首页> 外文期刊>Journal of Molecular Biology >TARGETED DISRUPTION OF AN H3-IV/H3-V GENE PAIR CAUSES INCREASED EXPRESSION OF THE REMAINING H3 GENES IN THE CHICKEN DT40 CELL LINE
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TARGETED DISRUPTION OF AN H3-IV/H3-V GENE PAIR CAUSES INCREASED EXPRESSION OF THE REMAINING H3 GENES IN THE CHICKEN DT40 CELL LINE

机译:H3-IV / H3-V基因对的定向破坏导致鸡DT40细胞株中剩余的H3基因表达增加

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摘要

The chicken H3 gene family contains 12 members (H3-I to H3-XII). Nine of them belong to two major histone gene clusters, but the genomic locations of the others are unknown. In the DT40 chicken B cell line, H3-IV and H3-V, which are located in inverted orientation and share a 3'-untranslated region of 531 bp, produce about 24% of the steady-state level of total mRNAs from all the H3 genes. To study the nature of these two genes, we carried out targeted integration into DT40 cells of constructs of the H3-IV/H3-V locus. Analysis of the stable transfectants showed that the growth rate of DT40 cells was unchanged in the absence of two copies of the H3-IV/H3-V locus. Furthermore, the remaining H3 genes were shown to be expressed more in the mutants lacking one or two H3-IV/H3-V alleles than DT40 cells, and the steady-state level of total H3 mRNAs remained constant in all the mutant cell Lines tested. The levels of mRNAs from the H2B and H1 genes, which are located close to the H3 genes, were unchanged. These results demonstrate that the chicken H3 gene family has the ability to compensate for disruption of H3-IV/H3-V, which are normally responsible for about 24% of total H3 mRNAs. [References: 42]
机译:鸡H3基因家族包含12个成员(H3-I至H3-XII)。它们中的九个属于两个主要的组蛋白基因簇,但其他的基因组位置未知。在DT40鸡B细胞系中,H3-IV和H3-V位于反方向,共有一个531 bp的3'-非翻译区,可从所有细胞中产生总mRNA稳态水平的约24%。 H3基因。为了研究这两个基因的性质,我们将H3-IV / H3-V基因座的构建体定向整合到DT40细胞中。对稳定转染子的分析表明,在没有两个拷贝的H3-IV / H3-V基因座的情况下,DT40细胞的生长速率没有变化。此外,剩余的H3基因在缺乏一或两个H3-IV / H3-V等位基因的突变体中比DT40细胞表达更多,并且在所有测试的突变细胞系中总H3 mRNA的稳态水平保持恒定。位于H2基因附近的H2B和H1基因的mRNA的水平没有变化。这些结果表明,鸡H3基因家族具有补偿H3-IV / H3-V破坏的能力,H3-IV / H3-V通常占总H3 mRNA的约24%。 [参考:42]

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