We have used a conditional null mutant mouse model in a proteomics approach to identify proteins with modified expression levels after 4 Gy ionizing irradiation in the absence of nibrin in vivo.
The data showing that several of these synaptic proteins have modified expression levels pre/early-symptomatically in NCL mice suggests that synaptic changes at the molecular level are instigated in advance of any overt neuropathological changes.
Perhaps the most exciting finding of the present study is that modified expression levels of two distinct proteins (VDAC1 and Pttg1) robustly occur during the pre/early-symptomatic stages of disease progression in both mouse models of NCL examined.
The finding that several cell-cycle-related proteins have modified expression levels provides evidence that the cell-cycle status of terminally differentiated neurons and/or their supporting cells is altered in the NCLs.
Both VDAC1 and Pttg1 showed significantly modified expression levels in hind-limb muscle preparations (including quadriceps, hamstrings, gastrocnemius and soleus) from Ppt1 −/− mice compared with wild-type littermate controls (Fig. 8B and C).
Our finding that several proteins whose expression profiles are known to reflect the vulnerability status of axons and synapses have modified expression levels in the brains of two NCL mouse models provides further evidence in support of synaptic and axonal vulnerability in these disorders.
In other words, it contains all the time intervals during which the (modified) expression level is below t.
Of the >14,500 unique tags identified in both libraries, 224 had a modified expression level; they are known to participate in inflammation, ion transport, signal transduction, oxidative stress, apoptosis, metabolism, and catabolism.
Epigenetics is the study of small, usually heritable, molecular modifications – or 'tags'- that bind DNA and modify gene expression levels.
The single and multiple SNP constructs were shown to modify luciferase expression levels.
