gamma_H2A is a component of yeast heterochromatin required for telomere elongation

Histones of heterochromatin are deacetylated in yeast and methylated in more complex eukaryotes to regulate heterochromatin structure and gene silencing异染色质（heterochromatin）组蛋白（histones）在酵母中发生去乙酰化修饰，而在更复杂的真核生物中则发生甲基化修饰，以此调控异染色质结构与基因沉默。