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Systems and classical biology approaches unraveled role of
olfactory receptors in progression of kidney fibrosis
Ali Motahharynia1, Shiva Moein1, 2 *, Farnoush Kiyanpour1, Kobra Moradzadeh1, Yousof Gheisari1, 2
1. Regenerative Medicine Research Center, Isfahan University of Medical Sciences,
Isfahan, Iran 2. Department of Genetics and Molecular Biology, Isfahan University of Medical
Sciences, Isfahan, Iran
* Corresponding Author:
Shiva Moein, PhD. Regenerative Medicine Research Center, Isfahan University of Medical Sciences, Isfahan, 8174673461, Iran Tel/Fax: +98-3136687087. Email: [email protected] ORCID: 0000-0002-6019-9504
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Abstract
The olfactory receptors (ORs) which are mainly known as odor-sensors in the olfactory
epithelium are distributed in several non-sensory tissues. Despite the specified role of some
of these receptors in normal physiology of the kidney, little is known about their potential
effect in renal disorders. In this study, using the holistic view of systems biology, it was
determined that ORs are significantly changed during the progression of kidney fibrosis.
For further validation, common differentially expressed ORs resulted from reanalysis of two
time-course microarray datasets were selected for experimental evaluation in a validated
murine model of unilateral ureteral obstruction. Transcriptional analysis demonstrated
considerable changes in the expression pattern of Olfr433, Olfr129, Olfr1393, and Olfr161
during the progression of kidney fibrosis. In conclusion, our results highlight the impact of
systems biology in determination of the underlying mechanisms of chronic diseases and
indicate the importance of time-course approaches to unravel the patterns of gene
expression. The novel ORs proposed in this study could be the subject of further functional
investigations in the kidney.
Key words: Chronic Renal Failure; Systems Biology; Microarray; Gene Network Analysis;
Olfactory Receptor; obstruction-induced renal fibrosis
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Introduction
Olfactory receptors (ORs), belonging to a super-family of G protein-coupled receptors,
are well-recognized for their role in odor-sensation in the olfactory epithelium (OE). This
family of receptors was first discovered by Linda Buck and Richard Axel, leading to a Nobel
prize in 2004 (Buck & Axel, 1991; Watts, 2004). More investigations on ORs determined
that they are not only expressed in the OE but also non-sensory organs (Massberg & Hatt,
2018). The study by Parmentier et al. determined the functionality of these receptors in
sperm chemotaxis during fertilization (Parmentier et al., 1992). Furthermore, it was
demonstrated that these receptors have roles in cytoskeletal remodeling, pulmonary
hyperplasia (An & Liggett, 2018), angiogenesis (Kim et al., 2015), as well as heart
metabolism in the cardiovascular system (Jovancevic et al., 2017). Besides, identification
of the role of these receptors in other parts of the body, such as skin (Busse et al., 2014;
Gelis et al., 2016; Tsai et al., 2017), gastrointestinal tract (Braun, Voland, Kunz, Prinz, &
Gratzl, 2007; Kalbe et al., 2016; C. Wu et al., 2015), and the immune system (Clark,
Nurmukhambetova, Li, Munger, & Lees, 2016; Li et al., 2013) highlights the importance of
further investigations on their function in the body.
One of the tissues, in which the presence and function of ORs is investigated, is the
kidney (Halperin Kuhns et al., 2019; Miyamoto et al., 2016; Peti-Peterdi, Kishore, &
Pluznick, 2016; Pluznick et al., 2009; Rajkumar, Aisenberg, Acres, Protzko, & Pluznick,
2014; Shepard & Pluznick, 2017). Studies using unsupervised high-throughput techniques
have discovered the existence of these receptors in the kidney (Feldmesser et al., 2006;
Flegel, Manteniotis, Osthold, Hatt, & Gisselmann, 2013). Nevertheless, few studies have
specifically focused on their role in renal function. The study by Pluznick et al. determined
the Olfr78 role in blood pressure regulation through interactions with the byproducts of gut
microbiota (Pluznick et al., 2013). Furthermore, Shepard et al. demonstrated that Olfr1393
participates in glucose transportation in both normal and pathological states of the kidney
(Shepard et al., 2016; Shepard, Koepsell, & Pluznick, 2019). Considering the magnitude of
this gene family (around 1000 genes in the mouse and 400 genes in the human) as well as
their role in chemo-sensation, more investigations are needed to uncover the role of other
OR subtypes in kidney function and hemostasis (Halperin Kuhns et al., 2019; Shepard &
Pluznick, 2016).
In order to understand key molecular mechanisms underlying the progression of kidney
fibrosis, a time-course microarray dataset was reanalyzed. Studying the modular structure
of the constructed network determined a subset of ORs with a significant change in
expression. Likewise, this finding was additionally confirmed by analysis of another time-
course dataset with similar traits. Experimental evaluation of common ORs between two
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datasets determined incremental expression patterns during progression of kidney fibrosis.
These results provide an initial clue about the importance of ORs functions in the
progression of kidney fibrosis.
Results
In order to investigate the underlying molecular mechanisms activated during the
progression of chronic kidney disease, two time-course microarray datasets, GSE36496 and
GSE96571 were analyzed. GSE36496 contains transcriptomic data of the UUO and sham-
operated C57BL/6 mice at days 1, 2, 5, and 9 post-operation. The results of this study by
Wu et al. suggest CEBPB and HNF4A signaling pathways as important regulators of kidney
fibrosis (B. Wu & Brooks, 2012). The other dataset, GSE96571 which is also deposited by
Wu et al. comprises the UUO and sham samples at hours 0.5, 1, 3, 5, 7, 12 as well as days
1,3,5, and 7 post-operation. The single-time point analysis of this dataset by Wu et al.
determined overexpression of stress responder genes in the first hours of obstruction besides
nephrotoxic damage-related genes at later time points (B. Wu et al., 2018). This dataset was
used for validation of our findings from the first dataset.
Unsupervised evaluation of microarray dataset determined high quality of the fibrotic
model
The quality assessment of the GSE36496 dataset by PCA demonstrated the separation of
sham and UUO groups from each other. Furthermore, the UUO samples were separated
based on the times of harvest, which determines the model quality (Figure 1a). This result
was also validated by the hierarchical clustering (Figure 1b). The DEGs were determined
using the LIMMA Package of R software, which according to our recent study, is the most
reliable tool for the time-course analysis of microarray data (Moradzadeh, Moein, Nickaeen,
& Gheisari, 2019). A Comparison of the UUO and sham samples determined 2583 DEGs
with an adjusted p-value < 0 .05. The DEGs were used for the construction of a gene
interaction network and further topological analysis (Figure 1c).
ORs constitute a dense module in the interactome map of kidney fibrosis
In order to discover the functional units of the network, module analysis was performed.
Modules are individual units of biological network, which are similar in physical, chemical,
or functional aspects and supposed to have a specific function in the networks (Choobdar et
al., 2019; Lecca & Re, 2015). Assessment of densely connected regions of the network,
based on the clustering coefficient, revealed 36 significant modules. The first and second
modules were mainly related to Nduf and ORs signaling pathways (Figure 1d and e).
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NADH:ubiquinone oxidoreductase supernumerary subunits (NDUF) family of genes are
expressed in the mitochondria and their relation to kidney fibrosis has previously been
demonstrated by Granata et al. (Granata et al., 2009). The relationship between ORs and
progression of chronic renal failure has also been investigated by only one study which
determined the contribution of Olfr1393 in diabetes (Shepard et al., 2019).
For further investigation on the role of ORs in kidney fibrosis, another time-course UUO
dataset was analyzed. LIMMA results determined 3176 DEGs (adjusted p-value < 0.05),
which were further used for construction of a gene interaction network (Figure 1f).
Topological analysis of the constructed network revealed 44 significant modules, of which
ORs-related module obtained the first rank (Figure 1g). For validation of the results of
microarray data analysis, common differentially expressed ORs (Olfr433, Olfr129,
Olfr1393, Olfr161, and Olfr622) between two datasets were selected for in vivo expression
analysis (figure 1h).
Histopathological analysis of the UUO model validated the robustness of the
constructed model
In order to experimentally evaluate the expression of selected ORs, mouse model of
UUO was performed. Both UUO and sham-operated mice were followed over 21 days
(Figure 2a). For validation of the quality of the constructed model, the histopathological
analysis was done. Assessment of the sections revealed significant diffused tubulointerstitial
fibrosis along with glomerular injuries, increased mesangial matrix, and diffused
glomerulosclerosis in UUO-operated mice compared to the sham group over 21 days of
UUO treatment (p-value < 0.05), all of which determined the robustness of constructed
UUO model (Figure 2b and c).
Gene expression patterns demonstrated significant changes in ORs in the fibrotic
kidney
As ORs belong to a highly conserved superfamily which most of them have a similar
sequence, the specificity of designed primers was checked and validated by sanger
sequencing (Supplementary data 1).
The expression of Olfr433, Olfr129, Olfr1393, Olfr161, and Olfr622 was evaluated over
21 days in a time-course manner in both UUO and sham-operated mice (Figure 3). Except
for Olfr1393, other genes demonstrated upregulation over time in comparison to the sham
group. To test whether these changes between the sham and UUO group were significant
during time, a two-way ANOVA analysis was applied. The results of the analysis
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determined significant changes in patterns of expression in the UUO group compared to
sham for all the genes except for Olfr622 (p-value < 0.05).
Considering the patterns of expression over time revealed that Olfr433, Olfr129, Olfr161,
and Olfr622 had a sharp downregulation from day 3 to day 6. Although Olfr433 and Olfr161
expression continued with a smoother augmenting response, Olfr129 and Olfr622 had a
second sharp peak at day 12 followed by a reduction in the consecutive days. Furthermore,
the expression of sham in these four genes over time revealed oscillatory patterns, which is
an initial clue about the inherent rhythmic pattern of OR genes in the kidney.
Discussion
In order to acquire a holistic view of molecular mechanisms of kidney fibrosis, two time-
course microarray datasets were reanalyzed. Gene interaction map evaluation determined
the modular structure of densely connected ORs in both networks. In the next step, to
validate in silico results, the common ORs between two datasets were selected for further
in vivo analysis in a validated model of ureteral obstruction.
Although the relationship between some of the ORs and normal physiology of the kidney
has been determined in recent years (Pluznick et al., 2013; Pluznick et al., 2009; Shepard et
al., 2016), few studies have focused on the role of ORs in pathological states of the kidney.
The study by Shepard et al. has investigated the role of Olfr1393 in diabetes (Shepard et al.,
2019). Additionally, our previous bioinformatics analysis determined a significant change
in the expression of ORs in the rat model of Ischemia-reperfusion injury (Moradzadeh &
Gheisari, 2019). To the best of our knowledge, this is the first study that has focused on the
role of ORs during the progression of kidney fibrosis. Based on in silico and in vivo
investigations, we identified five ORs, which according to our experimental evaluation, four
of them were significantly related to the progression of kidney fibrosis in the mouse model
of UUO. As these ORs have unknown ligands, deorphanizing them and functional
investigations with activation-inhibition approaches would be of the matter of investigations
in the future.
One of the advantages of this study is the time-course design of the models. Time-course
study designs can better demonstrate the dynamism of cellular behavior and also reduces
misinterpretations that may occur in single-point studies (Bar-Joseph, Gitter, & Simon,
2012; Rabieian, Moein, Khanahmad, Mortazavi, & Gheisari, 2018). Unfortunately, due to
cost and difficulty, such study designs are less considered by investigators and most of the
gene expression studies are performed statically (Abedi, Fatehi, Moradzadeh, & Gheisari,
2019). In the current study, both reanalyzed microarray datasets had time-series design and
analyzed with a time-course analysis approach. Likewise, the in vivo model was developed
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in a time-course manner, both in sham and UUO groups. Following sham over time reduces
the misinterpretations caused by single-time point sampling of the control group and leads
to a better perspective from the dynamism of normal function.
Evaluation of Olfr433, Olfr129, Olfr1393, Olfr161, and Olfr622 expression determined
different patterns of gene expression over 21 days. For distinguishing real changes from
noisy fluctuations, we compared the patterns of gene expression in control and treatment
groups based on the parameters that we have discussed in our recent study (Rabieian et al.,
2018). Accordingly, as the magnitude of difference between sham and UUO groups was
significant, and the number of time points that one group was higher or lower than the other
group was consistent, the expression changes seen in ORs expression were considered real
and not noisy fluctuations. Furthermore, evaluations determined rhythmic patterns in ORs
expression in sham groups somehow similar to the rhythmic patterns, which is not far from
the oscillatory function of the kidney (Firsov & Bonny, 2018; Hara et al., 2017). Since these
findings are only an initial clue about the rhythmic expression patterns of OR genes, further
investigations on the relation of ORs expression patterns with kidney function would be of
interest.
Taken together, our in silico and in vivo investigations validate the expression changes
of novel ORs during the progression of kidney fibrosis. Our time-course evaluations
determined rhythmic patterns of ORs expression and highlighted the importance of time-
course study designs in deciphering dynamism of genes behavior over the course of the
disease. However, future studies are required to further investigate these findings. This study
is a good example of the potential capacity of systems biology unsupervised top-down
strategy to unravel the neglected aspects of disease pathogenesis.
Material and Methods
Microarray Data analysis
The GSE36496 microarray dataset deposited by Wu et al. was downloaded from the gene
expression omnibus (GEO) database (Barrett et al., 2013; B. Wu & Brooks, 2012). The
quality of the data was assessed by Principal Component Analysis (PCA) and hierarchical
clustering using ggplot2 and pheatmap package of R software, respectively (Kolde, 2019;
R Core Team, 2019; Wickham, 2016). For determination of the significantly expressed
genes in this time-course dataset, we applied linear models for microarray data (LIMMA),
a package of R software. (Smyth, 2004). Using the multiple comparison method of LIMMA,
the sham and unilateral ureteral obstruction (UUO) groups were compared with each other
at different time points and differentially expressed genes (DEGs) determined by False
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Discovery Rate < 0.05 (Benjamini–Hochberg). The second dataset GSE96571 deposited by
Wu et al. was also analyzed in the same way and DEGs were determined according to the
previously mentioned criteria (B. Wu, Gong, Kennedy, & Brooks, 2018).
Network Construction and topological analysis
The DEGs were used for the construction of a gene-interaction network using Cluepedia
plugin (version 1.5.5) of Cytoscape software (version 3.7.2) (Bindea, Galon, & Mlecnik,
2013; Shannon et al., 2003). The interaction data for activation, binding, inhibition, and
post-translational modification with a confidence rate of 0.8, was retrieved from the search
tool for the retrieval of interacting genes/proteins (STRING) database (STRING-ACTION-
SCORE_v10.0_10090_09.06.2015) (Szklarczyk et al., 2017). Based on the clustering
coefficient parameter, the densely connected sites of the network with a cutoff point of 4
were determined by molecular complex detection (MCODE) plugin (version 1.5.1) as
structural modules (Bader & Hogue, 2003). The gene-interaction network for GSE96571
microarray dataset was also constructed, and the structural modules were investigated using
the same method.
Animal model of Unilateral Ureteral Obstruction
Male C57BL/6 mice aged 6-8 weeks were obtained from Pasteur Institute (Tehran, Iran).
Animal care and experiments were according to the National Institutes of Health’s Guide
for the Care and Use of Laboratory Animals. Ketamine and Xylazine (Alfasan, Woerden,
Netherland) were injected intraperitoneally for anesthesia at the dose of 115 and 11.5 mg/kg,
respectively. During anesthesia and operation, mice were kept on a 37.5 °C plate. After a
mid-abdominal incision, the left ureter was isolated from surrounding tissues, double
ligated, and the incision was sutured. Sham operation was performed with the same
procedure, except for the ligation of the ureter. The mice were harvested 1, 3, 6, 9, 12, 15,
18, and 21 days after surgery. For each time point, two UUO and two sham-operated mice
were allocated. Besides, four untreated mice were used as normal controls. After sacrificing
with cervical dislocation, the left kidney was harvested and coronal sections were prepared.
The anterior part was kept in 3.7% formaldehyde in PBS for histopathological study and the
posterior part was sustained in liquid nitrogen for RNA extraction.
Histopathological Evaluation
The formalin-fixed kidney tissues were paraffin-embedded and 5µm sections were
prepared. Hematoxylin and eosin (H&E) as well as Masson trichrome staining were carried
out and histopathological evaluations were performed in a blinded manner. In random
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cortical fields, the existence of increased mesangial matrix, diffused glomerulosclerosis, and
mesangial cell proliferation was assessed between two experimental groups. Moreover, for
each section, the percentage of cortex area affected by fibrosis that included interstitial
cortical fibrosis, tubular loss with minimal fibrosis, and periglomerular fibrosis was
determined as described previously (Moghadasali et al., 2015).
Statistical Analysis
To compare the significance of histopathological differences between sham and UUO
groups, the two-way ANOVA test was applied using the ‘anova2’ function of MATLAB
software (MathWorks, 2019a).
Gene Expression Assessment
Total RNA of the lower part of the left kidney was extracted using RNX-plus (CinnaGen,
Tehran, Iran) according to the manufacturer’s instruction. Afterward, the concentration of
the extracted RNA was measured by Epoch microplate spectrophotometer (BioTek,
Winooski, Vermont). Since ORs sequence contains only the exon coding region, to
eliminate DNA contamination, the samples were treated with DNase I (Thermo Fisher,
Waltham, Massachusetts). To validate this procedure, mock controls were also employed.
Subsequently, random hexamer primered cDNA synthesis was done using the first-strand
cDNA synthesis kit (YektaTajhiz, Tehran, Iran). Specific primers for the selected ORs, Hprt
and Tfrc were designed using AlleleID software version 6.2 (Supplementary Table 1) (Apte
& Singh, 2007). Real-time quantitative polymerase chain reaction (RT-qPCR) was
performed using RealQ Plus 2x Master Mix Green with high ROXTM (Ampliqon, Odense,
Denmark) by Rotor-gene 6000 cycler (Qiagen, Hilden, Germany). The expression of genes
was normalized by considering Hprt and Tfrc as internal control genes. The results of RT-
qPCR were analyzed using the relative expression software tool (REST) version 1 (Pfaffl,
Horgan, & Dempfle, 2002).
Statistical Analysis
To compare gene expression patterns in UUO and sham groups, the two-way ANOVA
test was applied using the ‘anova2’ function of MATLAB software (MathWorks, 2019a).
The fold changes of the UUO group were considered as response values.
PCR products sequencing
PCR was performed by T100™ Thermal Cycler (Bio-Rad, Hercules, California) using
Taq DNA Polymerase 2x Master Mix RED (Ampliqon, Odense, Denmark), then the PCR
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products were cloned into the PTZ57R vector using TA Cloning™ kit (ThermoFisher,
Waltham, Massachusetts). Cloned products were transformed into competent TOP10 E. coli
by incubating on ice with a subsequent heat-shock at 37°C. Transformed colonies were
cultured on LB-Agar (Sigma-Aldrich, St. Louis, Missouri) plate treated with ampicillin
followed by overnight incubation at 37°C. Afterward, plasmid extraction from bacteria was
performed using Solg™ Plasmid Mini-prep Kit (SolGent, Daejeon, South Korea). Sanger
sequencing of samples was done using both forward and reverse universal M13 (-40)
primers by Bioneer biotech company (Daejeon, South Korea).
Acknowledgments: This study was supported by Isfahan University of Medical Sciences
(grant number: 398439).
Competing interests: The authors declare no competing interests.
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The copyright holder for this preprintthis version posted August 7, 2020. ; https://doi.org/10.1101/2020.07.29.225425doi: bioRxiv preprint
Figure 1. Network analysis of two microarray datasets on mouse model of ureteral obstruction.
PCA analysis and heatmap clustering of GSE36496 dataset demonstrated good quality of samples
regarding treatment and time of harvest (a, b). Gene interaction network created from 2583 DEGs
of GSE36496 dataset (c). The first- (d) and the second-ranked (e) modules resulted from topological
analysis of the network constitute NDUF and OR gene families, respectively. Gene Interaction
network from 3176 DEGs of GSE96571 dataset (f). The top-ranked module from topological
analysis of constructed network is constituted of Olfactory receptors (g). The overlap between
differentially expressed ORs of GSE36496 and GSE96571 datasets (h).
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Rasa1
Mlh1
Pla2g12aKlf15PigylArfgap3VirmaEef1e1AsphCubnOxct2aWtapDctn5Sh3rf1GhrlCysltr1Cacna1hTbc1d1Pidd1Xrcc2IcmtBrd4Akap10Prl2a1Ube2d2aMbtps1
Dpm3Rtn4Prpf31
Nmrk2Ebna1bp2
Esam
Atp5mplDpf3
Usp46Smyd3
Wdr20Tnfsf13
St13Spag9Chd6Nectin4Suds3Ddx42
Sgip1Prdm4
Rspo3Fance
B3gat3Lin9
Atg7Fblim1Actr3
Plce1Whrn
Mvb12a
MecomEtv2Drosha
En2Eif4g2Eif1aDpm2
GalcGabrg2Gabrb3Gabra3
Gja5GfapGcgrUsp15Gas6
GartGalnt4
Dnmt3aDnm1Dmc1Dlg1DldDiaph1Ddit3
Cd55Cd55bDbnlDcx
Cyp1b1Crmp1CraddCplx2Chl1
Ttc30b
Mcm10
Anapc13
Ift172Cltc
Ift22Ift20Orc3
Ttf1
Hoxa1HiraHcfc1H2-DMb2H1f0Grb7
Glycam1
Cd44
Fos
F5
Fcgr2bMyh7
Fbn1
Plxnb2
Erbb2
Ap2s1
Foxo1
Dpm1Dok1
Anapc5
Ep300Esrrb
Esrra
Med27
Med6
Med25
Med10
Med16
Rxra
Med1
Snrnp70
Etf1
Rps20Smg1
Rpl35aUpf2
Rps18 Rpl21
Gspt2
Rplp0
Sh3gl2
Cavin1
Ppp3r1
Ppp3cb
Ppp3ca
Pole2
Pola2
Kitl
Kdr
Lyn
Mcm2
Kcnj9Kcnj6
H2-Ab1 Flt1 Fgf7 Fgf17Fgf10
Nr1d1
Lep
Rarb
Nr2e1
Angptl4
Usp49
Rorb
Esr2
Ndufa7
Ndufab1
Exoc2
Rab14
Ndufa11
Ndufa12Ndufa3Ndufs5
Rala
Aaas
Nup214
Psmf1
Gtf2h2
Tubb3Il6
Psmd5
Psmd9
Psmd12CcnhNelfbEloa
Psma5
Nelfa
Gngt2 Gng3
Il23a
Nupl1
Nup93
Tubb6
Ctdp1
Fgf2
Ssr1
Stk3
Serpinb6c
Senp2
Rps6kb1
Bmpr1b
Gpc2
Myl12b
Serpinb1a
Tctn1
Lpar3
Nxt1
Cops4Cops5
Gabbr2
Tiam2
Gpc6
Akt3Ntrk1
Socs6Gabbr1
Trip4
Kctd10Tmem67
Foxo3
Cops7aCops6
Insr
Il4Cyp4a10Igf1r Cpt2
Gja1Cpt1a
Fgfr2
Sfrp2
Serpinb2
Ngfr
Nfatc2
Mmp9
Serpinb8
Wnt9a
Serpinb6a
Chd3
Tpm1
Wnt1
Thrap3
Cc2d2a
Ctnnb1
Cops2
Cdkn1aCasp3
Cacna1b
Cacna1a
Atf2
Acta2
Agrn
Mta3
Apoe
Arf1
Dync2h1
Cald1
Tmem17
Olfr1206
Olfr1428
Olfr1220
Olfr1157
Olfr263Olfr31
Cav2
Arhgap35
Eif4e2
Vamp3
MafCcl27a
Trp53bp2
Ints5
Cxcl16
Rictor
Vav2
Ccl2
Pard3
Wasf1
Col5a1
Lama3
Ccl24
H2-M10.6
Cxcl14
Ccl11
Casp7
Epha4Cacng2
Cacng5
Sox9
Gata4
Ncam1Slc2a4
Cacna2d1
Bmp2
Gnao1
Olfr1271Olfr39Akt1
Olfr569
Olfr836
Olfr494
Olfr288
Olfr1467
Olfr96
Olfr18
Olfr780
Olfr394
Olfr414
Olfr1496
Olfr1459
Tle4
Mapk7
Pdx1
Wt1
Ccl6
Gli3
Tln2
Socs4
Flna
Nfkb1
Lama4 Fn1
Wwtr1
Kcnc2
Kcnf1
Exoc7
Cacnb1
Cacna1e
Bdnf
Bcl2l1
Braf
Rapgef1
Wwp1
Foxo6Stk4
Psenen
Actr2
Cdt1
Rnf41
Bambi
Prkacb
Dll1Drd4
Hras
Chrm4Cdh1
Cd8a
Porcn
Was Atf6 Tbpl1Mapk8ip3
Lats2
Trpc6Tnfrsf1a
Tlr6
Apaf1
Elk4Fas
Gab1Fgf11
Egr2 Dnmt3bCsk
Csf1Chrd
Fzd10
Csnk1a1
Hdac8
Smarca2
Sar1b
Cd4
Cd14
Brca1
Bmp4
App
Rasa2
Ppp2r2b
Tsc1
Ppp2r3c
Pias1
Cdk6
Cdh4
Cdc25b
Olfr323
Itk
Olfr330 Olfr796
Rela
Smurf1
Ifng
Runx2
Fasl
Olfr874
Olfr63Olfr1393
Olfr1234
Gata6
Hey2
Il10
Il18
Ilk
Gata3
Pax3
Pax2
Ntn1
Nf2
Myf5
Matk
Itgb2
Ret
Rab4a
Pecam1
Prkg2
Pdgfd
Tjp2
Eif5
Tbc1d4
H2-Q2
Pln
Snap23
Ccl12
Ptch1Abcc8
Hmga1
Olfr675
Olfr741
Rps6ka1
Olfr1015
Grk5
Cd247
Eif4ebp1Olfr1256
Olfr700
Olfr1463
Olfr1100 Olfr142 Olfr2 Olfr555Fzd4Olfr355
Fzd2
Olfr493
Olfr926
Olfr161
Olfr738
Olfr95
Olfr305
Olfr668
Olfr488
Olfr282
Il22ra1
Eif5b
Exoc3
Exoc4
Kcng1
Kcnc3
Kcnc1
Kcnh1
Kcna2
LeprNdufv1
Il2ra
Ifngr1
Exoc5
Tubb2a
Tuba3a
Srp68
Tcp1
Ssr4
Psme3Psmc3
Srprb
Psmb5 Nup62 Il5raIl12b
Il11
Sgo2a
Nde1
Clasp1
Nuf2
FynRps27
Zwint
Cenpm
Nup98
Ercc6l
Kif18a
Ahctf1
Stag2
Cct3
Cct6a
Cntf
Csf2rb
Actb
Kif2a
Nudc
Bub3
Pafah1b1
Xpo1
Eif4a2
Eif3a
Cdc7
Ap1m1
Tgs1
Adcy7
Arrb1
Chd9
Ap1s2
Sult2a2
Snrpd1
Polr2f
Pabpn1
Cpsf3
Hnrnph1
Cstf1
Srsf11
Hnrnpa0
Hnrnpr
Snrpb2
Polr2a
Pcbp2
Ppp2r1a
Sfi1
Nek2
Cdk1
Ccp110
Cep76
Cep164
Cdk5rap2
Ywhae
Tubgcp5
Cntrl
Cep63
Taf13
Stat1 Sult2a8
Ttc30a1
Egfr
Mdm2
Ifna13
Ifna4
Klrc1
Raf1
Il1b Htr1d
Ppp2r5e
Jak2
Cyfip1
Nrg1
Tapbp
Bms1
Utp6
Ppp2r5d
Tgfb1
Notch1
Notch4
Pparg
Psen1
Myh6
Myh1
Il2
Ppp2r5cMap2k6Dapp1
Wasf2
Ets2
Ets1
Ezr
Tlr4
Frs2
Tfap4Rrbp1Tfcp2l1Pum1Ak7
RbsnSla2
Nanog
Pax6
Shh
Them4Akap13
Anapc15Sirt4Sv2c
Gorasp1Ifitm7
Myh10Sec24aNkrfMzt1
Snx27Clip3
H2al1m
Smad5
Ezh2
Ccr4
Ccr9
Rapgef4
Pcna
Ccr2
B2m
Atm
Fzd6
Grm6Zzz3
Casp8
Cd59aCalb2C9Bnip3lGlb1Bcl10
Ap2m1
Nos1
Cd9
CebpgCdh9
Dock2Mrpl3Vangl2AmnUbe2nSmarca5Pard6g
Ncor1
Vps37cPrickle1
Fkbp6QarsPrmt6
E2f1
SharpinFancmCog4Trrap
BckdhaBcat2Atp6v0eAtp6v1aAtp5g1Atp5f1Atp5a1
Aplp2ApohArl4a
Atp2a2
Trem2Chrdl1Pik3ap1
Mmp1a
ApcSlc25a5
Actl6b
Slc25a4Ank3Scgb3a2Aebp2
McamGlrx
Adra2aPwp2Adgrv1
Apol7cTmbim6
f
Olfr96Olfr323
Olfr1100Olfr1256
Olfr1234Olfr741
Olfr1220Olfr1393
Olfr569 Olfr668
Olfr142 Olfr700Olfr874
Olfr836
Olfr1496
Olfr493Olfr738
Olfr161
Olfr488
Olfr926
Olfr780
Olfr31
Olfr1428
Olfr263
Olfr414
Olfr95
Olfr1271
Olfr1015
Olfr494Olfr18
Olfr675
Olfr796
Olfr305
Olfr355
Olfr1206
Olfr39
Olfr394
Olfr288 Olfr1157
Olfr1459
Olfr1467
Olfr2
Olfr63
Olfr330
Olfr1463Olfr555
Olfr282
g
ActivationBindingInhibitionPost-Translational Modification
h
Olfr1015Olfr1100
Olfr113
Olfr1157
Olfr1165
Olfr120
Olfr1206
Olfr1220Olfr1234
Olfr1256
Olfr1271
Olfr1284 Olfr1289
Olfr131
Olfr134
Olfr1352
Olfr138
Olfr140
Olfr1412
Olfr142Olfr1428
Olfr144
Olfr1459
Olfr1463
Olfr1467
Olfr1471
Olfr1489
Olfr1496
Olfr1501
Olfr1508Olfr18
Olfr186Olfr197
Olfr2
Olfr22-ps1
Olfr282
Olfr288
Olfr305
Olfr31
Olfr323
Olfr330
Olfr344
Olfr355
Olfr39
Olfr394
Olfr414Olfr42
Olfr488
Olfr493
Olfr494Olfr523
Olfr551
Olfr555
Olfr569 Olfr619
Olfr780
Olfr796
Olfr811Olfr836
Olfr862
Olfr629
Olfr63
Olfr649Olfr668
Olfr675
Olfr700
Olfr738
Olfr741
Olfr746Olfr768
Olfr874 Olfr926
Olfr95
Olfr957
Olfr96
Olfr960
Olfr960
Olfr996
GSE96571n = 82
Olfr1030
Olfr1056
Olfr1099
Olfr114
Olfr1260 Olfr1270
Olfr1276Olfr1307 Olfr1350
Olfr1371
Olfr1406
Olfr1447
Olfr1469
Olfr187
Olfr24Olfr313
Olfr373 Olfr374Olfr399
Olfr415
Olfr43
Olfr447
Olfr478Olfr497
Olfr584
Olfr608 Olfr69
Olfr906
GSE36496 n = 33
b
PC1
-10
-20
20-20
10
PC2
SamplesUUO-day 1
UUO-day 2
UUO-day 5
UUO-day 9Sham-day 1to day 9
Olfr129Olfr161
Olfr622
Olfr433Olfr1393
n = 5 Common ORs
2 1 0 -1
.CC-BY-NC-ND 4.0 International licensemade available under a(which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is
The copyright holder for this preprintthis version posted August 7, 2020. ; https://doi.org/10.1101/2020.07.29.225425doi: bioRxiv preprint
Figure 2. Histopathologic evaluation of UUO-operated mice over 21 days. The scheme of
experimental design (a). Trichrome and H&E-stained renal sections in normal, sham (day-21), and
UUO operated mice at days 1, 3, 6, 9, 12, 15, 18, and 21 post-surgery. Yellow, red, and black arrows
stand for increased mesangial matrix, mesangial cell proliferation, and diffuse glomerulosclerosis,
respectively (b). The percentages of glomeruli with increased mesangial matrix (p-value = 0) as well
as cortical fibrosis (p-value = 3.25077e-10) for sham and UUO-operated mice. Data are mean ±
SEM (c).
b
2 cm0 1 2 cm0 1 2 cm0 1 2 cm0 1 2 cm0 1
2 cm0 1 2 cm0 1 2 cm0 1 2 cm0 1 2 cm0 1
��ɤT ��ɤT ��ɤT ��ɤT
��ɤT ��ɤT ��ɤT ��ɤT ��ɤT
��ɤT ��ɤT ��ɤT
��ɤT ��ɤT ��ɤT ��ɤT ��ɤT
��ɤT
��ɤT ��ɤT
Gro
ss
Normal UUO day-1
UUO day-9 UUO day-12 UUO day-15 UUO day-18 UUO day-21
Sham day-21
Tric
hrom
eTr
ichr
ome
Gro
ssH
&EH
&E
a
�
��
��
��
��
��
��
� � � � � � � � ��������������������������
���������������
� ���� �
��������
������ ����� ����������
Perc
ent o
f Affe
cted
Glo
mer
uli
�����������������
� � � � � � � � ��������������������������
��������������
���������
�������������
���
� ��
Perc
ent o
f Are
a
Cortical Fibrosis
Days Days
UUOSham
Days
0 3 6 9 12 15 18 211
Increased Mesangial Matrix
c
UUO day-6UUO day-3
Sham: n = 2 UUO: n = 2
.CC-BY-NC-ND 4.0 International licensemade available under a(which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is
The copyright holder for this preprintthis version posted August 7, 2020. ; https://doi.org/10.1101/2020.07.29.225425doi: bioRxiv preprint
Figure 3. Expression level of common ORs between two datasets in mouse mode of UUO over
21 days. Statistical analysis (two-way ANOVA) determined significant changes between UUO and
sham group for Olfr433, Olfr129, Olfr1393, and Olfr161 (p-value < 0.05).
Fold
Cha
nge
Days
Olfr161
3 6 9 12 15 18 210
10
15
20
25
0
5
Olfr433
3 6 9 12 15 18 210
1
2
3
4
0
5
6
7
8
Olfr622
3 6 9 12 15 18 210
10
15
20
25
0
5
Olfr1393
3 6 9 12 15 18 210
1.0
1.5
2
0.5
Olfr129UUOSham
3 6 9 12 15 18 210
10
15
20
0
5
Gene NameTreatment
p-value (main effect)
Olfr433 0 *
Olfr129 0.0002 *
Olfr1393 0 *
Olfr161 0.0007 *
Olfr622 0.0822
.CC-BY-NC-ND 4.0 International licensemade available under a(which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is
The copyright holder for this preprintthis version posted August 7, 2020. ; https://doi.org/10.1101/2020.07.29.225425doi: bioRxiv preprint
Supplementary Table 1
Supplementary Data 1: Sanger sequencing results
Gene Gene ID Forward primer Reverse primer
Primers list
258324
258859
259087
258712
258463
Size(bp)
84
95
117
Olfr433
Olfr622
Olfr1393
Olfr161
Olfr129 GGTATAACTGAGTGCTGCCTACTG CCCACGATTCATTCGGGTTGTAT
GTCTTGGGAAACCTGCTCATCAT AGTGGTGGAGGAGAAGCATACAT
CCTGGCTTGGAGAATGTTCACTGT ATAGGCTGGTGGAGACTTGGCTC
CTCCGACCTCTTGCCTTCC CCTGAATCTGCCTGAACCAA
CGTCCACTGCACTATACT GTTCAAGAAGCCTCCTACC
96
125
Hprt
Tfrc
CGTCGTGATTAGCGATGATG AGTCTTTCAGTCCTGTCCATAA
TGCATTGCGGACTGTAGAG CCCACCAAACAAGTTAGAGAAT
126
97
15452
22042
.CC-BY-NC-ND 4.0 International licensemade available under a(which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is
The copyright holder for this preprintthis version posted August 7, 2020. ; https://doi.org/10.1101/2020.07.29.225425doi: bioRxiv preprint