Structural inheritance

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Structural inheritance is  the transmission of a trait in a living organism by a self-perpetuating spatial structures. This is  in contrast to the transmission of digital information such as is  found in DNA sequences, which accounts for the vast majority of known genetic variation.

Examples of structural inheritance include the propagation of prions, the infections agents of diseases such as scrapie (in sheep and  goats), bovine spongiform encephalopathy ('mad cow disease') and  Cruetzfeld-Jakob disease (although the protein-only hypothesis of prion transmission has been considered contentious until quite recently ^[1]). Prion-like propagating secondary structures also exist in yeast ^[2] ,^[3]. Structural inheritance has also been seen in the orientation of [[cilium|cilia in protozoans such as Paramecium^[4] and  Tetrahymena, and  'handedness' of the sprial of the cell in Tetrahymena, and  shells of snails. Some organelles also have  structural inheritance, such as the centriole, and  the cell itself (defined by the plasma membrane) may also be an  example of structural inheritance.

Various additional examples of structural inheritance are  presented in the recent book Origination of Organismal Form.

[edit] External link

• Proceedings of the National Academy of Sciences supplement: Self-Perpetuating Structural States in Biology, Disease, and  Genetics

This genetics article is  a stub. You can  or  fix a stub">help Wikipedia by expanding it.

[ and  references">edit] Notes and  references

1. ^ Soto C, Castilla J. The controversial protein-only hypothesis of prion propagation. Nat Med. 2004 Jul;10 Suppl:S63-7.
2. ^ Tuite MF, Lindquist SL. Maintenance and  inheritance of yeast prions. Trends Genet. 1996 Nov;12(11):467-71.
3. ^ Serio TR, Cashikar AG, Kowal AS, Sawicki GJ, Lindquist SL. Self-perpetuating changes in Sup35 protein conformation as a mechanism of heredity in yeast. Biochem Soc Symp. 2001;(68):35-43.
4. ^ BEISSON, J. & SONNEBORN, T. M. (1965). Cytoplasmic inheritance of the organization of the cell cortex of Paramecium aurelia. Proc. natn. Acad Sci. U.S.A. 53, 275-282

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Categories: Genetics stubs | Epigenetics

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