Roche NimbleGen and Sigma-Aldrich
(Nasdaq:SIAL) have started a collaboration to further chromatin immunoprecipitation-on-microarray
(ChIP-chip) research by aligning their two complementary technologies, Roche
NimbleGen's ChIP-chip high-density microarrays and GenomePlex by Sigma-Aldrich.
Together, the platforms enable researchers to effectively study the entire genome
for epigenetic interactions between DNA and DNA-binding proteins to determine
regions of the genome that are transcriptionally active or repressed as well
as the mechanisms that regulate these processes. Understanding the fundamental
epigenomic and genomic regulatory pathways underlying normal cell growth and
tissue differentiation, as well as changes in regulatory control associated
with disease, is crucial for the development of drugs that target these pathways.
To facilitate the ChIP-chip workflow, Roche NimbleGen and Sigma-Aldrich will
publish protocols for ChIP-chip research and provide technical support to researchers
integrating the two technologies, as well as co-market their complementary products.
ChIP-chip is a powerful tool that combines chromatin immunoprecipitation (ChIP)
with microarrays to understand DNA-protein interactions. The ChIP step deploys
a specific antibody against a regulatory protein of interest, which results
in the enrichment of DNA fragments bound to the target protein. Usually these
enriched DNA fractions are at very low concentrations and need to be further
amplified for detection. The technologies from Sigma-Aldrich and Roche NimbleGen
facilitate effective ChIP-chip research by addressing two critical bottlenecks
in the workflow: efficient amplification of targeted sections of DNA and high-resolution
microarray detection. For researchers, GenomePlex is the preferred method to
amplify targeted small (less than 200bp) DNA fragments in an efficient and unbiased
manner. The amplified genome can then be analyzed on Roche NimbleGen's high
density (up to 2.1 million probes per array), long oligonucleotide, ChIP-chip
arrays, the most sensitive on the market, to examine the interactions between
DNA and proteins such as transcription factors, histones and polymerases.
"The Sigma-Aldrich whole genome amplification technology is our method
of choice for preparing ChIP samples for microarray analysis. The high reproducibility
and effectiveness of GenomePlex for amplifying ChIP samples from a small number
of cells, in combination with the outstanding sensitivity of the Roche NimbleGen
high density microarrays, allows us to study chromatin patterns in small amounts
of normal and cancer tissues," said Dr. Peggy Farnham, Professor of Pharmacology
and Associate Director of Genomics at the University of California Davis.
Whole genome amplification provides advantages over other techniques researchers
have relied on in the past. For example, ligation-mediated PCR, a commonly used
technique for preparing DNA for ChIP analysis, often causes investigators to
miss important binding sites. With the whole genome effectively amplified by
GenomePlex, analysis on Roche NimbleGen high-density arrays can reveal rare
protein-DNA interactions with a high signal to noise ratio and sensitivity.
For more information on the technologies, please visit Sigma-Aldrich at www.sigma-aldrich.com/wga
or Roche NimbleGen at www.nimblegen.com/products/chip.
Sigma-Aldrich is a leading Life Science and High Technology company. Its biochemical
and organic chemical products and kits are used in scientific research, including
genomic and proteomic research, biotechnology, pharmaceutical development and
as key components in pharmaceutical, diagnostic and other high technology manufacturing.
The Company has customers in life science companies, university and government
institutions, hospitals, and in industry. Over one million scientists and technologists
use its products. Sigma-Aldrich operates in 37 countries and has 7,900 employees
providing excellent service worldwide. Sigma-Aldrich is committed to Accelerating
Customer Success through Innovation and Leadership in Life Science, High Technology
and Service. For more information about Sigma-Aldrich, please visit its award-winning
Web site at http://www.sigma-aldrich.com.
Roche NimbleGen is a leading innovator, manufacturer, and supplier of a proprietary
suite of DNA microarrays, consumables, instruments and services. Roche NimbleGen
produces high-density arrays of long oligonucleotide probes that provide greater
information content and higher data quality necessary for studying the full
diversity of genomic and epigenomic variation. The enhanced performance is made
possible by Roche NimbleGen's proprietary Maskless Array Synthesis (MAS) technology,
which uses digital light processing and rapid, high-yield photochemistry to
synthesize long oligonucleotide, high-density DNA microarrays with extreme flexibility.
For more information about Roche NimbleGen, please visit the company's website