Animal cellulases

@article{Watanabe2001AnimalC,
  title={Animal cellulases},
  author={H. Watanabe and Gaku Tokuda},
  journal={Cellular and Molecular Life Sciences CMLS},
  year={2001},
  volume={58},
  pages={1167-1178}
}
Abstract. Previous dogma has maintained that cellulose, ingested by xylophagous or herbivorous animals, is digested by cellulolytic symbiotes. The first evidence in conflict with this contention involved the demonstration of cellulolytic activities in symbiote-free secreting organs (e.g., the salivary glands of termites) or defaunated guts. Following these demonstrations, possible endogenous cellulase components were purified from several cellulose-digesting invertebrates, but this research did… 
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It is demonstrated that the degradation of xylan, the major component of hemicellulose, is restricted to the hindgut compartment, where it is preferentially hydrolyzed over cellulose.
Prospecting for cellulolytic activity in insect digestive fluids.
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The data suggests that a phylogenetic relationship may exist for the origin of cellulolytic enzymes in insects, and that cellulase activity levels correlate with taxonomic classification, probably reflecting differences in plant host or feeding strategies.
Evidence for the presence of a cellulase gene in the last common ancestor of bilaterian animals
TLDR
The results suggest that at least one family of endogenous cellulases may be more widespread in animals than previously thought and questions the idea of lateral gene transfer into the ancestors of the latter.
Cellulose digestion by common Japanese freshwater clam Corbicula japonica
TLDR
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Evaluation of cellulolytic activity in insect digestive fluids.
TLDR
The data indicate that the origin of cellulolytic enzymes probably reflects the phylogenetic relationship and feeding strategies of different insects, except for individual Lepidoptera species.
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