کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10890641 | 1081730 | 2013 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Assessment of the viability of Cryptosporidium parvum oocysts with the induction ratio of hsp70 mRNA production in manure
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
بیوتکنولوژی یا زیستفناوری
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Determining the presence of viable Cryptosporidium parvum oocysts in complex environmental matrices in hygiene control can prevent the contamination of water resources and food with this pathogen. This study assessed the induction ratio of hsp70 mRNA production by heat shock in different oocysts as a marker of viability. Using different procedures for (m)RNA extraction directly from manure and reverse transcription real-time qPCR, this study found slightly increased hsp70 mRNA contents in viable oocysts that were heat shock induced at 45 °C for 20 min compared to not induced oocysts (1.6 fold induction in average). Prolonging the heat shock treatment to 2 h did not further increase the copy numbers. Heat shock by consecutive stimuli, such as freezing and then heating, did not yield significantly higher copy numbers than the 45 °C treatment. There was a certain background level of hsp70 mRNA in viable oocysts that were not exposed to heat shock, indicating a constitutive production of the transcripts in the oocysts. The production of hsp70 mRNA induced by heat shock in oocysts aged for 9 months that exhibited reduced viability was lower than in fresher oocysts (induction ratio < 1.2). No production of hsp70 mRNA by heat shock was detected in 12 months old oocysts that were not viable in the excystation test. Oocysts inactivated at 75 °C for 30 min were not able to respond to heat shock, and low amount of copies were occasionally measured only in total RNA extracts, but not in mRNA extracts that were purified directly with an oligo (dT)25 based system. The induction ratio of hsp70 mRNA varied according to the viability of the organisms in a sample. Copy numbers of β-tubulin mRNA in viable oocysts were lower than hsp70 mRNA, therefore the latter is more suitable to detect low numbers of oocysts by RT-qPCR.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Microbiological Methods - Volume 94, Issue 3, September 2013, Pages 280-289
Journal: Journal of Microbiological Methods - Volume 94, Issue 3, September 2013, Pages 280-289
نویسندگان
Gabriela Garcés-Sanchez, Peter A. Wilderer, Harald Horn, Jean-Charles Munch, Michael Lebuhn,