In summary, the discordance between the short half-lives of this major class of modified biomolecules implicated in memory formation and memory duration is extreme.
In summary, the role of the Gadd family of repair proteins in the turnover of DNA methylation and memory duration remains an important problem worthy of further study, in spite of the apparent complexity of various published reports.
The duration that the immunologic response to Leishmania antigen remains after therapy may be an indicator of memory duration after infection with Leishmania and this information will be relevant in vaccine development for leishmaniasis.
Crick's model highlighting the importance of molecular turnover and the role of molecular symmetry to memory duration appears to have been way ahead of its time and is worthy of serious consideration as we explore the molecular bases of memory.
Crick's model highlighting the importance of rapid molecular turnover and molecular symmetry to memory duration has, with few exceptions, been overlooked in the literature [ 3, 9, 10].
Consequently, stimuli with a physical duration equal to the reference memory duration are perceived as longer when they are auditory and as shorter when they are visual (Penney et al., 2000).
In contrast, the effect of spatial memory duration was mediated by the level of prey spatial aggregation.
But these results only increase the concern for Crick's paradox, because more rapid TET-dependent turnover works against 5MeC-dependent memory duration.
In particular, for 2-D pixel noise patterns, discrimination thresholds increased as the memory duration increased from 0.3 to 5 s.
The machinery responsible for the predominant DNA 5MeC de-methylation activities contributing to turnover has been difficult to pin down in any tissue, let alone de-methylation in the brain, which might impact memory duration [ 21].
