Analyses of chromosome copy number and expression level of four genes in the ciliate Chilodonella uncinata reveal a complex pattern that suggests epigenetic regulation.

Analyses of chromosome copy number and expression level of four genes in the ciliate Chilodonella uncinata reveal a complex pattern that suggests epigenetic regulation.
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对纤毛chilodonella uncinata中四个基因的染色体拷贝数和表达水平的分析揭示了一种复杂的模式,提示表观遗传调节。

DOI:
10.1016/j.gene.2012.04.067
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发表时间:
2012-08-10
期刊:
影响因子:
3.5
通讯作者:
Katz LA
Katz LA
中科院分区:
生物学3区
文献类型:
--
作者:
Bellec L;Katz LA

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Chilodonella uncinata,像所有纤毛虫一样,在每个细胞中含有两个不同的细胞核:一个生殖细胞微核和一个体细胞大核。大核是由合子核经过一系列染色体重排而形成的。C.大核发育uncinata产生具有高度扩增的基因大小的染色体的细胞核。大核在营养生长过程中具有转录活性,而微核中除了接合后的短暂时期外没有表达。纤毛虫的基因家族进化是通过复杂的过程发生的,包括基因复制和混杂基因的替代处理。在这里,我们使用定量PCR来比较8个基因(SSU-rDNA、Actin、α-Tubulin和5个β-Tubulin序列)的相对表达水平与它们作为大核染色体的丰度。我们发现,形态种C。钩齿龙在所有位点上都有相似的模式。例如,我们发现五个β-微管蛋白基因之间存在负相关,由此与丰度较低的染色体相比,丰度较高的大核染色体具有较低的表达水平。我们讨论了我们的发现的意义,这表明一个表观遗传机制维持染色体拷贝数在C。钩状的
Chilodonella uncinata, like all ciliates, contains two distinct nuclei in every cell: a germline micronucleus and a somatic macronucleus. The macronucleus develops from the zygotic nucleus through a series of chromosomal rearrangements. Macronuclear development in C. uncinata yields a nucleus with highly amplified gene-sized chromosomes. The macronucleus is transcriptionally active during vegetative growth while there is no expression in the micronucleus except during a brief period following conjugation. Gene family evolution in ciliates occurs through complex processes including gene duplication and an alternative processing of scrambled genes. Here we use quantitative PCR to compare relative expression levels of eight genes (SSU-rDNA, Actin, α-Tubulin and five β-Tubulin sequences) to their abundance as macronuclear chromosomes. We show that three strains of the morphospecies C. uncinata share similar patterns across all loci. For example, we find an inverse correlation among five β-tubulin genes whereby the more abundant macronuclear chromosomes have lower levels of expression compared to less abundant chromosomes. We discuss implication of ours finding, which suggest an epigenetic mechanism maintains chromosome copy number in C. uncinata.
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