Differential expression and regulation of HSP70 gene during growth phase in ruminants in response to heat stress

Scientific Reports volume 12, Article number: 18310 (2022) Cite this article

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Heat shock proteins regulate the physiological mechanism of heat stress adaptation at cellular level. The present investigation was carried out to analyse the HSP70 gene regulation in various growth stage in ruminants in peripheral blood mononuclear cells (PBMCs). The relationship between HSP gene expression and thermotolerance in age-specific manner in ruminants has not been analysed. Therefore m-RNA HSP70 expression level was examined in different age groups of Jamunpari goat during hot climatic conditions. The experiment was carried out in 32 animals of Jamunapari goat belonging to the age groups of 3-months, 9-months, 12-months, and adults (2–3 year). Total RNA was isolated from peripheral blood mononuclear cells. The physiological response such as rectal temperature (RT), respiration rate (RR) and heart rate (HR) was used as indicator to heat stress. Temperature Humidity Index (THI) was used as an indicator of severity of environmental stress. The THI range varied from 82.00–92.08 during experimental period. The m-RNA HSP70 expression level at 9-month age of animals was up-regulated and significantly higher than other age groups. It was observed that the level of HSP70 transcripts in PBMCs was highest at 9-month age group, and age-related decline in HSP70 expression was observed in adult age. Based on the physiological response, the contrasting heat-stress phenotypes were recognised as heat stress susceptible (HSS) and heat stress tolerant (HST) individuals and the expression of m-RNA HSP70 was analysed at different ages in response to chronic heat stress. The differential mRNA expression of HSS individuals at 3 and 9-month of age showed the highest fold expression than HST. Age and phenotype had significant effect (p < 0.01) on the crossing point (CP) value. The m-RNA HSP70 gene expression in different age groups was correlated with heat stress tolerance and this could be used as biomarker for breeders to analyse the HSP response in -vivo in ruminants.

Thermal acclimation and thermal adaptation are associated with increased basal level of heat shock proteins (HSPs)1,2. HSPs are activated in response to various environmental and other stressors. It has been observed that the skin epithelium releases heat shock protein to mobilize the thermal shock in response to heat stress. The expression of inducible HSP70 is increased several-fold as skin temperature approaches the upper limit of the thermo-neutral zone of ruminants. The heat stress regulation pathway protects the proteome of all the cells in response to elevated temperatures, and oxidative damage3,4. At the cellular level, heat and other metabolic stressors induce the HSPs and increase gene expression due to the activation of heat shock transcription factors (HSFs)5,6,7. HSPs interact with other cellular proteins during stress conditions and maintain cellular homeostasis8. The individual animals respond to physiological and environmental stress by activating different stress regulation pathways which protect the core biological processes by promoting protein folding. HSPs are released intracellularly and extracellularly in an inducible form in response to stress. Cellular tolerance to heat stress is regulated by HSPs and HSP70 can be an indicator of stress in cells9. HSPs are responsible for maintaining the balance between survival and an effective immune system in the organism in order to acclimatize the stress10.

The ability to withstand heat stress is an important component of adult fitness. Cells release heat shock proteins in response to metabolic or environmental stresses8. It has been observed that there was a decline in the heat-induced expression of HSP 70 m-RNA in primary fibroblast of rat with ageing11. Similarly, the decline in the heat-induced expression of HSP70 in human diploid fibroblasts as a function of cell passage (in vitro ageing) has been reported. The age-dependent thermoregulation at physiological level has been observed in human as well as experimental animals12. It has been also shown that HSP regulates stress tolerance at tissue level in vivo13. Therefore, the present study was carried out to analyse the age-related m-RNA HSP70 expression in response to heat stress in ruminants. The study was carried out in vivo to observe the mechanism of thermoregulation in animals up to 1 year of age and adult individuals during heat stress period. HSP 70 m-RNA expression was analysed during growth phase of ruminants till maturity age and in adult animals in response to heat stress. The regulation of HSP70 expression with respect to the aging process in vivo has not been carried out in ruminants. The differential expression of HSP70 protein is still not analyzed and understood in ruminants, therefore the present study analyses the expression pattern of heat shock protein at different ages during heat stress period.

The environmental temperature during the experimental period varied from 40 to 49.5 °C. Temperature-humidity index (THI) varied from 82.0–92.08 during hot period. The physiological response such as rectal temperature (RT), respiration rate (RR) and heart rate (HR) exhibited wide variability in animals during heat stress period and are presented in Table 1. The range of variability in RT, RR and HR was 38.1 to 39.9 °C, 24 to 84 breaths/min, and 100 to 160 beats/min during the hot period, respectively (Table 1). The classification of phenotypic differences at the population level was based on the earlier presented data. On the basis of the distribution of RR and HR, individuals having a RR of ≤ 34 (breaths/min) and a HR of ≤ 108 (beats/min) were recognized as heat stress-tolerant phenotype (HST). However, RR of ≥ 50 (breaths/min) and a HR of ≥ 130 (beats/min) were recognized as heat stress-susceptible phenotype (HSS). The mean variation of physiological responses during extreme heat stress period with respect to stress susceptible phenotype is presented in Table 2 and Supplementary Fig. 1. The mean of RT, RR and HR showed significant variation within heat stress susceptible and tolerant phenotype. The mean of RT, RR and HR of heat susceptible phenotype were 39.277 °C, 70.923breaths/min and 145.538 beats/min, respectively. The mean of heat stress susceptible phenotype and tolerant differenced by 0.859 °C in RT, 39.650 breaths/min in RR and 37.083 beats/min in HR, respectively. The mean variation of physiological responses in different ages with respect to HSS and HST stress phenotype are presented in Table 3. The RT, RR and HR were significantly (P < 0.01) different between HSS and HST phenotypes at different age groups. Therefore, RT, RR, and HR were significantly (P < 0.01) affected by age of the animals.

The relative m-RNA expression level of HSP70 was analysed in the different age groups of Jamunapari goats during hot period. The m-RNA expression pattern of HSP70 was analysed at 3, 9, 12 months of age and in adults (2–3 years) with respect to stress phenotypes. Glyceraldehyde 3-phosphate dehydrogenase (GAPDH) and beta actin (β-actin) genes were used as internal control. Quality of amplified product by using RT-PCR (Supplementary Fig. 2), amplification curve & melting peak are provided in Supplementary Fig. 3A and Fig. 3B. The relative m-RNA expression pattern of HSP70 gene in 3, 9, 12 months and adults ages showed 5.70, 23.90, 4.08 and 1.51 up-regulation compared to adult control (heat stress-susceptible) (Table 4 and Fig. 1). The m-RNA expression was significantly higher at 9-months of age of animals as compared to other age groups. The expression of HSP70 gene at 9-month age of the Jamunapari goats was 23.9-fold higher in comparison to calibrator (control group). In addition, the 9 months of age showed a 5.86-fold and 15.83-fold higher m-RNA level than the 12-month of age and adult, respectively (Table 4 and Fig. 1).

Relative mRNA expression (fold change) of HSP70 gene in different age groups of Jamunapari goat. 3 M, 3-month age of animal; 9 M, 9-month age of animal; 12 M, 12-month age of animal; adult, 2–3 year age of animals. The crossing point (Cp) readings for each unknown sample were then used to calculate the amount of either the target or housekeeping gene using the second derivative maximum method with the Light cycler 480 analysis software version 1.5 (Roche Applied Science, Indianapolis, IL, USA). GADPH and β-actin were used to normalize gene expression. The susceptible individual was used as a positive calibrator to obtain normalized gene expression.

However, the differential m-RNA expression between contrasting heat stress susceptible and tolerant phenotypes indicated that HSS individuals at 3, 9, 12 months and adult ages exhibited 3.57, 32.34, 3.70 and 0.54-fold higher expression than control. Similarly, HST individuals at 3, 9, 12 months and adult exhibited 3.20, 17.66, 4.50 and 4.41- fold higher expression than control. The m-RNA expression of HSP70 gene based on heat stress phenotypes were 3.57 and 32.34- fold higher in heat stress- susceptible phenotype at 3 and 9-month age of animals, respectively. Similarly, the heat stress-tolerant phenotype exhibited 3.20 and 17.66-fold lower expression at 3 and 9-month age during the hot period (Table 5 and Fig. 2).

Relative mRNA expression (Fold change) of HSP70 gene at different age groups of Jamunapari goat with respect to HST and HSS phenotype. 3 M-HST, 3-Month age of animal- Heat stress tolerant phenotype; 3 M-HSS, 3-Month age of animal-Heat stress susceptible phenotype; 9 M-HST, 9-Month age of animal-Heat stress tolerant phenotype; 9 M-HSS, 9-Month age of animal-Heat stress susceptible phenotype; 12 M-HST, 12-Month age of animal-Heat stress tolerant phenotype; 12 M-HSS, 12-Month age of animal-Heat stress susceptible phenotype; Adult-HST, Adult (2–3 year) age of animal- Heat stress tolerant phenotype; Adult-HSS, Adult 92–3 year) age of animal- Heat stress susceptible phenotype. The crossing point (Cp) readings for each unknown sample were then used to calculate the amount of either the target or housekeeping gene using the second derivative maximum method with the Light cycler 480 analysis software version 1.5 (Roche Applied Science, Indianapolis, IL, USA). GADPH and β-actin were used to normalize gene expression. The susceptible individual was used as a positive calibrator to obtain normalized gene expression.

The least squares mean of crossing point (CP) value were analysed in the different age groups of Jamunapari goats. Table 6 shows the effect of season of birth, birth type, sex, age, phenotype and parity. HSS phenotype showed significantly higher (p < 0.01) CP than HST phenotype. Sex by phenotype interaction showed a significant difference (p < 0.01) on CP (Table 7). However, there was no significant difference observed in the season of birth, birth type and sex on CP. The ANOVA table revealed that age, phenotype, and parity had significant effect (p < 0.01) on CP (Table 8). Similarly, season of birth, birth type, age and parity had significant (p < 0.01) effect on body weight.

HSP 70 plays a protective role during heat stress and also regulates normal cell growth and proliferation. HSPs protect cells against apoptosis mediated through oxidative stress24. Cellular thermal stress tolerance is regulated by HSPs25,26,27 and HSP70 is considered as a marker for heat stress tolerance in different species28,29. The age-related heat-stress regulation and thermal-tolerance in hot environmental conditions in livestock have not been well understood. The m-RNA expression pattern of HSP70 showed that HSP70 gene expression was significantly higher at 9-month age as compared to 12 months and adult age in Jamunapari goats. The expression of m-RNA HSP70 was about 5.85 and 15.75 folds higher as compared to 12-months and adult age. The expression level of m-RNA HSP70 gene in 3, 9, 12-months and adults ages showed 5.70, 23.90, 4.082 and 1.51 up-regulation compared to adult control (heat stress- susceptible individuals). Growth and development in goats occur in a similar way compared to other ruminants and mammals. Growth is a function of the life cycle of each animal that begins with embryo fertilization and ends with death. Cells are the basic unit of growth and development. Growth and developmental rates are governed by both genetic potential and environmental factors. The foetal phase of growth is from differentiation to parturition. The factors that affect post-natal growth and development are genetic potential and the influence of environment and nutrition to attain the genetic make-up. The goats attain maturity during 9 months of age and it is the age for maturation of the immune system. As it is evident the maternal immunity affects the individual up to 6 months of age. Therefore 9-month is the age the age for selecting individual for growth and other economic traits. Sexual maturity is the age at which mammals can reproduce and attains development in every phase. Rodent family attains sexual maturity at the age of 1–2-month, Dog and Bovidae family reach sexual maturity at about 1 year of age and primate including human being reaches maturity at the age of 23 years30. Growth and development are determined by single and interactive multiple factors of the external and internal environments. It is required to understand the growth and development in goats and the factors that affect these processes as it determines the efficiency of production and product quality. The rate and efficiency of growth and the subsequent effects on product quality need to be manipulated from conception to consumption for better human health and effective resource management31. Exploration of expression patterns and its relevance in survival, and adaptation holds a great promise in livestock improvement and breeding regimens.

Similarly, the m-RNA expression of HSP70 at 3, 9, 12 and adults were 3.57, 32.34, 3.70 and 0.54-fold in HSS phenotype and 3.20, 17.66, 4.50 and 4.41- fold in HST phenotype, respectively. The differential m-RNA expression indicated that the HSS individuals at 3 and 9 months of age had highest fold expression than HST. Similarly, m-RNA gene expression profile study for HSP60 and HSP70 has also been reported in Saanen goats32. In addition, a significantly positive correlation of HSP70 and 60 was observed between environmental condition and physiological parameters in dairy goats33. The seasonal profile of HSP60 and 70 concentrations have been reported to be less in winter season as compared to summer and found a positive and significant correlation between HSP concentration and physiological data in goats34. In this study, the animals of 1–2-year-old (youngest group) showed highest increase in HSP expression as compared 3–4 year and 5–6-year-old individuals. Moreover, a seasonal variation was also recorded with HSP70 level was found with elevated HSP60 and HSP70 expression during the summer as compared to other seasons. These findings are also consistent with smaller mammals, especially rodents, such as male Wistar rats11. It has been established that there was a decline in the heat-induced expression of HSP70 m-RNA in primary fibroblast of rat with ageing 11. Also, HSP70 expression was 40–50 percent lower in adult rats (22–28 months) than in young rats (4–7 months) when exposed to 42.5 °C for 30 min35. In the present study, physiological responses indicated significant variation within heat stress- susceptible and tolerant phenotype. Similarly, HSP70 on serum level was associated with some physiological parameters in dairy goats under south turkey conditions 36. In Drosophila melanogaster age-dependent and sex-dependent expression of HSP70, HSP22, and HSF1 was studied and observed that HSP70 expression declines throughout the life-span. HSP induction is important in maintaining homeostasis, then a deficit in its expression could contribute to an age-related decrease in stress tolerance. Alternations in Hypothalamus-Pituitary Axis (HPA) function are known to occur with age37,38,39,40,41,42,43. Although it has been reported that there is no age-related deficit in eliciting an adrenocortical response to acute stress, it has been suggested that reduced HPA activity occurs in aged animals after repeated stress exposure44. Thus, the decline in HSP70 expression with age could reflect a change in HPA activity rather than an intrinsic alternation in HSP70 gene regulation. HSP70 appears to play a protective role to cope up in these stress conditions and may function to protect cells against subsequent challenges13,45,46.

The regulation of HSP70 gene expression is complex. Similarly, the decline in the heat-induced expression of HSP70 in human diploid fibroblasts as a function of cell passage (in vitro ageing). The transcriptional mechanism of HSP70 varies in relation to age and it may be due to age-associated alteration in the signaling mechanism of heat shock response47. The age-dependent thermoregulation at physiological level has been observed in humans as well as experimental animals12. In a preliminary study using human peripheral blood mononuclear cells, a 30% impedance of heat-induced HSP70-encoding gene transcription was observed in aged persons relative to young individuals48. In human, serum Hsp70 was positively correlated with age within 30 years and negatively correlated with Hsp70 level in lymphocyte after 40 years49. The present results could improve our understanding of the mechanism of thermotolerance in the ruminants during growth phase and factors affecting growth and economic traits. Therefore, it is necessary to analyse the correlation between m-RNA expression and protein expression in different age groups during heat stress period. Similarly, it is also required to evaluate serum protein of the animal and determine heat shock balance index (eHsp70/ iHsp70) in particular population for better adaptability and maintain productivity in the changing climatic variation.

The m-RNA HSP70 expression level at 9-month age of animals was up-regulated than other age groups. HSP70 m-RNA levels were higher in HST individuals at 3 and 9-months of age of Jamunapari goat. The age of 9 months is the age for selecting individuals for growth and other economic traits. The m-RNA HSP70 gene expression in different age groups was correlated with heat stress tolerance and this could be used as biomarker for breeders to analyse the HSP response in vivo in ruminants.

The experiment was carried out at the Jamunapari breeding unit at ICAR-Central Institute for Research on Goats (ICAR-CIRG), Makhdoom, Mathura, Uttar Pradesh, India. Jamunapari is one of the most milk-producing and large sized goat breeds in India, distributed in the semi-arid region of Uttar Pradesh14. The climate in the study area was semi-arid, with average temperature of 45 °C and precipitation of ~ 400 mm during the experimental period. Animals (goats) were housed separately based on their gender, age, health and physiological status, and were managed under semi-intensive rearing system with 6–7 h grazing time. Appropriate animal feed, including dry fodder and green fodder, were provided based as per physiological and production status. The body condition score was adequate and uniform for all the animals. At regular intervals, the flock was vaccinated and dewormed.

The investigation has been carried out in Jamunapari goat breed of semi-arid region of India, and categorised into four age groups, as shown in Table 9. In growing kids, physiological responses such as respiration rate (RR), heart rate (HR), and rectal temperature (RT) were recorded as indicators of heat stress. Physiological responses were recorded during the highest temperature of the day ranging from 13.30 to 14.30 h. The physiological response at various ages was recorded three times over 8–10-day period (May–June). A digital clinical thermometer was used to measure rectal temperature (accuracy ± 0.1 °C). RR and HR were measured by auscultation as described earlier 15.

The data on meteorological variables (relative humidity (%), sunshine (h), rainfall (mm), dry bulb temperature (DBT) and wet bulb temperature (WBT) and temperature) were recorded at ICAR- Central Institute for Research on Goats, Makhdoom, Farah, Mathura. The THI was calculated from dry and wet bulb air temperatures for a particular day according to the following formula:

where, dry and wet bulbs are temperature in degrees Celsius. The collection and recording of physiological responses with respect to highest THI during the peak heat stress period varied from 82.00–92.08. THI could be used to predict thermal climatic conditions16. Extreme heat stress period, the average of environmental temperature ranged from 40.0–49.5 °C and RH ranged from 14.33–51.0 and animals were exposed to radiation for 4–5 h for 28 days.

To distinguish the two contrasting phenotypes, the distribution of high respiration rate and heart rate and low respiration rate and heart rate was used. In goats, respiration activity and heart rate serve as indicators of heat stress tolerance, and individuals are classified as heat stress-tolerant or susceptible. The phenotypic classification of heat stress in goats has been extensively described at the population level elsewhere 17,18,19,20,21.

About 3–4 ml fresh blood samples from each animal was collected aseptically in heparinized vacutainer tubes (BD Biosciences, Franklin Lakes, NJ, USA) through jugular vein puncture and immediately transported under refrigeration for the isolation of RNA. The ethical guidelines were followed during blood collection. The blood samples were diluted with PBS, pH 7.4 (1:2) and subsequently layered upon volume of HiSep LSM-1077(Hi-Media). The precautions were taken to produce a clean interface between two layers of blood and HiSep media. Samples were centrifuged at 3000 rpm at 4 °C for 30 min and the white opaque mononuclear fraction of cells from the interface was aspirated into fresh micro-centrifuge tubes (MCT). Diethyl Pyrocarbonate (DEPC)-Phosphate Buffer Saline (DPBS) was added to resuspend the caprine PBMCs and further centrifuged for washing at 5000 rpm for 5 min. Finally, the obtained cell pellet was transferred to a sterile DEPC treated micro-centrifuge tube.

Total RNA was isolated from PBMCs using TRIzol (Invitrogen) method. One milliliter of TRIzol was re-suspended to dissolve the PBMCs pellet. Subsequently, RNA isolation method was followed according to Rout and Kaushik et al. 17,20. The quality and quantity of RNA were assessed by Biophotometer (Eppendorf) by using OD260 for concentration and the ratios 260/280 and 260/230 to assess the purity of the sample. The RNA integrity was tested on a 1.4% agarose gel, and samples that passed the purity test (A280 ~ 1.9) were used for cDNA synthesis. 1 µg of RNA was used for the preparation of cDNA by transcriptor first strand cDNA synthesis kit (Roche) following by manufacturer's protocol, and the cDNA thus obtained was stored at − 70 °C for future use. DNase treatment was used to remove DNA contamination from RNA, as previously described17. Real Time PCR was analysis was carried out in Light Cycler 480 (Roche Applied Science, Indianapolis, IL, USA) using SYBR Green® master mix (Roche) as per manufacturer instructions. The reaction was set up in 96 well plate and each well contained 2 μL of cDNA sample, 10 μL of SYBR green I master mix (Roche Applied Science, Indianapolis, IL, USA), 1 μL (20 pmol) of the specific primers and nuclease-free water to make final volume of 20 μL. The primers of HSP70 gene (5′ TCATCGGAGATGCAGCCAAGAA-3′ and R-5′ AGATCTCCTCGGGGAAGAAGGT 3′) were used with an annealing temperature of 61 °C to amplify a 210 bp fragment. GAPDH (F-5′ GTGATGCTGGTGCTGAGTAC3′ and R-5′ GTAGAAGAGTGAGTGTCGC-3′) and β-Actin (F-5′ TGCCCT GAGGCTCTCTTCCA′ and R- 5′ TGCGGATGTCGACGTCACA-3) were used to normalise the gene expression of the HSP70 gene.

The thermal profile was standardized as initial denaturation at 94 °C for 10 min, followed by 45 cycles, denaturation at 94 °C for 10 s, annealing at 61 °C for 15 s, and extension at 72 °C for 20 s. The tests were carried out in duplicate. PCR products were subjected to melting curve analysis in the Light cycler 480 and subsequently 3% agarose gel electrophoresis to confirm amplification specificity and amplicon size.

Relative quantification was carried out to measure fold-change in expression levels of the target genes using the 2–∆∆Ct method and by E-method22. The advance relative quantification was carried out using the second derivative maximum method with the Light Cycler 480 analysis software version 1.5 (Roche Applied Science, Indianapolis, IL, USA). All analyses were performed on mean Cp value, which were calculated from two sample replicates used in real-time PCR.

The expression and physiological responses within stress phenotypes were analysed. For fitting constants, mixed model least-squares means analysis was used to determine the statistically significant effect of various genetic and non-genetic factors23. The model includes the fixed effect of season of birth (2 levels), birth type (2 levels), sex (2 levels), age (4 levels), phenotype (2 levels), parity (4 levels) and interaction effect. The crossing point (CP) of HSP70 gene and body weight of Jamunapari goat was fitted as a linear covariate in the model.

Model 1:

where, Yijklmn is the observation of ith season of birth, jth birth type, kth sex, lth age group, mth phenotype, nth parity, µ = population of mean, Season of birth = fixed effect of ith season of birth (February–March and October–November = 1 and 2), Birth typej = fixed effect of jth birth type (Single and Twins, J = 1 and 2), Sexk = fixed effect of kth sex (Male and Female, K = 1 and 2), Agel = fixed effect of lth age group (3-month, 9-month, 12-month and adults l = 1, 2, 3 and 4), Phenotypem = fixed effect of mth phenotype (Heat stress-tolerant and Heat stress-susceptible, m = 1 and 2), Parityn = fixed effect of nth parity (Parity = 1 to 4), Eijklmn = random residual error associated with observation with mean 0 & variance 1.

All sample collection was conducted in accordance with institutional practice and the study was approved by Institutional animal ethics committee (IAEC/CIRG/18–19). Norms of arrive were followed during the ethical approval process.

The datasets used and/or analysed during the current study available from the corresponding author on reasonable request.

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The authors acknowledge the Director, ICAR-Central Institute for Research on Goats, Makhdoom, Farah, Mathura and Uttar Pradesh, India for providing facilities to carry out the research work.

Department of Biotechnology, GLA University, 17Km Stone, NH-2, Mathura-Delhi Road, Chaumuhan, Mathura, 281406, U.P, India

Rakesh Kaushik & Anjana Goel

Animal Genetics and Breeding Division, ICAR-Central Institute for Research on Goats, Makhdoom, Farah, Mathura, 281122, U.P, India

Rakesh Kaushik & P. K. Rout

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R.K.: Sample collection, laboratory experiement, qRT-PCR experiment, gene expression analysis, software used for data analysis and manuscript writing—reviewing and editing. A.G.; manuscript writing—reviewing and editing, P.K.R.: Concept development, experimental design, analysis and manuscript writing—original draft, reviewing and editing.

Correspondence to Rakesh Kaushik or P. K. Rout.

The authors declare no competing interests.

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Kaushik, R., Goel, A. & Rout, P.K. Differential expression and regulation of HSP70 gene during growth phase in ruminants in response to heat stress. Sci Rep 12, 18310 (2022). https://doi.org/10.1038/s41598-022-22728-6

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Received: 18 April 2022

Accepted: 18 October 2022

Published: 31 October 2022

DOI: https://doi.org/10.1038/s41598-022-22728-6

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