PubMed · 13808388
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D G CATCHESIDE. 1959-10-03. Cytoplasmic inheritance.. https://doi.org/10.1038/1841012a0
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Recent work suggests that two unrelated phenotypes, [PSI+] and [URE3], in the yeast Saccharomyces cerevisiae are transmitted by non-covalent changes in the physical states of their protein determinants, Sup35p and Ure2p, rather than by changes in the genes that encode these proteins. The mechanism by which alternative protein states are self-propagating is the key to understanding how proteins function as elements of epigenetic inheritance. Here, we focus on recent molecular-genetic analysis of the inheritance of the [PSI+] factor of S. cerevisiae. Insights into this process might be extendable to a group of mammalian diseases (the amyloidoses), which are also believed to be a manifestation of self-perpetuating changes in protein conformation.
Neonatal nurses need to understand the basic patterns of genetic transmission. This article, the first in a series, provides an overview of Mendel's laws and discusses five types of transmission: single gene inheritance, chromosomal inheritance, multifactorial inheritance, cytoplasmic inheritance, and somatic cell mutations.