Transcription of intergenic spacer of the rRNA gene

Intergenic spacer regions (IGS) located between rRNA transcription units contain upstream promoters and are transcribed by RNA Polymerase I. The IGS transcripts originate approximately 2 Kb upstream of the start of rRNA transcription and proceed though the main promoter of the rRNA gene.

位于rRNA转录单元之间的间隔区（IGS）包含上游启动子，并由RNA聚合酶I进行转录。IGS转录本起源于rRNA转录起始点上游约2千碱基处，并延续至rRNA基因的主要启动子区域。