Müller K, Schmitt R
Lehrstuhl für Genetik, Universität Regensburg, FRG.
Nucleic Acids Res. 1988 May 11;16(9):4121-36. doi: 10.1093/nar/16.9.4121.
Two Volvox genomic clones each containing a pair of histone H3-H4 genes were sequenced. In both loci the H3 and H4 genes show outwardly divergent polarity, their coding regions being separated by short intercistronic sequences containing TATA boxes and a conserved 14-bp element. The 3' untranslated regions contain a characteristic motif with hyphenated dyad symmetry otherwise only found associated with animal histone genes. Derived amino acid sequences of histones H3 and H4 are highly conserved and identical between the two sets. The Volvox H3 genes both contain one intron whose relative position is shifted by one basepair. Sequence comparisons led to a new interpretation of intron sliding. The Volvox H3 gene structure combines the exon-intron organization of fungal H3 and vertebrate H3.3 genes with a termination signal typical for animal H3.1 genes. These features are discussed in view of histone gene evolution.
对两个分别包含一对组蛋白H3 - H4基因的团藻基因组克隆进行了测序。在这两个基因座中,H3和H4基因呈现出向外发散的极性,它们的编码区域被包含TATA框和一个保守的14碱基元件的短基因间序列隔开。3'非翻译区包含一个具有连字符二元对称的特征基序,否则仅在与动物组蛋白基因相关联时才会发现。组蛋白H3和H4的推导氨基酸序列高度保守,两组之间完全相同。团藻的H3基因都包含一个内含子,其相对位置偏移了一个碱基对。序列比较导致了对内含子滑动的新解释。团藻H3基因结构将真菌H3和脊椎动物H3.3基因的外显子 - 内含子组织与动物H3.1基因典型的终止信号结合在一起。鉴于组蛋白基因的进化,对这些特征进行了讨论。