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Sample GSM2837189 Query DataSets for GSM2837189
Status Public on Jul 29, 2019
Title SubAcute_2_serum
Sample type SRA
Source name serum
Organism Equus caballus
Characteristics tissue: serum
disease: subacute placentitis
region: n/a
Extracted molecule total RNA
Extraction protocol Isolation of RNA from tissue was performed using RNeasy Mini Kit (Qiagen, Gaithersburg, MD, USA), per manufacturer’s instructions. After extraction, RNA was analyzed by NanoDrop® (Thermo Fisher Scientific) and Bioanalyzer® (Agilent, Santa Clara, CA, USA) to evaluate concentration, purity and integrity. All samples had a 230/260 ratio > 1.8, a 260/280 ratio > 2.0 and an RNA integrity number > 8.0. Serum RNA was isolated using miRNeasy Micro Kit (Qiagen) per the manufacturer’s instructions for cell culture, with chloroform increased to 300 mL and the optional RWT wash included. Bioanalyzer® analysis was performed to ensure there was no cellular RNA contamination.
Library preparation was performed using a modified small RNA sequencing library construction protocol 72. In brief, the in-house protocol used adapters with four degenerate bases at each ligation site. Modified adapter sequences are based on Illumina adapter sequences and are listed in Supplementary Table 6. The adapters were purchased from Integrated DNA Technologies (Coralville, IA, USA). The 3’ adapter ligation reaction includes 5 ml of RNA, 1 ml of 3’ adapter at 10 nM, 1 ml of RNase inhibitor (Thermo Fisher Scientific), 1 ml of modified T4 RNA Ligase 2 (NEB, Ipswich, MA, USA) and 1 ml of 10 X ligase buffer. The ligation was performed for 1 hour at 25oC, and was facilitated by the addition of 15% PEG 8000. Before adding the 5’ adapter, 1 µL of single-strand binding protein (1µg/µl) (Promega, Madison, WI, USA), 1 uL of 5’-deadenylase (NEB) and 1uL of RecJ (NEB) were added, mixed and incubated at 37oC for 1 hour to remove adapter dimers. For 5’ adapter ligation, 1 µl of 5’ adapter at 25 µM, 1 µL of T4 RNA Ligase (NEB, Ipswich MA), and 1 µL of 10 mM ATP were added then incubated for 1 hour at 25 oC. Complementary DNA (cDNA) was generated from ligated product with SuperScript III reverse transcriptase (Thermo Fisher Scientific) using primer complimentary to the 3’ adapter sequence. The resulting cDNA was amplified with Illumina universal primer and indexed-primer. Library size-selection was performed using a PippinHT instrument (Sage Science, Boston, MA, USA) with either a 3% agarose cassette or with 6% polyacrylamide gel. The library with proper insert size was sequenced with the NextSeq 500 (Illumina, San Diego, CA).
Library strategy miRNA-Seq
Library source transcriptomic
Library selection size fractionation
Instrument model Illumina NextSeq 500
Data processing The sequencing results were analyzed using an in-house small RNA analysis program - sRNAanalyzer ( The adaptor sequences were trimmed and low-quality sequences such as low nucleotide complexity reads, homopolymer sequences or di-, tri-nucleotide repeat sequences were removed before the reads were mapped against various databases.
The processed reads were then sequentially mapped against databases including Equus caballus miRNA (mirBase; 74), novel Equus caballus miRNA not yet incorporated in mirBase (horse_novel, 75), transcripts, virus, plant and all miRNA (mirBase), coding transcripts (RefSeq), ribosomal and transfer RNA, equine non-coding RNA, equine coding transcripts (CDS) and equine genomic sequence (DNA)
Genome_build: EquCab 2.0
Supplementary_files_format_and_content: .xls - raw read counts
Submission date Nov 01, 2017
Last update date Jul 29, 2019
Contact name Shavahn C Loux
Organization name University of Kentucky
Department Veterinary Science
Street address 1400 Nicholasville
City Lexington
State/province KY
ZIP/Postal code 40546
Country USA
Platform ID GPL21401
Series (1)
GSE106398 Small RNA Expression in the Chorioallantois, Endometrium and Serum of Mares Following Experimental Induction of Placentitis
BioSample SAMN07964409
SRA SRX3350107

Supplementary data files not provided
SRA Run SelectorHelp
Raw data are available in SRA
Processed data are available on Series record

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