High-amylose wheat generated by RNA interference improves indices of large-bowel health in rats.

Proc Natl Acad Sci U S A

Commonwealth Scientific and Industrial Research Organization, Food Futures National Research Flagship, P.O. Box 93, North Ryde 1670, NSW, Australia.

Published: March 2006

AI Article Synopsis

  • Foods rich in resistant starch can enhance human health and reduce the risk of chronic diseases.
  • RNA interference was used to reduce two types of starch-branching enzymes (SBEIIa and SBEIIb) in wheat to increase amylose levels.
  • Feed trials with rats showed that wheat with over 70% amylose improved large bowel function, indicating its potential health benefits.

Article Abstract

Foods high in resistant starch have the potential to improve human health and lower the risk of serious noninfectious diseases. RNA interference was used to down-regulate the two different isoforms of starch-branching enzyme (SBE) II (SBEIIa and SBEIIb) in wheat endosperm to raise its amylose content. Suppression of SBEIIb expression alone had no effect on amylose content; however, suppression of both SBEIIa and SBEIIb expression resulted in starch containing >70% amylose. When the >70% amylose wheat grain was fed to rats in a diet as a wholemeal, several indices of large-bowel function, including short-chain fatty acids, were improved relative to standard wholemeal wheat. These results indicate that this high-amylose wheat has a significant potential to improve human health through its resistant starch content.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1450120PMC
http://dx.doi.org/10.1073/pnas.0510737103DOI Listing

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