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CrMAPK3 regulates the expression of iron-deficiency-responsive genes in Chlamydomonas reinhardtii

文献类型： 外文期刊

作者： Fei, Xiaowen 1 ; Yu, Junmei 2 ; Li, Yajun 2 ; Deng, Xiaodong 2 ;

作者机构： 1.Hainan Med Coll, Sch Sci, Haikou 571101, Peoples R China

2.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Key Lab Trop Crop Biotechnol, Minist Agr, Haikou 571101, Peoples R China

关键词： Chlamydomonas reinhardtii;Mitogen-activated protein kinases;Iron deficiency;Real-time PCR

期刊名称：BMC BIOCHEMISTRY （ 影响因子：4.059； 五年影响因子：2.24 ）

ISSN： 1471-2091

年卷期： 2017 年 18 卷

页码：

收录情况： SCI

摘要： Background: Under iron-deficient conditions, Chlamydomonas exhibits high affinity for iron absorption. Nevertheless, the response, transmission, and regulation of downstream gene expression in algae cells have not to be investigated. Considering that the MAPK pathway is essential for abiotic stress responses, we determined whether this pathway is involved in iron deficiency signal transduction in Chlamydomonas. Results: Arabidopsis MAPK gene sequences were used as entry data to search for homologous genes in Chlamydomonas reinhardtii genome database to investigate the functions of mitogen-activated protein kinase ( MAPK) gene family in C. reinhardtii under iron-free conditions. Results revealed 16 C. reinhardtii MAPK genes labeled CrMAPK2-CrMAPK17 with TXY conserved domains and low homology to MAPK in yeast, Arabidopsis, and humans. The expression levels of these genes were then analyzed through qRT-PCR and exposure to high salt ( 150 mM NaCl), low nitrogen, or iron- free conditions. The expression levels of these genes were also subjected to adverse stress conditions. The mRNA levels of CrMAPK2, CrMAPK3, CrMAPK4, CrMAPK5, CrMAPK6, CrMAPK8, CrMAPK9, and CrMAPK11 were remarkably upregulated under iron- deficient stress. The increase in CrMAPK3 expression was 43- fold greater than that in the control. An RNA interference vector was constructed and transformed into C. reinhardtii 2A38, an algal strain with an exogenous FOX1: ARS chimeric gene, to silence CrMAPK3. After this gene was silenced, the mRNA levels and ARS activities of FOX1: ARS chimeric gene and endogenous CrFOX1 were decreased. The mRNA levels of iron- responsive genes, such as CrNRAMP2, CrATX1, CrFTR1, and CrFEA1, were also remarkably reduced. Conclusion: CrMAPK3 regulates the expression of iron-deficiency-responsive genes in C. reinhardtii.

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