesdorf A., Miethke M., Gallaher S.D., Kropat J., Dodani S.C., Chan J., Barupala D., Domaille D.W., Shirasaki D.I., Loo J.A., Weber P.K., Pett-Ridge J., Stemmler T.L., Chang C.J, & Merchant S.S. (2014). Sub-cellular metal imaging identifies dynamic sites of Cu accumulation in Chlamydomonas. Nature chemical biology, 10(12), 1034-1042.