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John M. S. Bartlett.pdf - Bio-Nica.info

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Serial Analysis of Gene Expression 273<br />

Table 1<br />

Useful Web Sites for SAGE<br />

URL<br />

Contents<br />

http://www.sagenet.org/sage_protocol.htm <strong>John</strong>s Hopkins SAGE protocol and software<br />

for non-commercial use, plus conferences,<br />

publications and other <strong>info</strong>rmation (1,2)<br />

http://www.genzyme.com/sage/<br />

Genzyme Molecular Oncology: <strong>info</strong>rmation<br />

on SAGE and its commercial use<br />

http://www.invitrogen.com<br />

Invitrogen including I-SAGE protocol<br />

http://www.dsv.cea.fr/thema/get/<br />

SADE: a SAGE Adaptation for Downsized<br />

sade.html Extracts (6)<br />

http://www.ambion.com<br />

Ambion website with advice on RNA work<br />

http://www.ncbi.nlm.nih.gov/SAGE/ NCBI’s SAGEmap (20)<br />

http://www.ncbi.nlm.nih.gov/UniGene/<br />

NCBI’s UniGene (“unique gene”: clusters all<br />

index.html transcripts of one gene under one name) (19)<br />

http://www.geneontology.org<br />

Gene Ontology databases: <strong>info</strong>rmation on<br />

gene function and cellular location (25)<br />

comparisons and for investigation of the expression of individual transcripts, which can<br />

be further studied via Unigene (see Table 1, ref. 19). The statistical basis for designing<br />

and analyzing SAGE experiments has also been discussed in detail (21–24). Here,<br />

however, the focus is on the wet laboratory work.<br />

2. Materials<br />

The reagents specified have been used successfully, but many equivalents are<br />

available and could be used if preferred (see Note 1). This description is based on<br />

the <strong>John</strong>s Hopkins protocol (version 1.0d); the most helpful modifications are also<br />

described.<br />

2.1. RNA Work (see Note 2)<br />

1. Aerosol-resistant pipet tips (Greiner Labortechnik Ltd, Gloucestershire, UK).<br />

2. DEPC-treated water (Diethylpyrocarbonate: Sigma, Dorset, UK).<br />

3. (Optional) RnaseZap ® (Ambion (Europe) Ltd, Cambridgeshire, UK).<br />

2.2. Kits for Purification of RNA and cDNA Synthesis<br />

1. Preparation of total RNA: TRIZOL ® Reagent (Invitrogen Life Technologies, Paisley, UK).<br />

2. Purification of polyA+ mRNA: Poly(A)Purist Kit (Ambion).<br />

3. (Alternative protocols: streptavidin-coated tubes obtained with mRNA Capture Kit or<br />

separately (Roche Diagnostics Ltd, East Sussex, UK), instead of steps 1 and 2 (see Note 3<br />

and Subheadings 2.4. and 2.6.).<br />

4. cDNA synthesis: SUPERSCRIPT Choice System for cDNA Synthesis (Invitrogen).<br />

2.3. Purification of DNA<br />

1. Phenolchloroform (P/C): phenolchloroformisoamyl alcohol (25241; Ambion).<br />

2. Glycogen, molecular biology grade (20 mg/mL) (Roche Diagnostics Ltd).<br />

3. Ammonium acetate (10 M).

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