Nurturing Life Sciences
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#Unit 2. Cellular Organization
H2AX is normally present in only 10%–15% of the nucleosomes in multicellular eukaryotes
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H2AX subtype is has a C-terminal tail that is distinct from the canonical H2A, characterized by a SQEL/Y motif at the end.
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SQEL/Y motif of H2AX is phosphorylated by ATM/ATR kinases, activated by DNA damage, is involved in DNA repair
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H2AX phosphorylated at the SQEL/Y motif is sometimes referred to as “gamma-H2AX,”
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Gamma-H2AX frequently functions in DSBR
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H2AZ variant has 60% sequence identity with canonical H2A and involved in gene activation, heterochromatin–euchromatin boundary formation, cell-cycle progression.