User:Torsten Waldminghaus/Notebook/Methylation array: Difference between revisions
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**synchronized cells | **synchronized cells | ||
**does introduction of a GATC cluster alter methylation of surrounding sites? | **does introduction of a GATC cluster alter methylation of surrounding sites? | ||
*As independent method and first step one could analyse cutting by methylation sensitive REN with qPCR | *As independent method and first step one could analyse cutting by methylation sensitive REN with qPCR | ||
**on whole chromosome | **on whole chromosome | ||
**clusters and isolated GATCs | **clusters and isolated GATCs | ||
**coding regions and intergenic regions | **coding regions and intergenic regions | ||
Possible restriction enzymes that are Dam methylation sensitive: | |||
{| border="3" | |||
! Enzyme!! Site !! Notes !! Link | |||
|- | |||
| HphI || GGTGA || No star activity; reaction at 37°C; heatinactivation at 20 min 65°C||http://www.fermentas.com/catalog/re/hphi.htm | |||
|- | |||
|MboII || GAAGA || Star activity; reaction at 37°C; heatinactivation at 20 min 65°C||http://www.fermentas.com/catalog/re/mboii.htm | |||
|- | |||
|TaqI || TCGA ||No star activity; reaction at 65 °C; no heatinactivation after 20 min 80°C ||http://www.fermentas.com/catalog/re/taqi.htm | |||
|} | |||
*'''HphI''' seems to be a goog choice since it can be heatinactivated and has no star activity (does not cleave unspecific when DNA is overdigested). | |||
<biblio> | <biblio> |
Revision as of 02:21, 26 May 2008
Idea
- Analyse the methylation of GATC sites genomewide in E. coli.
Notes
- Løbner-Olesen et al, 2003 [1] used a aroK17::cat strain to have more hemimethylation in the cell, since a polar effect on dam leads to a reduced Dam content in the cell (only 30% of wt [2]). Could be used as control and for interesting analysis.
- methylation in different strains could be interesting:
- dam-overproduction
- seqA deletion, over-production, under-production
- synchronized cells
- does introduction of a GATC cluster alter methylation of surrounding sites?
- As independent method and first step one could analyse cutting by methylation sensitive REN with qPCR
- on whole chromosome
- clusters and isolated GATCs
- coding regions and intergenic regions
Possible restriction enzymes that are Dam methylation sensitive:
Enzyme | Site | Notes | Link |
---|---|---|---|
HphI | GGTGA | No star activity; reaction at 37°C; heatinactivation at 20 min 65°C | http://www.fermentas.com/catalog/re/hphi.htm |
MboII | GAAGA | Star activity; reaction at 37°C; heatinactivation at 20 min 65°C | http://www.fermentas.com/catalog/re/mboii.htm |
TaqI | TCGA | No star activity; reaction at 65 °C; no heatinactivation after 20 min 80°C | http://www.fermentas.com/catalog/re/taqi.htm |
- HphI seems to be a goog choice since it can be heatinactivated and has no star activity (does not cleave unspecific when DNA is overdigested).
- Løbner-Olesen A, Marinus MG, and Hansen FG. Role of SeqA and Dam in Escherichia coli gene expression: a global/microarray analysis. Proc Natl Acad Sci U S A. 2003 Apr 15;100(8):4672-7. DOI:10.1073/pnas.0538053100 |
- Løbner-Olesen A, Boye E, and Marinus MG. Expression of the Escherichia coli dam gene. Mol Microbiol. 1992 Jul;6(13):1841-51. DOI:10.1111/j.1365-2958.1992.tb01356.x |
- Braun RE and Wright A. DNA methylation differentially enhances the expression of one of the two E. coli dnaA promoters in vivo and in vitro. Mol Gen Genet. 1986 Feb;202(2):246-50. DOI:10.1007/BF00331644 |
- Kücherer C, Lother H, Kölling R, Schauzu MA, and Messer W. Regulation of transcription of the chromosomal dnaA gene of Escherichia coli. Mol Gen Genet. 1986 Oct;205(1):115-21. DOI:10.1007/BF02428040 |
- Campbell JL and Kleckner N. E. coli oriC and the dnaA gene promoter are sequestered from dam methyltransferase following the passage of the chromosomal replication fork. Cell. 1990 Sep 7;62(5):967-79. DOI:10.1016/0092-8674(90)90271-f |
- Pfister S, Schlaeger C, Mendrzyk F, Wittmann A, Benner A, Kulozik A, Scheurlen W, Radlwimmer B, and Lichter P. Array-based profiling of reference-independent methylation status (aPRIMES) identifies frequent promoter methylation and consecutive downregulation of ZIC2 in pediatric medulloblastoma. Nucleic Acids Res. 2007;35(7):e51. DOI:10.1093/nar/gkm094 |