mRNA Splicing - Minor Pathway

The splicing of a subset of pre-mRNA introns occurs by a second pathway, designated the AT-AC or U12-dependent splicing pathway. AT-AC introns have highly conserved, non-canonical splice sites that are removed by the AT-AC spliceosome, which contains distinct snRNAs (U11, U12, U4atac, U6atac) that are structurally and functionally analogous to the major spliceosome. U5 snRNA as well as many of the protein factors appear to be conserved between the two spliceosomes.

部分前mRNA内含子的拼接通过第二条途径进行，该途径被称为AT-AC或U12依赖性拼接途径。AT-AC内含子具有高度保守的非典型拼接位点，这些位点被包含独特snRNA（U11、U12、U4atac、U6atac）的AT-AC拼接体所去除，这些snRNA在结构和功能上与主要拼接体相似。U5 snRNA以及许多蛋白因子似乎在这两种拼接体之间保持保守。