title: Amplification of GC-rich Putative Mouse PeP Promoter using Betaine and DMSO in Ammonium Sulfate Polymerase Chain Reaction Buffer.
abstract: BACKGROUND
  Recently, we have shown that peroxisomal protein expression was induced upon retinoic acid treatment in mouse embryonic stem cells during the process of neurogenesis. Thus, characterization of the respective promoter could elucidate the molecular aspects of transcriptional regulation of this gene.
  
  
  METHODS
  Using the conventional software programs for promoter prediction, a putative promoter region was identified approximately 561 bp upstream of the peroxisomal protein coding sequence. In order to clone this region with a GC-content of 71.01%, a cocktail of ammonium sulfate buffer supplied with two additive components, betaine and dimethyl sulfoxide, and a high concentration of MgCl(2) was used.
  
  
  RESULTS
  The modulated polymerase chain reaction composition significantly improved the amplification of GC-rich DNA target sequences. Improved amplification of this region was due to reduction in the formation of secondary structures by the GC-rich region.
  
  
  CONCLUSIONS
  Therefore, this polymerase chain reaction composition could be generally used to facilitate the amplification of other GC-rich DNA sequences as verified by amplification of different GC rich regions.
authors: Department of Biology, School of Sciences, University of Isfahan, Isfahan, Iran.
authors: Tahere
authors: T
authors: Seifi
authors: Kamran
authors: K
authors: Ghaedi
authors: Ahmad
authors: A
authors: Salamian
authors: Sommayeh
authors: S
authors: Tanhaei
authors: Forouzan
authors: F
authors: Safari
authors: Zohreh
authors: Z
authors: Hojati
authors: Manuchehr
authors: M
authors: Tavassoli
authors: Hossein
authors: H
authors: Baharvand
authors: Mohammad-Hossein Nasr
authors: MH
authors: Esfahani
keywords: Amplification; GC-rich region; Peroxsiomal protein; Promoter