OENO IVAS 2019 banner
IVES 9 IVES Conference Series 9 OENO IVAS 9 OENO IVAS 2019 9 Grape and wine microorganisms: diversity and adaptation 9 Use of antisense RNA technology to modulate gene expression in Œnococcus oeni

Use of antisense RNA technology to modulate gene expression in Œnococcus oeni

Abstract

Œnococcus oeni is a wine-associated lactic acid bacterium performs the malolactic fermentation, which improves the taste and aromatic complexity of many wine. Although, wine exhibits harsh and challenging conditions (low pH, low temperature, nutrient-poor and presence of ethanol), O. oeni possesses a remarkable adaptability to those physiochemical conditions.

Mechanisms for responding to environmental changes are universally present in living beings and are essential for coping with the stress and for adapting to the new conditions. O. oeni tolerance to low pH and ethanol make its an interesting bacteria model for investigating stress response mechanism in lactic acid bacteria. However, lack of appropriate techniques to manipulate O. oeni genome has long delay molecular study of this fastidious bacterium. To get around the lack of genetic tool for gene replacement, we focused our work on gene inactivation by using antisense RNA approach to modulate gene expression. With the goal to understanding the function of O. oeni hsp genes in vivo, we produce antisense RNA targeting genes encoding: a small Hsp (hsp18)1, the master regulator of stress response (ctsR)2 and two caseinolytic protease L members of the HSP100 chaperone family (clpL1, clpL2). Thereby, we highlighted that in vivo inhibition of the expression of some of these genes strongly affects the survival of O. oeni in stress conditions.

This study presents an elegant approach providing access to an in vivo study of gene function in O. oeni.

References:

1. Darsonval, M., Msadek, T., Alexandre, H. & Grandvalet, C. The Antisense RNA Approach: a New Application for In Vivo Investigation of the Stress Response of Oenococcus oeni, a Wine-Associated Lactic Acid Bacterium. Appl. Environ. Microbiol. 82, 18–26 (2016).

2. Darsonval, M., Julliat, F., Msadek, T., Alexandre, H. & Grandvalet, C. CtsR, the Master Regulator of Stress-Response in Oenococcus oeni, Is a Heat Sensor Interacting With ClpL1. Front Microbiol 9, (2018).

DOI:

Publication date: June 10, 2020

Issue: OENO IVAS 2019

Type: Article

Authors

Cosette Grandvalet, Frédérique Julliat, Maud Darsonval, Tarek Msadek, Hervé Alexandre

UMR A 02.102 Procédés Alimentaires et Microbiologiques, AgroSup Dijon – Université de Bourgogne Franche-Comté, Dijon, FRANCE.
Unité de Biologie des Bactéries Pathogènes àGram Positif, Institut Pasteur, Paris, FRANCE.
CNRS ERL 6002, Paris, FRANCE.

Contact the author

Keywords

Oenococcus oeni, lactic acid bacteria, antisense RNA , stress response 

Tags

IVES Conference Series | OENO IVAS 2019

Citation

Related articles…

Evaluation of intra-vineyard spatial and temporal variability of leaf area index using multispectral images obtained by satellite (Landsat 8, Sentinel-2) and unmanned aerial vehicle platforms

Estimation of vineyard leaf area index (LAI) is an important aspect for the winegrowers. However, tracking and monitoring are difficult tasks due to time constraints. Satellite and unmanned aerial vehicle (UAV) imaging have become a practical monitoring method for LAI. Nevertheless, for a proper LAI determination, the image’s spatial resolution is a key factor, since low-resolution images are incapable of distinguishing between adjacent vines due to the large area covered in each pixel, this leads to misinterpretation or generalisation of vineyard information.

Read More

Early fermentation aroma profiles of grape must produced by various non-Saccharomyces starters

Saccharomyces cerevisiae is the most commonly used yeast species in winemaking. The recent research showed that non-Saccharomyces yeasts as fermentation starters show numerous beneficial features and can be utilized to reduce wine alcoholic strength, regulate acidity, serve as bioprotectants, and finally improve wine aromatic complexity. The majority of published studies on this topic investigated the influence of sequential or co-inoculations of non-Saccharomyces and S. cerevisiae yeasts on the aroma of final wine.

Read More

Phenology and maturation of Cabernet Sauvignon grapes from young vineyards at Santa Catarina state, Brazil – a survey of vineyard altitude and mesoclimat influences

Cabernet Sauvignon grapes from recently planted vines in Santa Catarina State (Brazil), were sampled during ripening from the 2005 and 2006 vintages.

Read More

Grapevine cane pruning extract enhances plant physiological capacities and decreases phenolic accumulation in canes and leaves 

Vine cane extracts are a valuable byproduct due to their rich content of polyphenols, vitamins, and other beneficial compounds, which can affect and benefit the vine and the grapes. This study aims to evaluate the response of grapevine plants to irrigation with water supplemented with a vine cane extract, both at physiology response and phenolic composition in different parts of the plant (root, trunk, shoot, leaf, and berry).
Cane extract was obtained by macerating crushed pruning residues with warm water (5:1) and pectolytic enzymes. Two-year-old potted plants were irrigated with water (Control) while others were irrigated with cane extracts, either at 1:4 (w/v, cane extract/water; T 1:4) or at 1:8 (w/v, cane extract/water; T 1:8).

Read More

Measurement of trans-membrane and trans-tissue voltages in the Shiraz berry mesocarp

In mid to late ripening, sugar and potassium (K+) accumulation into the berry slows and is eventually completed1. K+ is the most abundant cation in the berry, undertaking important physiological roles.

Read More