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Is junk DNA bunk? A critique of ENCODE

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Doolittle, W. Ford·2013·Proceedings of the National Academy of Sciences

Abstract

Do data from the Encyclopedia Of DNA Elements (ENCODE) project render the notion of junk DNA obsolete? Here, I review older arguments for junk grounded in the C-value paradox and propose a thought experiment to challenge ENCODE’s ontology. Specifically, what would we expect for the number of functional elements (as ENCODE defines them) in genomes much larger than our own genome? If the number were to stay more or less constant, it would seem sensible to consider the rest of the DNA of larger genomes to be junk or, at least, assign it a different sort of role (structural rather than informational). If, however, the number of functional elements were to rise significantly with C-value then, ( i ) organisms with genomes larger than our genome are more complex phenotypically than we are, ( ii ) ENCODE’s definition of functional element identifies many sites that would not be considered functional or phenotype-determining by standard uses in biology, or ( iii ) the same phenotypic functions are often determined in a more diffuse fashion in larger-genomed organisms. Good cases can be made for propositions ii and iii . A larger theoretical framework, embracing informational and structural roles for DNA, neutral as well as adaptive causes of complexity, and selection as a multilevel phenomenon, is needed.

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Metadata

Authors
Doolittle, W. F.
Venue
Proceedings of the National Academy of Sciences
Published
2013-03-11
Volume
110
Issue
14
Pages
5294-5300
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2148964874
Cited by
429
References
54
FWCI
61.34
Type
journal article
Language
en
Open access
green

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Doolittle, W. F. (2013). Is junk DNA bunk? A critique of ENCODE. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1221376110

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