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Association of ChREBP Expression and Polymorphism with Serum Biochemical Indices in Cherry Valley Duck.

Byline: Hua-Lun Luo, Yi-Yu Zhang, Yuan-Yu Qin and Lei Wu

Keywords: Duck, ChREBP gene, Gene expression, Single nucleotide polymorphism (SNP), Serum biochemical indices.

Introduction

ChREBP, carbohydrate-responsive element-binding protein also known as MLX-interacting protein-like (MLXIPL), derives from the protein's interaction with carbohydrate response element sequences of DNA. It is a basic helix 1oop helix/leucine zipper (bHLH/LZ) protein of the Myc/Max/Mad superfamily, widely expressed on multiple metabolic tissues in mammals, especially high expressed in liver, small intestine, skeletal muscle, adipose tissue, brain, spleen and kidney. ChREBP as a determinant transcriptional factor, forms a heterodimeric complex and binds and activates, in a glucose-dependent manner, regulated lipid synthesis in liver at the transcriptional level by binding to conservative sequences carbohydrate response element (ChoRE) in promoter of glycolysis and triglyceride synthesis genes, including fatty acid synthase (FAS), sterol regulatory element-binding protein 1 (SREBP1), acetyl CoA carboxylase (ACC) and L-type pyruvate kinase (L-PK) (Ma et al., 2006; Liu et al., 2018).

ChREBP is translocated to the nucleus and binds to DNA after dephosphorylation of a p-Ser and a p-Thr residue by PP2A, which itself is activated by Xylulose-5-phosphate (Xu5p). Hepatic ChREBP is critically responsive to fructose intake and that fructose-mediated activation of ChREBP may link to hypertriglyceridemia, hepatic steatosis, and both hepatic and peripheral insulin resistance. Using tissue-specific ChREBP deletion method has shown that hepatic ChREBP is not required for fructose tolerance. Intestine-specific ChREBP-KO mice recapitulate the fructose-mediated toxicity observed in global ChREBP-KO mice and intestinal ChREBP is essential for fructose tolerance. However, liver-specific ChREBP-KO mice tolerate HFrD without evidence of significant liver inflammation. ChREBP gene is deleted in Williams-Beuren syndrome which a multisystem developmental disorder caused by the deletion of contiguous genes at chromosome 7q11.23.

Hepatic ChREBP is protective in regards to hepatic insulin sensitivity and whole body glucose homeostasis. Hepatic ChREBP action can influence other peripheral tissues and is likely essential in coordinating the body's response to different feeding states (Jois et al., 2017). Based on the role of ChREBP in regulation of glycolysis and lipid metabolism. ChREBP gene may affect the economic traits of animals. However, few studies have been reported on expression and genetic variation of the ChREBP gene in birds. The properties and functions of ChREBP gene are still unknown in poultry. Therefore, in this study, we sought to examine the association of the mRNA expression levels and polymorphisms of ChREBP with duck serum biochemical indices which may suggest an insight into the genetic mechanism of economic traits and be helpful for improving production performance in duck breeding.

Materials and methods

Animal, sample preparation and data collections

A introduced duck variety of Cherry Valley ducks (321 females) were hatched on the same day. All of individuals were raised in a semi-open house and fed commercial corn-soybean diets based on the NRC requirements and subjected to same management environment in the experimental farm of Guizhou University, Guiyang, Guizhou, P.R. China. Blood samples (1.5mL) were obtained from the wing vein of each individual at 70 days of age, and then the serum was isolated in centrifuge tube. After blood was collected, all of ducks were euthanized that the specific implementation plan was taken all experimental ducks placed in an operating room filled with a mixture of 90% argon and 10% nitrogen, the ducks were quickly bled and dissected after they were unconscious.

Sixteen kinds of tissues samples were collected from liver, heart, spleen, kidney, lung, cerebellum, cerebrum, proventriculus, gizzard, intestine, large intestine, abdominal fat, subcutaneous fat, pituitary, hypothalamus, and breast muscle, and frozen in liquid nitrogen until being used.

Serum biochemical indexes, including triglyceride (TG), total cholesterol (TCHO), high density lipoprotein cholesterol (HDL-C), low density lipoprotein cholesterol (LDL-C), albumin (ALB), globulin (GLB), and total protein (TP) were measured by Multiskan Spectrum (ThermoFisher, USA).

Primer sequences

According to the sequence of duck [beta]-Actin gene (GenBank Accession No: EF667345) and ChREBP gene (NW_004676726.1). Eleven pair primers were designed to detect the mRNA expression level and polymorphisms of ChREBP gene. The sequences information of the primers was shown in Table I.

Table I.- The information of primer sequences.

Primers name###Primer sequence (5'3')###Position/Product size (bp)###Tm (AdegC)

C1-F/R###F: GCAGACCACTAAGGGCTTCC###g.229706-230105/exon1/400###60

###R: ACTGGGGGATCAGTGAGACG

C2-F/R###F: TCCCTTCAGCCTCTCTTTTG###g.237698-237891/exon2/194###58

###R: ACATGGCATTACCCAGCACT

C3-F/R###F: GCACCCAGCCCTAGAGTGT###g.237920-238138/exon3/209###56

###R: CAACCTGCTCCTGGCTACAG

C4-F/R###F: CCACCAGCTCCTTTTCTCC###g.239529-239775/exon6/247###60

###R: ATGGCTTGGGGCACCTAC

C5-F/R###F: GTGAGGTTTGGTCCCTGATG###g.246886-247179/exon10/294###60

###R: AGTTCCCAGTCACCCCACTC

C6-F/R###F: TCAGCCTGTCTTCCCTAAGC###g. 247822-248062/exon11/241###56

###R: GTGGGGGTGAATTTGGTTG

C7-F/R###F: GGGTCAGCCCATATCCAGT###g.248079-248301/exon12/223###58

###R: TCTGCTCTGTCCTGCACACT

C8-F/R###F: CAAGACCTCATGCCTTTTGC###g.248457-248679/exon13/223###58

###R: CCCAACACAGGTAGCAGCTC

C9-F/R###F: AGCCTCCTGACTGCAGACTC###g.248967-249152/exon14/186###60

###R: CACCAGCCCCAAAGGATAC

[beta]-Actin-F/R###F: GGGTTCAGGGGAGCCTCTGT###107###60

###R: AACTGGGATGACATGGAGAAGA

ChREBP-F/R###F: CAGCACTTCGACTTGGACAC###133###60

###R: AGTCTGGCTGGATCATGTCG

DNA isolation, RNA isolation and cDNA synthesis

Genomic DNA of 321 birds were extracted from the blood samples using QIAamp DSP DNA Blood Mini Kit (Shanghai Labpal Co. Ltd., China). The total RNA of sixteen kinds of tissues samples from 6 ducks and the liver total RNA of all individual were isolated by Trizol Reagent (RNA Extraction Kit, Invitrogen, USA), respectively. The concentration and quality of total RNA and genomic DNA were estimated by spectrophotometer Nano-Drop 2000 (USA) and agarose-gel electrophoresis. For expression analysis, total RNA was treated by DNAse I (Invitrogen, USA). Each treatment contained 20-50 ug total RNA, 5 uL 10 xRNase I buffer, 20 U RNase inhibitor, 2 uL(10 U) DNase I (RNase-free), RNase-free dH2O up to 50 uL, and then 37AdegC for 20 min, subsequently detected and adjusted concentration to 100 ng/uL. All of total RNA were reverse transcribed into cDNA using the PrimeScript(tm) RT reagent Kit (Perfect Real Time) (Dalian TaKaRa Co. Ltd., China) for real-time quantitative RT-PCR (qRT-PCR) analysis.

Real-time qRT-PCR analysis

A housekeeping gene, duck[beta]-Actin, was used in parallel for each run as an internal control. Two sets of primers (Table I), [beta]-Actin-F/R and ChREBP-F/R, were used to detect the ChREBP mRNA levels in the sixteen different tissues. For duck ChREBP mRNA lever, the relative quantitative real-time polymerase chain reaction (qRT-PCR) was performed with an ABI 7500 (ABI, USA) using SYBRA(r) Premix Ex TapTM II (Takara Dalian, Japan). Each reaction mixture contained 10 uL SYBRA(r) Premix Ex TapTM II, 1 uL of each primer (10 uM), 0.5 uL of ROX Reference Dye II, 1 uL of cDNA and 6.5 uL of RNase-free water in a final volume of 20 uL. The experimental run protocol was a denaturation step at 95AdegC for 1 min, 40 cycles of amplification (95AdegC for 15s, 60AdegC for 34s), and final denaturation at 95AdegC for 15s, at 60AdegC for 60s, at 95AdegC for 15s, and at 60AdegC for 15s. To check the specificity of the PCR reaction, melting curves were acquired and analyzed by continuous fluorescence acquisition using SDS1.4 software.

Quantitative values were obtained from the threshold cycle (Ct) at which a significant increase in the magnitude of the signal generated by the PCR reaction was detected. The relative amount of duck ChREBP mRNA in various tissues was calculated by the formula 2-IICt. Statistical analyses of the relative expression of duck ChREBP mRNA in distinct tissues were processed with the least square method using SPSS 17.0 software. The expression levels in different tissues were presented as least square mean +- standard error.

PCR amplification, direct sequencing and SNP detection

Nine pairs of primers (C1-F/R-C9-F/R, as shown in Table I) were used to detect polymorphism of the ChREBP gene. The PCR was performed in a final volume of 25uL that consisted of 10uL 2xTaq Master Mix (pfu) (Shanghai Labpal Co. Ltd., China), 12uL free water, 1uL of each primer and 1uL genomic DNA. PCR profile was used: initial denaturation for 10 min at 95AdegC; 35 cycles of 94AdegC for 45 s, annealing for 30 s at the temperature shown in Table I, extension for 35 s at 72AdegC; final extension for 10 min at 72AdegC, preserved at 4AdegC. The amplified fragments were characterized by 1.5% agarose gel electrophoresis. The gels were visualized by GoldenView. All of the PCR products were purified and sequenced by Shanghai Labpal Co. Ltd., China. Sequence was edited and screened single nucleotide polymorphisms (SNPs) by software MEGA 6.0.

Statistical analysis

Allele frequency, genotype frequency, chi-squar (I2), polymorphism information content (PIC), effective number of alleles (Ne) and heterozygosities (h) were calculated by PopGen32 V1.31. Correlation coefficients were calculated between gene expression and serum biochemical indexes by bivariate Correlation. SPSS 16.0 (General linear model procedures) was used to analyze relationships between genotypes and serum biochemical indexes according to the following model: Y =u+ G + e, Y-dependent variable (analyzed traits), u-overall mean, G-fixed effects of genotype or mRNA expression level, and e-random error. Multiple comparisons were performed with the least squares means, were given as means +- standard error. Values were regarded to be statistically significant with P <0.01 or P pituitary > subcutaneous fat > lung > small intestine > large intestine > hypothalamus > heart > kidney > breast muscles > cerebrum > cerebellum > liver > proventriculus > spleen > gizzard. Salamanca et al. (2015) reported that the metabolic pathways of lipid deposition and elimination are regulated tightly by the nutritionally regulated transcription factors Foxo1, Foxa2, ChREBP and SREBP-1c. The subcellular distribution of ChREBP between the nucleus and cytosol is controlled by different metabolites including xylulose 5-phosphate, glucose 6-phosphate, fructose 2,6-biphosphate and ketone bodies (Nakagawa et al., 2013).

In mammals, ChREBP was expressed in key metabolic tissues including liver, adipose tissue, small intestine, kidney, and skeletal muscle, brain and spleen (Iizuka et al., 2004). In lean and obese patients, ChREBP increased in the liver from obese compared to lean subjects, whereas the expression decreased in both adipose tissues. The expression levels of ChREBP mRNA and protein were dramatically increased during the differentiation of human omental and subcutaneous preadipocytes (Hurtado del Pozo et al., 2011). In chicken, ChREBP mRNA level from high to low: liver > duodenum > kidney > pancreas > brain > spleen > abdominal fat > hypothalamus > heart > breast muscles. ChREBP demonstrated the most tissue-specific expression pattern with the highest mRNA levels detected in liver and duodenum and the lowest in heart and skeletal muscle (Proszkowiec-Weglarz et al., 2008).

However, in duck, ChREBP mRNA level was the highest in abdominal fat and the lowest in gizzard, what's more, it's mRNA level in the pituitary was second only to abdominal fat in this study. Numerous studies had indicated that the growth hormone secreted by the pituitary gland can significantly affect the lipid metabolism of animals (Angelin and Rudling, 1994; Oscarsson et al., 1999). From the experimental results, we speculated that whether ChREBP had an inevitable link with growth hormone to jointly achieve the regulation of fat metabolism, which will be the content we will further study in the future. As a whole, the result indicated that the ChREBP mRNA expression level was similar between chicken and duck, and it has significant difference to mammals and human, and suggested the germplasm difference between birds and mammals. Our research results indicated that the level of duck ChREBP mRNA may play a role in adipogenesis.

Polymorphism identification, allele and genotype distribution

All of the target fragments were successfully amplified using nine pairs primers (C1-F/R-C9-F/R, as shown in Table I) for the ChREBP gene, which could be analysed by direct sequencing. Only g.247075G>A silent mutation was found in exon 10 by sequence alignment (Fig. 2). Properties of the g.247075G>A mutation are listed in Table II. The dominant genotype and allele were GG and G, with frequencies of 0.4486 and 0.5982, respectively. Heterozygosity (h) and polymorphism information content (PIC) were 0.4807 and 0.3652, respectively. Botstein et al. (1980) reported that a PIC values from 0.25 to 0.5 is considered to be moderately informative. Under this formulation, the g.247075G>A locus was a moderate degree of polymorphism in Cherry Valley ducks.

Chi-square test indicated that the g.247075G>A locus deviated from Hardy-Weinberg equilibrium (P<0.01), in which genotypes frequencies was likely to been distorted by migration, mutation, long-term artificial selection or other reasons. Furthermore, only a single SNP was detected in this species, suggesting that the ChREBP gene sequence might have been highly conserved through evolution.

Correlation between ChREBP gene expression and serum biochemical indices

ChREBP is a key lipogenic transcription factors responsible for the induction of gene encoding enzymes involved in fatty acid and triacylglyceride synthesis in the liver (Filhoulaud et al., 2013). In our study, correlation analysis between ChREBP mRNA expression level in liver of Cherry Valley ducks (321 females) and serum biochemical indices were shown in Table III. Significant positive or negative correlations were found between liver ChREBP mRNA expression level and serum total protein (TP), albumin (Alb), triglyceride (TG), total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C) and low-density lipoprotein cholesterol (LDL-C) (P<0.05 or PA locus of ChREBP gene in Cherry Valley ducks.

SNP###Genotype frequencies###Alleles frequencies###h###PIC###x2

###AA###GA###GG###A###G

g.247075G>A###0.2523###0.2991###0.4486###0.4018###0.5982###0.4807###0.3652###23.03**

Table III.- Association of ChREBP expression with serum biochemical indices in Cherry Valley ducks.

mRNA level###TP (g/L)###ALB (g/L)###GLB (g/L)###TG (mM)###TC (mM)###HDL-C (mM)###LDL-C (mM)

1.23+-0.22###33.79+-0.94###15.10+-0.35###21.14+-0.76###0.84+-0.03###5.44+-0.12###3.33+-0.11###2.01+-0.05

###0.385**###0.401**###-0.091###0.322**###0.235*###0.245*###-0.277*

Table IV.- Least-square means and estimated effects of g.247075G>A locus of ChREBP gene on serum biochemical indices in Cherry Valley ducks.

Indexes###Genotypes###Additive###P value###Dominant###P value

###AA(81)###GA(96)###GG(144)###effect###effect

TP (g/L)###42.15+-1.19a###32.40+-1.28b###30.02+-0.85b###6.07+-0.86###0.00**###3.68+-2.12###0.02*

ALB (g/L)###17.48+-0.37a###14.47+-0.55b###14.19+-0.40b###1.64+-0.35###0.00**###1.36+-0.46###0.25

GLB(g/L)###26.70+-1.10a###21.13+-1.22b###18.01+-0.91b###4.34+-0.76###0.01*###1.22+-1.01###0.09

TG (mmol/L)###0.93+-0.05a###0.82+-0.05b###0.81+-0.04b###0.06+-0.04###0.01*###0.05+-0.07###0.42

TC (mmol/L)###6.23+-0.15a###5.21+-0.17b###5.15+-0.09b###0.54+-0.13###0.00**###0.48+-0.45###0.34

HDL-C (mmol/L)###4.14+-0.08a###3.01+-0.16b###3.08+-0.07b###0.53+-0.12###0.00**###0.60+-0.68###0.18

LDL-C (mmol/L)###2.11+-0.08###2.01+-0.11###1.96+-0.06###0.07+-0.05###0.29###0.02+-0.14###0.73

Association of g.247075G>A mutation with serum biochemical indices

ChREBP genes involved in glucose, carbohydrate and lipid metabolism, and influence accumulation of hepatic triglycerides. Overexpression of a constitutively active form of ChREBP in the liver enhanced insulin sensitivity, but also increased steatosis. Regulation of ChREBP appears to be very complex and responds to environmental conditions, dietary or hormonal changes being clearly tissue-specific. ChREBP isoforms may have different role of the pathophysiological and physiological functions (Jois et al., 2017). In our study, the g.247075G>A locus of ChREBP gene associated with Cherry Valley duck serum biochemical indices were showed in Table IV.

The results of correlation analysis indicated that the g.247075G>A locus was significantly associated with the measured serum biochemical indices except for LDL-C. With the exception of LDL-C, genotype AA was significant higher than genotypes GA and GG, and then there had significant additive effects between allele G and A at P<0.05 or 0.01. However, only TP had significant dominant effect between allele G and A at PA mutation can contribute to the improved the content of lipids, and it may be used in marker assisted selection to improve duck lipid metabolism. However, serum biochemical indexes are complex quantitative traits involving multiple genes, loci, and interactions of various factors. Our research results still requires further physiological and biochemical evidence under the same test conditions.

Acknowledgments

The funding for this work was supported by the National Natural Science Foundation of China (31760663) and science and technology project of Guizhou province (QKHPTRC(2017)5788).

Statement of conflict of interest

Authors have declared no conflict of interest.

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Author:Luo, Hua-Lun; Zhang, Yi-Yu; Qin, Yuan-Yu; Wu, Lei
Publication:Pakistan Journal of Zoology
Article Type:Report
Geographic Code:9CHIN
Date:Jun 30, 2019
Words:5048
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