The abstract is read at the publisher; the summary is JClub's.
N-terminal epitope tags on histone H3 abrogate the H3K27M-linked loss of H3K27 trimethylation, despite robust chromatin deposition of tagged H3.
- Why it matters: Epitope tags are widely used to detect histone PTMs, but H3 is sensitive to sequence changes; it was unclear whether tagging alters the K27M PTM phenotype.
- What they did: The study tested N- and C-terminal epitope tags on H3 by measuring H3K27 trimethylation levels in the context of the K27M mutation and confirming tagged H3 deposition in chromatin.
- The result: N-terminal tagging preserved H3K27 trimethylation under H3K27M conditions, implying N-terminal tags can mask this cancer-relevant PTM effect and should be used cautiously.
The findingWhy it mattersWhat they didThe result
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