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| Status |
Public on Dec 20, 2013 |
| Title |
Young |
| Sample type |
SRA |
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| Source name |
skin_young
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| Organism |
Homo sapiens |
| Characteristics |
subjects: 10 healthy female volunteers
age of subjects: about 25 years
tissue: skin (epidermal suction blister samples)
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| Extracted molecule |
genomic DNA |
| Extraction protocol |
Epidermal suction blister samples were collected according to the current version of the Declaration of Helsinki and the guideline of the International Conference on Harmonization Good Clinical Practice (ICH GCP) was observed as applicable to a non-drug study. All volunteers provided written, informed consent. Suction blister samples were obtained at the study center of Beiersdorf AG and approved by the Beiersdorf AG Legal Review Board. Briefly, epidermis samples were detached from the forearms of 10 healthy female volunteers by applying a negative pressure of 150–250 mmHg for 2 h. Subsequently, suction blister roofs were taken and immediately stored at -20 °C. For nucleic acid isolation, suction blister samples were washed in DPBS (Cambrex) and homogenized using a TissueLyser (Retsch). DNA from suction blister samples was isolated using the QIAamp DNA Investigator Kit (Qiagen) and Fibrous Tissue Kit (Qiagen), respectively, according to the manufacturer’s instructions.
5 µg of high molecular weight DNA were used for fragmentation using the Covaris S2 AFA System in a total volume of 100 µl. Fragmentation-run parameters: Duty cycle 10%; Intensity: 5; Cycles/burst: 200; Time: 3 min; number of cycles: 3, resulting in a total fragmentation-time of 180 s. Fragmentation was confirmed with a 2100 Bioanalyzer (Agilent Technologies) using a DNA1000 chip. The fragmented DNAs were concentrated to a final volume of 75 µl using a DNA Speed Vac. End repair of fragmented DNA was carried out in a total volume of 100 µl using the Paired End DNA Sample Prep Kit (Illumina) as recommended by the manufacturer. For the ligation of the adaptors, the Illumina Early Access Methylation Adaptor Oligo Kit and the Paired End DNA Sample Prep Kit (Illumina) were used, as recommended by the manufacturer. For the size selection of the adaptor-ligated fragments, we used the E-Gel Electrophoresis System (Invitrogen) and a Size Select 2% precast agarose gel (Invitrogen). Each fragmented DNA was loaded on two lanes of the E-gel. Electrophoresis was carried out using the “Size Select” program for 16 min. According to the standard loaded (50 bp DNA Ladder, Invitrogen), 240 bp fragments were extracted from the gel, pooled, and directly transferred to bisulfite treatment without further purification. For the bisulfite treatment we used the EZ-DNA Methylation Kit (Zymo) as recommended by the manufacturer with the exception of a modified thermal profile for the bisulfite conversion reaction. The conversion was carried out in a thermal cycler using the following thermal profile: 95°C for 15 s, 50°C for 1 h, repeat from step 1, 15×, 4°C for at least 10 min. The libraries were subsequently amplified, using the Fast Start High Fidelity PCR System (Roche) with buffer 2, and Illuminas PE1.1 and PE2.1 amplification primers. PCR thermal profile: 95°C for 2 min, 95°C for 30 s, 65°C for 20 s, 72°C for 30 s, then repeat from step 2, 11×, 72°C for 7min, hold at 4°C. PCR reactions were purified on PCR purification columns (MinElute, Qiagen) and eluted in 20 µl elution buffer (Qiagen).
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| Library strategy |
Bisulfite-Seq |
| Library source |
genomic |
| Library selection |
RANDOM |
| Instrument model |
Illumina HiSeq 2000 |
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| Description |
Sample 1
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| Data processing |
Illumina Casava1.8.1 software used for basecalling.
Preprocessing, read trimming: shore 0.6.2
Preprocessing, quality filtering: shore 0.6.2
BS-mapping: bsmap 2.0
computation of methylation ratios: methratio.py (part of bsmap package)
Genome_build: hg19
Supplementary_files_format_and_content: Bedgraph-format containing the genomic methylation ratios of the respective sample
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| Submission date |
Apr 29, 2013 |
| Last update date |
May 15, 2019 |
| Contact name |
Guenter Raddatz |
| Organization name |
German Center for Cancer Research
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| Street address |
Im Neuenheimer Feld 580
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| City |
Heidelberg |
| ZIP/Postal code |
69120 |
| Country |
Germany |
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| Platform ID |
GPL11154 |
| Series (2) |
| GSE46450 |
Age-related methylation changes are associated with altered transcriptional circuitry [Methyl-seq] |
| GSE46487 |
Age-related methylation changes are associated with altered transcriptional circuitry |
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| Relations |
| BioSample |
SAMN02086217 |
| SRA |
SRX272414 |
| Supplementary file |
Size |
Download |
File type/resource |
| GSM1130490_young_ratio.bedgraph.gz |
308.8 Mb |
(ftp)(http) |
BEDGRAPH |
SRA Run Selector |
| Raw data are available in SRA |
| Processed data provided as supplementary file |
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