With regard to FOXP2 and speech and language disorders, it has been hypothesized that etiological mutations in this gene affect corticostriatal and corticocerebellar networks that facilitate the learning and production of rapid movement sequences [4] and that might also be important for aspects of language function [33].
Actually, each etiological mtDNA mutation has its own heteroplasmy threshold that needs to be measured.
Fujimoto et al. sequenced the entire genome of liver cancers to identify etiological influences on mutation patterns.
Hence, it is necessary to seek various etiological factors, including genetic mutations that may be of importance in triggering recurrence and progression of acute to chronic pancreatitis.
The study's premise is that any important genetic factors (e.g. ATM gene mutations) and etiological factors for breast cancer (e.g. radiation exposure) will be more prevalent among women who already have a first primary cancer than they would be among women in the general population.
Exclusion of the "hot-spot" mutations did not markedly alter the observed relationships, indicating that a putative selective growth advantage does not cover up the etiological basis for the observed mutation spectrum.
The apparent reliance on single-dose nasal instillation studies (e.g., Hester et al., 2003, 2005) that report effects on DNA repair genes as the basis for presuming that early mutations play an etiological role in nasal tumorigenesis ignores the fact that the single formaldehyde dose by instillation up-regulated 3 times more genes that an inhalation dose of 15ppm (Andersen et al., 2008).
Consequently, for formaldehyde-induced nasal tumors in rats, it seems reasonable to also assume that if early mutations play an etiological role in the process, DNA repair and associated genes in nasal tissues would be activated at all exposure doses, but this has not been reported.
We identified the p.G2019S in one AD patient with no PD signs, indicating that this mutation is not a common etiological factor for AD in our population (0.5%), corroborating recent data found in Norwegian, North American, Chinese and Italian populations.
First, in discussing the MOA for formaldehyde-induced nasal tumors, the US EPA/IRIS (2010a) assessment takes the position that mutations play a necessary early etiological role in nasal tumorigenesis, which is consistent with a presumption that a linear, no-threshold model must be used to assess potential risks.
