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. 2022 Mar 17;12:861078. doi: 10.3389/fonc.2022.861078

Figure 2.

Figure 2

Detection of mutant IDH1 by immunohistochemistry, NGS and Sanger sequencing. (A) Astrocytoma cells are diffusely and strongly stained with anti-IDH1 (R132H) antibody (immunoperoxidase; original magnification 200x). (B) Corresponding IDH1 c.395G>A (p. R132H) mutation detected by NGS. Results were viewed in the Integrative Genomics Viewer (IGV). (C) The chromatogram showing representative sequencing results of IDH1 c.395G>A (p. R132H). (D) Absence of IDH1 (R132H) immunoreactivity in a IDH1- (R132S)-mutant astrocytoma. (E) IDH1 c.394C>A (p. R132S) mutation detected by NGS. Results were viewed in the IGV. (F) The chromatogram showing the representative sequencing results of IDH1 c.394C>A. Note that IDH1 is a negative-sense gene with respect to the genomic reference sequence. Thus, any nucleotide change is displayed as reverse complement. The arrow symbols on chromatogram indicate the place of mutation.