DNA甲基化是双链都甲基化还是只有一条链甲基化？

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hi!" R, u3 X/ T8 \/ b  o
sorry about that I can only type the English
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9 ]3 v9 }  U/ l1 C/ Q6 `The DNA is homomethylated in mammalian genome. ; y( @# Y6 d! a
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DNMT1 prefers methylating hemimethylated DNA target sites.(proven and reported: The Dnmt1 DNA-(cytosine-C5)-methyltransferase methylates DNA processively with high preference for hemimethylated target sites)
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) ?+ ?3 }$ A" F+ l) Z) eAnd your third question is about overlapping genes. Overlapping genes in mammalian genomes are unexpected phenomena even though hundreds of pairs of protein coding overlapping genes have been reported so far. overlapping gene regulation in living organisms  even from viruses to advanced mammalian are not fully understood.