ژن‌های خانواده ‏FAD‏ در گستره ژنوم ریزجلبک اسپیرولینا ‏‏(‏Arthrospira platensis‏) و بررسی ‏عملکرد‌های سلولی در پاسخ به تنش‌های ‏غیر زیستی

نوع مقاله : علمی پژوهشی

نویسندگان

1 دانشکده علوم زراعی، گروه اصلاح نباتات، دانشگاه علوم کشاورزی و منابع طبیعی ساری

2 استاد، گروه مهندسی ژنتیک و بیولوژی، پژوهشکده ژنتیک و زیست فناوری کشاورزی طبرستان، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ایران

3 دانشیار، گروه اصلاح نباتات، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ایران

4 گروه مرکبات و گیاهان دارویی، پژوهشکده ژنتیک و زیست فناوری کشاورزی طبرستان، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ایران

چکیده

ریزجلبک Arthrospira platensis یک پروکاریوت فتوسنتزکننده ارزشمند با مصارف صنعتی و غذایی متعدد می‌‌‌باشد. آنزیم‌های اسید چرب دساچوراز (FADs) مسئول تولید اسیدهای چرب غیر‌اشباع تک و چندگانه هستند. در مطالعه حاضر با استفاده از راهکارهای بیوانفورماتیکی، ژنوم A. platensis C1 به منظور شناسایی ژن‌های خانواده ApFAD بررسی شد. تعداد 8 ژن ApFAD در ژنوم اسپیرولینا شناسایی و به گروه‌های Omega، Sphingolipid، CrtR_beta-carotene-hydroxylase و Acyl-CoA، طبقه‌بندی شدند. چهار موتیف هیستیدینی حفاظت شده که برای اتصال به ساختارهای دای-آهن و فعالیت‌های کاتالیزوری ضروری هستند، شناسایی شدند. بررسی تغییرات پس از ترجمه پروتئین‌های ApFAD طیف گسترده‌ای از تغییرات گلیکوزیلاسیون و فسفریلاسیون را نشان داد. بررسی نواحی پروموتری ژن FAD انواع مختلفی از عناصر تنظیمی سیس پاسخگو به فیتوهورمون‌ها و شرایط تنش، به‌ویژه در دساچورازهای امگا (ApFAD-6) و آسیل-لیپید (ApFAD-3) را نمایان ساخت. همچنین، شبکه‌های برهم‌کنش پروتئین-پروتئین تعامل بین ApFADها و ژن‌های دخیل در مقابله با تنش به واسطه فرآیند بیوسنتزی متابولیت‌های ثانویه و نیز انتقال الکترون را نشان دادند. آنالیز داده‌‌های RNA-seq ژن‌های ارتولوگ در آرابیدوپسیس، پتانسیل ژن‌های گروه امگا و آسیل-لیپید در اسپیرولینا، مانند ژن‌های ApFAD-3، ApFAD-6 و ApFAD-7، را در پاسخ‌ به تنش‌های محیطی مختلف نشان داد. بطورکلی، نتایج این تحقیق می‌تواند به درک و شناخت کاملتر عملکرد ژن‌های FAD در اسپیرولینا کمک کرده و زمینه را برای دستورزی این ژن‌ها با هدف افزایش محتوای اسیدهای چرب غیراشباع و بهبود ارزش تغذیه‌ای روغن‌ها و نیز افزایش تحمل گیاهان به تنش‌های محیطی مختلف فراهم نماید.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Identification of FAD family genes in the genome of Spirulina (Arthrospira platensis) microalgae and investigation of cellular functions in response to abiotic stresses

نویسندگان [English]

  • Sahar Faraji 1
  • Ghorbanali Nematzadeh 2
  • Seyed Kamal Kazemitabar 3
  • Ali Pakdin-Parizi 4
1 Department of Plant Breeding, Sari Agricultural Sciences and Natural Resources University (SANRU), Sari, Iran
2 Professor, Genetics and Agricultural Biotechnology Institute of Tabarestan, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
3 Associated Professor, Department of Plant Breeding, Sari Agricultural Sciences and Natural Resources University (SANRU), Sari, Iran
4 Citrus and medicinal plants department, Genetics and Agricultural Biotechnology Institute of Tabarestan (GABIT), Sari Agricultural Sciences and Natural Resources University, Sari, Iran
چکیده [English]

Arthrospira platensis (Spirulina) is a valuable photosynthesizing prokaryote with numerous industrial and food applications. Fatty acid desaturase enzymes (FADs) are responsible for the production of monounsaturated and polyunsaturated fatty acids. In the present study, the genome of A. platensis C1 was investigated using bioinformatics methods in order to identify ApFAD genes family. A total of 8 ApFAD genes were identified in Spirulina genome and classified into Omega, Sphingolipid, CrtR_beta-carotene-hydroxylase and Acyl-CoA groups. Four conserved histidine motifs that are essential for binding to the di-iron structures and catalytic activities were identified. Investigation of post-translational modifications of ApFAD proteins revealed a wide range of glycosylation and phosphorylation changes. Evaluation of FAD gene promoter regions revealed different types of cis-regulatory elements responsive to phytohormones and stress conditions, especially in Omega (ApFAD-6) and Acyl-lipid (ApFAD-3) desaturases. Also, protein-protein interaction networks showed the relations between ApFADs and genes involved in dealing with stresses through the biosynthetic process of secondary metabolites and electron transfer. Analysis of RNA-seq data of orthologous genes in Arabidopsis showed the potential of Omega and Acyl-lipid genes, such as ApFAD-3, ApFAD-6 and ApFAD-7, in response to various environmental stresses. In general, the results of this study can contribute to a more complete understanding of the function of FAD genes in Spirulina and lay the basis for the transgenic study of these genes with the aim of increasing the content of unsaturated fatty acids, improving the nutritional value of oils, as well as promoting the stress tolerance of plants.

کلیدواژه‌ها [English]

  • Arthrospira platensis
  • Bioinformatic analysis
  • Fatty acid desaturase
  • Genome analysis
  • Stress dealing
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