title: Global array-based transcriptomics from minimal input RNA utilising an optimal RNA isolation process combined with SPIA cDNA probes.
abstract: Technical advances in the collection of clinical material, such as laser capture microdissection and cell sorting, provide the advantage of yielding more refined and homogenous populations of cells. However, these attractive advantages are counter balanced by the significant difficulty in obtaining adequate nucleic acid yields to allow transcriptomic analyses. Established technologies are available to carry out global transcriptomics using nanograms of input RNA, however, many clinical samples of low cell content would be expected to yield RNA within the picogram range. To fully exploit these clinical samples the challenge of isolating adequate RNA yield directly and generating sufficient microarray probes for global transcriptional profiling from this low level RNA input has been addressed in the current report. We have established an optimised RNA isolation workflow specifically designed to yield maximal RNA from minimal cell numbers. This procedure obtained RNA yield sufficient for carrying out global transcriptional profiling from vascular endothelial cell biopsies, clinical material not previously amenable to global transcriptomic approaches. In addition, by assessing the performance of two linear isothermal probe generation methods at decreasing input levels of good quality RNA we demonstrated robust detection of a class of low abundance transcripts (GPCRs) at input levels within the picogram range, a lower level of RNA input (50 pg) than previously reported for global transcriptional profiling and report the ability to interrogate the transcriptome from only 10 pg of input RNA. By exploiting an optimal RNA isolation workflow specifically for samples of low cell content, and linear isothermal RNA amplification methods for low level RNA input we were able to perform global transcriptomics on valuable and potentially informative clinically derived vascular endothelial biopsies here for the first time. These workflows provide the ability to robustly exploit ever more common clinical samples yielding extremely low cell numbers and RNA yields for global transcriptomics.
authors: Translational Medicine Research Collaboration, TMRC Laboratory, Ninewells Hospital, Dundee, United Kingdom.
authors: Laura
authors: L
authors: Kennedy
authors: Mahesh
authors: M
authors: Pauriah
authors: Valerie
authors: V
authors: Godfrey
authors: Jacqueline
authors: J
authors: Howie
authors: Helen
authors: H
authors: Dennis
authors: Daniel
authors: D
authors: Crowther
authors: Allan
authors: A
authors: Struthers
authors: Catharine
authors: C
authors: Goddard
authors: Giora
authors: G
authors: Feuerstein
authors: Chim
authors: C
authors: Lang
authors: Gino
authors: G
authors: Miele
mesh_terms: D001706:Biopsy; D015342:DNA Probes; D018076:DNA, Complementary / Q000235:genetics*; D004730:Endothelium, Vascular / Q000166:cytology / Q000378:metabolism; D020869:Gene Expression Profiling; D006801:Humans; D020411:Oligonucleotide Array Sequence Analysis; D016133:Polymerase Chain Reaction; D012313:RNA / Q000235:genetics*; D043562:Receptors, G-Protein-Coupled / Q000235:genetics
chemical_list: D015342:DNA Probes; D018076:DNA, Complementary; D043562:Receptors, G-Protein-Coupled; D012313:RNA