We found 4 cases demonstrating loss of a single HLA-A or B allele (alterations not identified through immunohistochemistry), and 4 cases demonstrating loss of expression of both the A and B alleles, but not loss of all HLA class I molecules.
a Presence of penA mosaic allele or alteration of amino acid A501 in the penicillin-binding protein 2, which both have been associated with decreased susceptibility to extended-spectrum cephalosporins [ 5]. b Novel sequence types found in the present study.
Accordingly, detection of the currently known ESC genetic resistance determinants (penA mosaic allele or alteration of A501 in PBP2, mtrR and penB) does not strictly reflect the exact MICs of ESCs and, accordingly, cannot replace traditional culture-based AMR testing (which needs to be strengthened worldwide) or be used in the management of clinical patients.
Evolutionary change along the human lineage can be depicted as a series of nested and overlapping allele frequency alterations, some of which are undergoing recent selective sweeps at local or global levels, some of which have become fixed by positive selection or other processes, and some of which involve recent or ongoing accelerated change in some region, compared to other primates.
It is possible that allele-specific alterations in splicing are combined with effects on transcriptional levels.
Allele-specific alterations in binding of splice factors SFp40, ASP/SF2 are predicted for SNP12.
In GSTP1 polymorphism, the nucleotide transition of A 313 G leads to the Ile105Val substitution with the emergence of a new allele and the alteration of specific activities, compared to the wild type allele [ 18].
Thus, the effect of K-Ras 4A on tumorigenesis can be examined in the absence both of its oncogenic allele and of alteration in K- ras 4B expression as a consequence of K-Ras 4A deficiency.
Unequal expression from the two alleles of an over-represented, nonimprinted autosomal gene in a tumour (allelic expression imbalance or AEI) may reflect either genomic damage events such as chromosomal translocation or point mutation or it may indicate allele-specific epigenetic alteration involving DNA methylation or histone deacetylation.
Most polymorphic alleles will have no net effect overall, except when selection is currently leading to a substantial net alteration in allele frequencies.
We first undertook southern analysis with methylation-sensitive restriction enzymes to determine whether reactivation of the silenced allele is accompanied by alterations in DNA methylation at the gDMR location identified in Mus.
