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Finn, L.; Onyeaka, H.; O’neill, S. Listeria monocytogenes Biofilms in Food-Associated Environments. Encyclopedia. Available online: https://encyclopedia.pub/entry/49152 (accessed on 19 May 2024).
Finn L, Onyeaka H, O’neill S. Listeria monocytogenes Biofilms in Food-Associated Environments. Encyclopedia. Available at: https://encyclopedia.pub/entry/49152. Accessed May 19, 2024.
Finn, Lawrence, Helen Onyeaka, Sally O’neill. "Listeria monocytogenes Biofilms in Food-Associated Environments" Encyclopedia, https://encyclopedia.pub/entry/49152 (accessed May 19, 2024).
Finn, L., Onyeaka, H., & O’neill, S. (2023, September 14). Listeria monocytogenes Biofilms in Food-Associated Environments. In Encyclopedia. https://encyclopedia.pub/entry/49152
Finn, Lawrence, et al. "Listeria monocytogenes Biofilms in Food-Associated Environments." Encyclopedia. Web. 14 September, 2023.
Listeria monocytogenes Biofilms in Food-Associated Environments
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This entry is adapted from the peer-reviewed paper 10.3390/foods12183339

Listeria monocytogenes (LM) is a bacterial pathogen responsible for listeriosis, a foodborne illness associated with high rates of mortality (20–30%) and hospitalisation. It is particularly dangerous among vulnerable groups, such as newborns, pregnant women and the elderly. The persistence of this organism in food-associated environments for months to years has been linked to several devastating listeriosis outbreaks. It may also result in significant costs to food businesses and economies. 

Listeria monocytogenes persistence biofilm food-associated environment

1. Introduction

Listeria monocytogenes (LM) is a Gram-positive bacillus responsible for the foodborne illness listeriosis [1][2][3]. Most listeriosis cases are sporadic, but significant outbreaks have also been reported [4][5][6]. These have been associated with a whole range of foods—most often ready-to-eat foods, such as sliced cooked meats, pork pies, crab meat and pate [7][8][9]. While the incidence of listeriosis is relatively low, it is a significant concern to public health due to its high mortality (20–30%) and hospitalisation rates [3][10]. The disease is especially dangerous in the elderly, immunocompromised, newborns, pregnant women and their unborn infants—causing septicaemia, meningitis, miscarriage and stillbirth [1][7].
LM is ubiquitous in the environment and able to grow under a range of adverse conditions, including a wide temperature (−0.4 to +45 °C) and pH range (4.4–9.4) and low aw (down to 0.90) [3]. This makes it well adapted to growth and survival in food-associated environments [11]. There are 14 LM serotypes, with serotype 4 h being the most recently recognised [4]. However, >95% of human infections are caused by just three serotypes (1/2a, 1/2b, and 4b) [12]. The serotypes are divided into four phylogenetic lineages (I-IV) [13]. These, in turn, are subdivided into sequence types (STs) and clonal complexes (CCs) by multilocus sequence-typing (MLST)—with most isolates belonging to lineages I and II [14].
It is well established that LM can persist in a range of food-associated environments for months or years, despite cleaning and disinfection [15][16][17][18]. While there is no standardised definition of persistence, it is generally used to describe the long-term survival of a bacterial strain in a food-associated environment over time; it is based on recurrent isolation of listerial strains from a facility on different dates over a defined period, which are found to belong to the same molecular subtype [4][18]. Persistent strains have been recovered from a range of food and non-food contact surfaces, such as tables, floors and drains, as well as equipment, utensils and raw materials (among others) [18]. The exact criteria used to establish persistence, such as the number of isolation events, time frame or choice of subtyping method, vary widely between studies and are often subjective [17][18][19].
The persistence of LM poses a serious food safety concern due to its potential to result in food contamination [8][18]. This has been implicated in several devastating listeriosis outbreaks [8][15]. One of the most renowned occurred in the US in 2000 [20]. It involved 29 cases and four deaths and was caused by an LM strain that persisted in a meat processing plant over 12 years. Given the high levels of contamination and exposure usually required for a given subtype to cause infection, it has been suggested that most listeriosis outbreaks may be caused by persistent LM subtypes repeatedly contaminating products over prolonged periods [18]. Persistent product contamination is also burdensome to food businesses and economies, resulting in costly recalls, withdrawals, seizures, closures and reputational losses [18]. 
The mechanisms responsible for listerial persistence are not well understood [18][21]. Some have hypothesised that persistence might be due to increased tolerance towards commercially used disinfectants or enhanced adaptation towards some of the stresses encountered in food-associated environments [22][23]. However, a lack of clear evidence has been found to support this; this has led some to postulate that persistence is mainly due to a failure of cleaning and sanitation procedures, as opposed to any unique strain properties [17][18]. One of the most widely explored hypotheses is that persistent strains are more capable of producing biofilms on abiotic surfaces in food-associated environments [24][25][26].

2. LM Biofilms

A biofilm is a ‘community of microbes associated with a surface, typically encased in an extracellular matrix’ (EM) (Figure 1) [27]. This is consistent with the mix of biofilm morphologies described for LM. Dependent on the strain and environmental conditions, these range from knitted chains and dense, three-dimensional structures resembling mushrooms or honeycombs, to cellular monolayers—with little or no EM [26][28][29][30]. The range of surfaces on which listerial biofilms may develop is equally varied and includes stainless steel, glass, rubber and plastics (among others) [26][28][31][32]. It is unclear if the lack of EM reported in LM biofilms results from microscopy sample preparation or the experimental conditions [13]. However, the EM of LM biofilms mainly comprises extracellular DNA, proteins and exopolysaccharides—particularly teichoic acids [33].
Biofilm development is a multi-staged process, beginning with adherence to a surface (Figure 2). Adherence is reversible within minutes to hours of surface contact, relying on a combination of physical forces and/or bacterial appendages, such as flagella [34]. It is mediated by weak interactions, such as Van der Waals interactions, electrostatic forces and hydrophobic interactions [16]. During this phase, bacterial cells still exhibit Brownian motion and can easily be removed—for example, by rinsing [35]. However, stronger interactions eventually develop between the cells and the surface, such as covalent and ionic bonding, mediated by exopolysaccharide fibrils, flagella and/or other surface appendages. At this point, adherence is considered irreversible, as the cells can only be removed by shearing forces, such as scrubbing or scraping, or by chemical breaking of the attachment forces, such as by enzymatic, detergent and/or heat treatment [34].
Figure 1. Schematic diagram of a mature Listeria monocytogenes (LM) biofilm with a three-dimensional mushroom shape. Mature biofilms formed under field conditions may contain other microorganisms [1]. Green arrows represent some of the main survival advantages associated with cells within the biofilm compared with their planktonic counterparts, which may allow them to persist in food-associated environments [36][37][38].
Foods 12 03339 g002
Figure 2. Diagram representing the key stages of biofilm development (image adapted from Colagiorgi et al. [1] under the terms and conditions of the Creative Commons Attribution (CC BY) license, http://creativecommons.org/licenses/by/4.0/ (Accessed 21 June 2023)). (a). Planktonic cells begin by adhering reversibly to a surface via Van der Waals forces and other weak interactions between cell surface structures and the material they are in contact with [2]. (b). The cells begin to establish stronger interactions between themselves and the surface, such as covalent bonding. These interactions are mediated by cellular appendages and by deposition of extracellular matrix (EM). Adherence becomes irreversible. (c). The adherent cells multiply and recruit other cells from the surrounding environment, producing microcolonies. (d). Eventually, a mature biofilm is produced, characterised by a complex three-dimensional structure with its own ecosystem. It includes pores for nutrient exchange and waste removal (e). Cells within the biofilm disperse, returning to a planktonic state, which allows them to colonise new surfaces.
A range of environmental factors can influence listerial biofilm development. These have been discussed extensively elsewhere, and so are touched upon only briefly here [1][13][16][37]. One of the main factors appears to be temperature [1]. Studies generally report that LM adherence and biofilm formation increases as temperature increases up to 30–37 °C [38][39][40][41][42][43], possibly due to changes in cell surface properties, such as hydrophilicity [32][44]. The properties of the surface material also have an important effect on listerial biofilm development, such as topography [16].
Other important factors that can influence listerial biofilm development include pH, NaCl concentration and nutrient availability [13][16]. The attachment of LM to stainless steel was found to be significantly greater in suspensions containing 0.15 M, compared with 0.0015 M NaCl [39]. It has been hypothesised that this may have resulted from alterations in cell surface hydrophobicity [45][46].

3. The Contribution of Biofilms towards Microbial Persistence within Food-Associated Environments

There are several ways in which enhanced biofilm production might contribute towards the persistence of microorganisms within food-associated environments. Firstly, biofilm production represents an important survival strategy for many microorganisms. Compared with their planktonic counterparts, biofilm-associated bacteria can be difficult to remove mechanically from surfaces and are known to exhibit marked reductions in sensitivity towards chemical disinfectants, which may allow them to resist conventional cleaning methods [47]. Secondly, biofilm formation may help bacterial cells adapt to other environmental stresses encountered in food-associated environments, such as high temperature, acidic pH, desiccation, UV and high salinity [48]. Thirdly, biofilm cells may be more capable of sequestering toxins, metabolic cooperation and nutrient exchange [49].
Non-typhoidal S. enterica is a Gram-negative bacillus and a common cause of foodborne gastroenteritis, usually associated with poultry products [50]. However, contaminated meat, fresh produce, nuts, spices, flour, milk and drinking water can also act as vehicles [50]. Like LM, S. enterica is able to form biofilms on a range of surface materials and to persist in food-associated environments, such as poultry slaughterhouses [51]. Vestby et al. [52] reported that the biofilm-forming ability of 111 Salmonella strains isolated from feed and fish meal factories was correlated with their persistence within the factory environment. 
E-coli is a Gram-negative bacillus, which is closely related to S. enterica [50]. While most strains are non-pathogenic, some are highly pathogenic. For example, the Shiga-toxin-producing strain E-coli O157:H7 can cause haemorrhagic colitis and potentially life-threatening haemolytic uraemic syndrome [50]. E-coli outbreaks are associated with the consumption of raw meat or meat products, as well as fresh produce [50]. The organism was found to persist on a conveyor belt in a meat packing plant, surviving daily cleaning and disinfection practices [53]. Beef-production companies have also been known to experience periods of increased product contamination caused by E-coli O157:H7 [54], most likely due to persistent contamination of the processing environment [55].
Campylobacter spp. are Gram-negative, microaerophilic bacilli [56]. They are the common cause of bacterial gastroenteritis globally, particularly C. jejuni and C. coli [57]. Like Salmonella, infection is usually associated with poultry meat, as well as other foods, such as raw milk [56]. The organism requires specific conditions to grow, such as a microaerophilic atmosphere and a temperature between 37 °C and 42 °C [56]. It is also sensitive to food-processing conditions, such as acidic pH [56]. Despite this, there is evidence that it can persist within food-associated environments, such as farms and dairies, by forming biofilms [57].

4. Phenotypic Comparisons of Biofilm Development in Persistent and PNP LM Strains

Several studies have reported evidence of enhanced biofilm formation among persistent LM strains [19][24][26][36][58][59][60][61][62]. For example, Norwood and Gilmour [24] measured the adherence to stainless steel coupons of 32 persistent and 25 PNP strains isolated from farms and food processing plants. After 24 h of surface contact at 25 °C, mean plate counts on the coupons were significantly higher for the persistent strains. Similar results were obtained by Lunden et al. [58] after they compared the adherence of a persistent strain to that of three PNP strains isolated from meat dicing plants on stainless steel coupons over two hours at 25 °C using epifluorescence microscopy counts. 

A similar number of studies have reported no apparent difference between the biofilm formation of persistent and PNP LM strains [43][63][64][65][66][67][68][69][70][71][72][73]. For example, Djordjevic et al. [63] compared the biofilm formation of five persistent and five PNP strains isolated from fish processing plants to PVC microtiter plates using the crystal-violet method; after 40 h of surface contact at 32 °C, no relationship was observed between the biofilm levels of the persistent and PNP strains.

Factors that may explain the inconsistent findings between studies could include differences in experimental conditions, such as incubation temperature, surface material and nutrient availability [1][13][16][37].

The biofilm formation of persistent LM strains has also been found to vary according to the composition and concentration of the growth medium [19][40][74] and the surface material [75]. For example, Lee et al. [40] found that persistent strains exhibited significantly increased biofilm formation compared with PNP strains, but only in neat (undiluted), as opposed to dilute (1:10), brain heart infusion (BHI) broth. 

In addition to different experimental conditions, there are several other factors that might account for the conflicting results between studies investigating the relationship between biofilm formation and persistence. These include differences in the choice of biofilm assay, sample size, persistence definitions, and/or test strain properties, such as lineage or serotype [4][26]. Differences in biofilm formation according to serotype have been reported in E-coli, with serotype O103:H2 isolates shown to produce more biofilm at 12 °C, 20 °C and 37 °C, compared with strains representative of serotypes O26:H11 or O103:H25 [76].

5. Genetic Mechanisms Involved in Biofilm Development in LM

With advances in WGS techniques, a few studies have compared the genomes of persistent and PNP LM strains to identify genetic markers that may help to explain, identify or predict persistence. This includes markers associated with biofilm production (summarised in Table S1). The following section provides an overview of the functions of some of the main genetic loci associated with biofilm formation in LM, which have been investigated for an association with persistence in WGS studies, before going on to discuss the key findings of these studies.
One of the main biofilm-associated genes in LM is flaA, which encodes the main structural component of the bacterial flagella, flagellin A [77]. Flagella-mediated motility appears to promote initial attachment under both static and dynamic conditions but is not essential for—and may even inhibit—full biofilm formation under dynamic conditions [78][79][80][81]. Expression of flaA in LM is controlled by at least five other regulatory genes [77]. Some of these genes have also been shown to be required for effective biofilm development, which may be due, in part, to their effect on flagella expression and motility. These include the positive regulatory factor A gene, prfA, involved in the later stages of biofilm development [82][83], and the degradation enzyme regulator gene (degU), involved in adherence to plastic surfaces [84][85].
The actin-assembly-inducing peptide precursor (ActA), encoded by actA, is another important virulence determinant in LM, which promotes bacterial aggregation and biofilm development [86]. Compared with wild-type (WT) strains, ΔactA mutant strains exhibit significant reductions in biofilm development on glass under both static and dynamic conditions due to reduced clustering. The transcriptional regulator of stress response genes, SigB, is also required to reach WT biofilm levels under both static and continuous-flow conditions on stainless steel and polystyrene [87][88]. However, it may only be involved in the later stages of biofilm development, as no difference in biofilm levels was observed between WT and SigB-deficient strains after 24–40 h of surface contact [80][87]. Contrastingly, the biofilm-associated protein (BapL), encoded by bapL, appears to be involved in adherence in some LM strains, but its exact role in biofilm development is not well understood [77][89]. 
The listerial virulence proteins internalins A and B (InlA and InlB) have also been implicated in listerial biofilm development [89]. Deletion of inlA or inlB in LM EGD-e has been associated with significant reductions in adherence to glass compared with a WT strain, especially when both genes are deleted [90][91]. However, inlA truncation has been associated with increased biofilm production compared with WT strains [92]. The truncated protein lacks the cell wall-binding domain and is secreted where it undergoes proteolytic cleavage and may contribute towards the biofilm EM. Internalin L (InlL) appears to play a similar role in listerial adherence, as deletion of inlL has been associated with reduced attachment to polystyrene [93].
The agrBDCA operon is a peptide-based QS system in LM that plays an important role in biofilm development [94][95][96]. It consists of four genes, including agrC, agrA, agrD and agrB, respectively encoding a histidine kinase (AgrC), a response regulator (AgrA), a precursor peptide (AgrD) and a protein (AgrB), which converts the precursor peptide into an autoinducing peptide. LM ΔagrA and ΔagrD deletion mutants both exhibit significant reductions in adherence to glass or polystyrene surfaces compared with WT strains within the first 24 h of surface contact [94][95].
The LuxS system is another QS system in LM that has been implicated in biofilm development [11][77]. It encodes a protein (LuxS) involved in producing autoinducer-2 (AI-2) precursor molecules [97]. LM strains with mutations in luxS have been known to produce denser biofilms and to attach more readily to glass compared with WT strains [98][99]. 

6. WGS Comparisons of Biofilm Production in Persistent and PNP LM Strains

One of the most comprehensive attempts to identify persistence markers was conducted by Nielsen et al. [100]. Based on a literature search, the authors identified 15 genes which might play a role in persistence. Six of them were chosen due to evidence of involvement in biofilm production, including actA, bapL, recO, lmo2504, luxS and the flagellar operon gene, lmo0673. They used WGS to compare the genomes of 21 persistent and 17 PNP strains isolated from pork and salmon-processing plants to see whether any of these genes were overrepresented among persistent strains. However, none of the genes examined were clearly linked to persistence, with equal representation among persistent and PNP isolates. The genes were also examined for any insertions, deletions or single nucleotide polymorphisms (SNPs) that might distinguish persistent LM strains, but none were identified. Similar results were reported by Muhterem-Uyar et al. [101], who examined the genomes of six persistent strains and five PNP strains isolated from an Austrian cheese processing plant for the presence of genes associated with survival in food-associated environments. Twenty-eight of them were genes associated with biofilm development, including lmo2504, flaA, agrD, agrA, degU, luxS, bapL and agrA (among others). However, these genes were largely present in both persistent and PNP strains.
Overall, WGS studies have failed to identify any consistent genetic differences between persistent and PNP LM strains linked to biofilm production. This would appear to support earlier suggestions that persistence may be due to a failure of cleaning and sanitation procedures to remove LM from harbourage sites in food-associated environments, as opposed to any unique strain properties [17][18]. While environmental factors such as this may significantly contribute to persistence, this is not to say that some strains do not still harbour traits that increase their chances of persisting within food-associated environments [18][71]. Enhanced biofilm production may be just one of these, the importance of which may depend on the strain or environmental conditions or a complex interplay between the two. This may explain why some studies focusing on one trait, such as enhanced biofilm formation or disinfectant tolerance, have observed an association with persistence but not others [71].

7. Conclusions

Overall, it remains unclear as to whether enhanced biofilm formation contributes towards listerial persistence. While numerous phenotypic studies have been carried out to investigate this, the results have been highly conflicting. WGS studies, while limited in number, have also failed to identify any biofilm markers clearly linked to persistence. This may have been due, in part, to authors having relied upon different persistence definitions and/or different experimental protocols. Alternatively, it may be that biofilm formation is just one of several mechanisms that LM uses to persist, the importance of which may depend upon the strain, environmental conditions, or a complex interplay between the two. Clearly, a greater understanding of the mechanisms that LM uses to persist in food-associated environments is needed. However, for this to be achieved, further research is needed.

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Subjects: Food Science & Technology
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Lawrence Finn
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Helen Onyeaka
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Sally O’Neill
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Update Date: 15 Sep 2023
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