(a) Principle of the reactions underlying DDRT-PCR analysis. (N) Any of the four nucleotides G, A, T, or C. V can be any nucleotide besides T. (B) Any nucleotide. Recently, a new approach has successfully been developed: Differential-Display Reverse Transcription-PCR (DDRT-PCR). This technique has been proven to. Establishment of infection and disease implies modifications in the genetic programmes of the cell systems that are involved and the differential expression of.

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The antibacterial activity of the chosen bacterial isolate, named SA, was examined against S. The mixture was filtered using filter papers to remove the agar medium pieces and the ethanolic filtrate was undergoing to GC—MS analysis as described previously Ezhilan and Neelamegam ; Moustafa et al. Author information Article notes Copyright and License information Disclaimer. Verma and Verma reported the isolation and purification of antimicrobial peptide from celomic fluid of Indian earthworm Pheretima posthumous.

In vitro antifungal activity of Argemone ochroleuca Sweet latex against some pathogenic fungi. The purified bacterium was checked for its ability to antagonize some human pathogenic bacteria including Klebsiella pneumoniaeEscherichia coli and S.

Identification of the producer strain was performed using the partial nucleotide sequence of 16S rRNA gene, which indicated that this strain is identical to Pcd.

Differential display – Wikipedia

The products of endophytic bacterial isolate B. Compliance with ethical standards Conflict of interest All authors declare no conflict of interest.

Journal List 3 Biotech v. They identified the isolated peptide as serine protease that possesses a broad range of antimicrobial activity.

After completion, a fraction of the PCR mixture was examined using 1. Phytochemical and pharmacological screening of Sterculiaceae species and isolation of antibacterial compounds.

The production of antibiotics and hydrolytic enzymes pce a feature of many endophytic bacilli, including Bacillus cereus Pleban et al. Although chloramphenicol showed higher activity than our endophytic isolate; the antagonistic activity of this isolate is more preferred than this antibiotic.

The collected agar pieces clear zones were assumed to contain the active materials, and were extracted using absolute ethanol. It has been reported that many endophytic isolates provide beneficial effects to their hosts, like preventing disease development by synthesizing novel compounds and antifungal metabolites Khan and Doty Articles from 3 Biotech are provided here courtesy of Springer.


Earthworm- a potential source for stable and potent antimicrobial compounds- isolation and purification study. Introduction Endophytes have been defined as microorganisms bacteria or fungi which for all or part of their life cycle reside within the inner parts of plant tissues, but cause no symptoms of disease Vega et al.

Endophytic bacteria in Coffea arabica L. National Center for Biotechnology InformationU. Differential display can offer some favors regarding this point, especially in the identification fdrt some up-regulated or down-regulated genes under specific conditions.

Moustafa1, 2 Tarek H. Biocontrol of plant disease: Comparing the antagonistic effect of the isolated bacteria SA with different antibiotics To rate and determine the exact effect of the isolate SA against S. Eicosane and ethyl acetate extract of Spirulena platensis consisted of heptadecane and tetradecane showed antimicrobial activities against some Gram positive and Gram negative bacteria and Candida albicans Ozdemir et al.

Application of differential display RT-PCR revealed that the isolate was able to up-regulate a gene with serine protease like protein.

This factor has a broad spectrum of activity against Gram-positive and specifically against Staphylococcus aureus MRSA. This gene was up-regulated, excised from the gel and submitted for gene sequencing Fig.

This study focuses on the isolation of endophytic bacteria which are able to cease and inhibit the growth and spreading of methicillin resistant S. Ddrt bacterial production and secretion of serine protease for antimicrobial function is not yet documented.

Differential display

Unveiling of up-regulated or down-regulated genes Any external effect on the organism can affect its genetic behavior in a way of over or down expression of the genes according to the kind of the stimulant.

A review on production of serine alkaline protease by Bacillus spp. ;cr4, 5 and Sulaiman A. The protein is well ddr as antimicrobial agent and was reported to be produced by plants, animals and insects. The reasons for this hypothesis came from that there are many recorded disadvantages of chloramphenicol including the risk of its side effects, rising of resistance rates and uncomfortable posology Ddet et al. To rate and determine the exact effect of the isolate SA against S. Components in the ethanol extract of inhibition zone slices GC—MS chromatogram analysis of the ethanol extract of inhibition zone parts s howed eight peaks that led to the identification of a number of compounds Fig.


Results and discussion Isolation and cpr activity of endophytic bacteria It is well known that, the isolation of bacteria that are capable of invading the inner tissues of a certain plant is a critical process.

Both of the pathogenic strain S. Endophytes have been defined as microorganisms bacteria or fungi lcr for all or part of their life cycle reside within the inner parts of plant tissues, but cause no symptoms of disease Vega et al. To investigate the upregulated or downregulated genes during the antagonistic process, both of the pathogenic and the antagonistic bacteria were grown either separately on two different nutrient agar plates or close to each other on the same plate.

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Multiple sequence alignment, molecular phylogeny and phylogenetic tree were performed using MEGA 5 software Fig. Exploring these novel compounds and metabolites may lead to the discovery of new drugs for antibiotic resistant pathogenic bacteria like methicillin resistant Staphylococcus aureus MRSA.

Conclusion The products of endophytic bacterial isolate B. The sterilized cubic stem parts were then divided into two pieces using a sterilized razor blade. Decane, tetradecane, pyrrolo [1,2-a] pyrazine-1,4-dione, hexahydro- and 2H-Chromenecarboxamide, 8-allyloxo- N -[2- 2-methyl-1H-indolyl ethyl]-found to be the minor components 4.

The cultivated endophytic drt isolates were transferred to new nutrient agar NA plates for purification. The obtained sequence was compared with the sequences deposited in Sdrt data base http: