We find that mtDNA mutations are almost exclusively the product of a mutational process that is specific to mitochondria and probably linked to the unique mechanism of genome replication these organelles employ.
This is in stark contrast to the mutational spectrum in probably all other dumpy exons where the mutations are almost exclusively deletions or nonsense mutations.
He soon reported back: Goldstein's hypothesis — that Bertrand suffered from a new glycosylation disorder caused by NGLY1 mutations — was almost certainly correct.
Direct measures of fitness from site-directed mutagenesis studies tell a similar story: the fitness effects of synonymous mutations are almost always deleterious or, more rarely, weakly beneficial3,8,9,10,11.
In the present study, we demonstrated that KRAS, NRAS, and BRAF mutations were almost exclusively found in UM IGHV/trisomy 12 CLL and were almost mutually exclusive with NOTCH1 and BIRC3 mutations.
For example, while disadvantageous mutations are usually eliminated quickly in large populations, new advantageous mutations are almost as vulnerable to loss through genetic drift as are neutral mutations.
Still the frequency of mutations was almost the same.
For several autosomal dominant disorders such as achondroplasia, the Apert and Waardenburg syndrome [12], [13], the mutations are almost exclusively of paternal origin.
However, in case of Leber's hereditary optic neuropathy (LHON) and non-syndromic sensoneural hearing loss, the mutations are almost homoplasmic and only a few cases of heteroplasmy have been observed [8] [10].
