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Fontanesi L, Galimberti G, Calò DG, Fronza R, Martelli PL, Scotti E, Colombo M, Schiavo G, Casadio R, Buttazzoni L, Russo V. Identification and association analysis of several hundred single nucleotide polymorphisms within candidate genes for back fat thickness in Italian Large White pigs using a selective genotyping approach1. J Anim Sci 2012; 90:2450-64. [DOI: 10.2527/jas.2011-4797] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Affiliation(s)
- L. Fontanesi
- Department of Agro-Food Science and Technology, Sezione di Allevamenti Zootecnici, University of Bologna, Viale Fanin 46, 40127 Bologna, Italy
- Centre of Genome Biology, University of Bologna, 40126 Bologna, Italy
| | - G. Galimberti
- Department of Statistical Sciences “Paolo Fortunati,” University of Bologna, Via delle Belle Arti 41, 40126 Bologna, Italy
| | - D. G. Calò
- Department of Statistical Sciences “Paolo Fortunati,” University of Bologna, Via delle Belle Arti 41, 40126 Bologna, Italy
| | - R. Fronza
- Biocomputing Group, Department of Experimental Evolutionary Biology, University of Bologna, Via San Giacomo, 40126 Bologna, Italy
| | - P. L. Martelli
- Centre of Genome Biology, University of Bologna, 40126 Bologna, Italy
- Biocomputing Group, Department of Experimental Evolutionary Biology, University of Bologna, Via San Giacomo, 40126 Bologna, Italy
| | - E. Scotti
- Department of Agro-Food Science and Technology, Sezione di Allevamenti Zootecnici, University of Bologna, Viale Fanin 46, 40127 Bologna, Italy
| | - M. Colombo
- Department of Agro-Food Science and Technology, Sezione di Allevamenti Zootecnici, University of Bologna, Viale Fanin 46, 40127 Bologna, Italy
| | - G. Schiavo
- Department of Agro-Food Science and Technology, Sezione di Allevamenti Zootecnici, University of Bologna, Viale Fanin 46, 40127 Bologna, Italy
- Centre of Genome Biology, University of Bologna, 40126 Bologna, Italy
- Biocomputing Group, Department of Experimental Evolutionary Biology, University of Bologna, Via San Giacomo, 40126 Bologna, Italy
| | - R. Casadio
- Centre of Genome Biology, University of Bologna, 40126 Bologna, Italy
- Biocomputing Group, Department of Experimental Evolutionary Biology, University of Bologna, Via San Giacomo, 40126 Bologna, Italy
| | - L. Buttazzoni
- CRA, Centro di Ricerca per la Produzione delle Carni e il Miglioramento Genetico, Via Salaria 31, 00015 Monterotondo Scalo, Rome, Italy
| | - V. Russo
- Department of Agro-Food Science and Technology, Sezione di Allevamenti Zootecnici, University of Bologna, Viale Fanin 46, 40127 Bologna, Italy
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Duthie C, Simm G, Doeschl-Wilson A, Kalm E, Knap PW, Roehe R. Epistatic analysis of carcass characteristics in pigs reveals genomic interactions between quantitative trait loci attributable to additive and dominance genetic effects. J Anim Sci 2010; 88:2219-34. [PMID: 20228239 DOI: 10.2527/jas.2009-2266] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The present study focused on the identification of epistatic QTL pairs for body composition traits (carcass cut, lean tissue, and fat tissue weights) measured at slaughter weight (140 kg of BW) in a 3-generation full-sib population developed by crossing Pietrain sires with a crossbred dam line. Depending on the trait, phenotypic observations were available for 306 to 315 F(2) animals. For the QTL analysis, 386 animals were genotyped for 88 molecular markers covering chromosomes SSC1, SSC2, SSC4, SSC6, SSC7, SSC8, SSC9, SSC10, SSC13, and SSC14. In total, 23 significant epistatic QTL pairs were identified, with the additive x additive genetic interaction being the most prevalent. Epistatic QTL were identified across all chromosomes except for SSC13, and epistatic QTL pairs accounted for between 5.8 and 10.2% of the phenotypic variance. Seven epistatic QTL pairs were between QTL that resided on the same chromosome, and 16 were between QTL that resided on different chromosomes. Sus scrofa chromosome 1, SSC2, SSC4, SSC6, SSC8, and SSC9 harbored the greatest number of epistatic QTL. The epistatic QTL pair with the greatest effect was for the entire loin weight between 2 locations on SSC7, explaining 10.2% of the phenotypic variance. Epistatic associations were identified between regions of the genome that contain the IGF-2 or melanocortin-4 receptor genes, with QTL residing in other genomic locations. Quantitative trait loci in the region of the melanocortin-4 receptor gene and on SSC7 showed significant positive dominance effects for entire belly weight, which were offset by negative dominance x dominance interactions between these QTL. In contrast, the QTL in the region of the IGF-2 gene showed significant negative dominance effects for entire ham weight, which were largely overcompensated for by positive additive x dominance genetic effects with a QTL on SSC9. The study shows that epistasis is of great importance for the genomic regulation of body composition in pigs and contributes substantially to the variation in complex traits.
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Affiliation(s)
- C Duthie
- Animal Breeding and Development, Sustainable Livestock Systems Group, Scottish Agricultural College, West Mains Road, Edinburgh, EH9 3JG, United Kingdom
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Liu K, Wang G, Zhao SH, Liu B, Huang JN, Bai X, Yu M. Molecular characterization, chromosomal location, alternative splicing and polymorphism of porcine GFAT1 gene. Mol Biol Rep 2010; 37:2711-7. [PMID: 19757168 DOI: 10.1007/s11033-009-9805-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2009] [Accepted: 09/02/2009] [Indexed: 10/20/2022]
Abstract
Glutamine: fructose-6-phosphate amidotransferase (GFAT) is the rate-limiting enzyme of the hexosamine synthesis pathway, which plays important roles in insulin resistance and glucose toxicity. GFAT1 is one of the two isoenzymes of GFAT. In the present study, we cloned cDNA sequence of the porcine GFAT1 gene and identified a GFAT1 splice variant (designed GFAT1-L) that contains a 54 bp insertion within the coding region. Nested RT-PCR revealed that GFAT1 was ubiquitously expressed in all tested tissues, but GFAT1-L was only expressed in skeletal muscle and heart, not in liver, spleen, lung, kidney, small intestine, stomach and fat tissue, suggested that GFAT1-L was selectively expressed in striate muscle in pig. Using both the somatic cell hybrid panel and radiation hybrid panel, the GFAT1 gene was mapped to porcine chromosome 3q21-q27, in which several significant QTLs for carcass traits were found. Among the SNPs we found in porcine GFAT1 gene, only the g. 101A>G polymorphism which located in intron 8 was polymorphic in two pig populations we investigated in the study. Association analyses revealed that the g. 101A>G polymorphism has a significant effect on lean meat percentage (P < 0.05), corrected backfat thickness (P < 0.05) and backfat at the rump (P < 0.05).
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Wang L, Mo X, Xu Y, Zuo B, Lei M, Li F, Jiang S, Deng C, Xiong Y. Molecular characterization and expression patterns of AMP deaminase1 (AMPD1) in porcine skeletal muscle. Comp Biochem Physiol B Biochem Mol Biol 2008; 151:159-66. [PMID: 18638563 DOI: 10.1016/j.cbpb.2008.06.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2008] [Revised: 06/17/2008] [Accepted: 06/18/2008] [Indexed: 11/22/2022]
Abstract
AMPD1 is the muscle-specific form of the AMPD multigene families in mammals and plays an important role in the purine nucleotide cycle and energy metabolism in skeletal muscle. In this study, we cloned and characterized AMPD1 from Sus scrofa muscle. The promoter of porcine AMPD1 contained several putative muscle-specific transcription factor binding sites (E box, myogenin, MEF2, Spl-CTF/NF-l), one RORalpha2 binding motif and NF-kappaB site. The deduced amino acid sequence of porcine AMPD1 contains an AMP deaminase signature sequence (SLSTDDP). RT-PCR analyses showed that AMPD1 was expressed specifically in skeletal muscle. Expression of AMPD1 was up-regulated during the muscle development and was higher in Yorkshire than in Meishan pigs. AMPD1 gene was expressed at higher levels in longissimus dorsi and bicepsfemoris muscles compared with soleus and masseter muscles in both Yorkshire and Meishan pigs. Moreover, we found that a single nucleotide polymorphism (SNP, T/C(426)) in exon12 of the AMPD1 gene was significantly associated with loin muscle area trait (p<0.01), loin muscle height (p<0.01) and average backfat thickness (p<0.05). This result suggests that the AMPD1 gene might be a candidate gene of meat production trait and provides useful information for further studies on its roles in porcine skeletal muscle.
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Feng Z, Tang ZL, Li K, Liu B, Yu M, Zhao SH. Molecular characterization of the BTG2 and BTG3 genes in fetal muscle development of pigs. Gene 2007; 403:170-7. [PMID: 17890019 DOI: 10.1016/j.gene.2007.08.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2007] [Revised: 07/03/2007] [Accepted: 08/10/2007] [Indexed: 11/19/2022]
Abstract
BTG2 and BTG3 are two members of the B-cell translocation gene family with anti-proliferative properties. BTG1 gene in this gene family has been reported to play a key role in muscle growth. In this study, we identified and characterized the porcine BTG2 and BTG3 genes, mapped the two genes to porcine chromosomes, and analyzed their expression differences in the longissimus dorci muscle of 33 dpc (day postconception), 65 dpc and 90 dpc in the lean Landrace and fatty Chinese Tongcheng pig breeds. Expression changes in differentiated C2C12 cells were also investigated with myogenin as internal control. The results showed that the porcine BTG2 and BTG3 genes were mapped on SSC9q21-25 and SSC13q47, respectively. BTG2 gene expressed at high levels in skeletal muscle and heart in both Tongcheng and Landrace pigs whereas BTG3 gene expressed at lower levels in skeletal muscle and heart than in other tissues. Furthermore, BTG3 expressed at higher levels in skeletal muscle of Tonghceng compared with Landrace pig. The expression of BTG2 and BTG3 was significantly different in skeletal muscle among different developmental stages and between the two breeds. Expression analysis in murine myoblast cells showed that both genes were induced in differentiated C2C12 cells, suggesting a role of them in myogenic differentiation. Our study indicated that BTG2 and BTG3, especially BTG3 gene, may be important genes for skeletal muscle growth.
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Affiliation(s)
- Zheng Feng
- Key Lab of Agricultural Animal Genetics, Breeding, and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, PR China
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Abstract
The SDHD gene was examined for single nucleotide polymorphisms (SNP) as well as for expression changes in the Longissimus dorsi muscle of commercial pigs with different potential for growth. Three SNPs, including one previously described in the coding region and two new ones in the 3'-UTR, were found. The normalized expression of SDHD was correlated with growth, meat quality and sensory traits (p < 0.05). For the commercial pigs used in this study, as well as a Berkshire x Yorkshire resource population, the SNPs have been associated (p < 0.05) with: growth, carcass composition, meat quality and sensory traits. Despite the fact that the described SNPs were not significantly associated with the normalized expression values, the SDHD SNPs and expression were associated with growth and meat quality traits in pigs.
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Affiliation(s)
- S E F Guimaraes
- Department of Animal Science and Center for Integrated Animal Genomics, Iowa State University, Ames, IA, USA.
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Abstract
The SDHD gene was examined for single nucleotide polymorphisms (SNP) as well as for expression changes in the Longissimus dorsi muscle of commercial pigs with different potential for growth. Three SNPs, including one previously described in the coding region and two new ones in the 3'-UTR, were found. The normalized expression of SDHD was correlated with growth, meat quality and sensory traits (p<0.05). For the commercial pigs used in this study, as well as a Berkshire x Yorkshire resource population, the SNPs have been associated (p<0.05) with: growth, carcass composition, meat quality and sensory traits. Despite the fact that the described SNPs were not significantly associated with the normalized expression values, the SDHD SNPs and expression were associated with growth and meat quality traits in pigs.
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Affiliation(s)
- S E F Guimaraes
- Department of Animal Science and Center for Integrated Animal Genomics, Iowa State University, Ames, IA, USA.
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Wu X, Yang S, Zhu Z, Feng S, Li K. Characterization of the Full-length cDNA, Chromosomal Localization, and Polymorphism of the Porcine RPLP0 Gene. J Genet Genomics 2007; 34:104-8. [PMID: 17469782 DOI: 10.1016/s1673-8527(07)60011-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2006] [Accepted: 07/30/2006] [Indexed: 11/28/2022]
Abstract
RPLP0 gene encodes the acidic ribosomal phosphoprotein large P0 subunit, which is a component of the 60S subunit. The full-length cDNA sequence of porcine RPLP0 was obtained from skeletal muscle of fetal pig cDNA library and deposited in GenBank. The nucleotide sequence and the predicted protein sequence shared high sequence identity with other mammalian homologues. A C/A single nucleotide substitution in exon 5 was detected as Csp6?polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) shows allele frequency diversity among Tongcheng, Xiaomeishan, Yushan, Large White, Landrace, and Duroc breeds. Analyses of somatic cell hybrid panel (SCHP) and radiation hybrid (IMpRH) panel showed that the RPLP0 gene was mapped to SSC 14q22-q24 and was closely linked to locus SW1321 (25 cR, LOD = 14.54).
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Affiliation(s)
- Xiao Wu
- Department of Gene and Cell Engineering, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100094, China
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Li X, Zhu Z, Mo D, Wang H, Yang S, Zhao S, Li K. Comparative molecular characterization of ADSS1 and ADSS2 genes in pig (Sus scrofa). Comp Biochem Physiol B Biochem Mol Biol 2007; 147:271-7. [PMID: 17347008 DOI: 10.1016/j.cbpb.2007.01.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2006] [Revised: 01/17/2007] [Accepted: 01/19/2007] [Indexed: 10/23/2022]
Abstract
Adenylosuccinate synthetase (ADSS) catalyzes the key step of AMP synthesis. Vertebrates have two isozymes of ADSS, which are named ADSS1 and ADSS2, respectively. In this study, we cloned porcine ADSS1 and ADSS2 genes and comparatively analyzed their sequence, chromosome mapping, mRNA distribution and subcellular localization. According to our results, the ADSS1 gene was predominantly expressed in the striated muscle tissues, while ADSS2 gene distributed widely in all the tissues detected. Additionally, ADSS1 gene was up-regulated significantly along with porcine muscle growth, and ADSS2 gene expression was more constant during the muscle development. Porcine ADSS1 gene was assigned to SSC7q and the linked marker was SSC12B09, ADSS2 gene was mapped on SSC10p and the linked marker was SW497, and porcine ADSS2 protein was subcellular localized in mitochondria. Moreover, we found that one single nucleotide polymorphism (SNP, T/C(70)) in the ninth intron of ADSS2 gene was significantly associated with average daily gain trait (ADG, P<0.05) and loin muscle area trait (P<0.05).
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Affiliation(s)
- Xinyun Li
- Department of Gene and Cell Engineering, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100094, PR China
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Abstract
A full-length cDNA clone encoding the eukaryotic translation initiation factor 4A, isoform 2 (EIF4A2), was cloned from the fetal skeletal cDNA library from the pig (Sus scrofa). EIF4A2 is a highly conserved gene for one of the protein-synthesis initiation factors involved in the binding of mRNA to the ribosome. Based on this cDNA sequence, the deduced protein of 407 amino acids contains the characteristic motifs shared by the DEAD-box supergene family. The genomic nucleotide sequence of this gene was determined and a single nucleotide polymorphism located in the 5' untranslated region was genotyped. The porcine EIF4A2 was expressed in all tissues examined but in variable amounts. The EIF4A2 expression level in muscle was upregulated through embryonic and neonatal development until adult, suggesting that porcine EIF4A2 was possibly involved in translation regulation of other muscle-related genes in muscle formation and development. In addition, we mapped porcine EIF4A2 to q4.1 of SSC13, in agreement with comparative mapping data.
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Affiliation(s)
- Heng Wang
- Key Laboratory of Animal Genetics, Breeding, and Reproduction of Ministry of Education of China, Huazhong Agricultural University, Wuhan 430070, PR China
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Wang HL, Zhu ZM, Wang H, Yang SL, Zhao SH, Li K. Molecular characterization and association analysis of porcine CA3. Cytogenet Genome Res 2006; 115:129-33. [PMID: 17065793 DOI: 10.1159/000095232] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2005] [Accepted: 03/13/2006] [Indexed: 11/19/2022] Open
Abstract
Carbonic anhydrase 3 (CA3) is a member of the carbonic anhydrase family, which plays an important role in various cell processes. In this paper, molecular characterization revealed that CA3 genomic DNA consists of seven exons and six introns, spans about 10.5 kb and maps to porcine chromosome 4q11-->q14. Results of expression profiles showed that the expression levels of CA3 increased in skeletal muscles from prenatal 33- to 65-day-old Chinese Tongcheng pigs. These levels subsequently decreased to a steady state in prenatal 90-day-old, postnatal 2-day-old, postnatal 28-day-old, and pregnant 65-day-old pigs. The expression patterns of Chinese Tongcheng pig embryos were different from that of Landrace pig embryos. CA3 was expressed at higher levels in skeletal muscle and liver than in kidney, lung, stomach, intestine, and brain, but was not detected in heart and spleen. Statistical analysis showed the CA3 gene polymorphism was different between Chinese indigenous and introduced commercial western pig breeds, and was associated with intramuscular fat content and percentage of ham of pigs.
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Affiliation(s)
- H L Wang
- Department of Gene and Cell Engineering, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, PR China
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Zhu Z, Li Y, Mo D, Li K, Zhao S. Molecular characterization and expression analysis of the porcine caveolin-3 gene. Biochem Biophys Res Commun 2006; 346:7-13. [PMID: 16750814 DOI: 10.1016/j.bbrc.2006.04.132] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2006] [Accepted: 04/24/2006] [Indexed: 01/09/2023]
Abstract
Caveolin-3 is the muscle-specific form of the caveolin protein family and plays an important role in modulating both the morphological appearance and function of caveolae. In this study, we cloned and characterized caveolin-3 from porcine muscle. The promoter of porcine caveolin-3 contained three consensus E box elements and one RORalpha2 monomeric binding motif. The deduced amino acid sequence of porcine caveolin-3 contains a WW domain. This gene was mapped to SSC13 q23-q24 by the SCHP and the IMpRH panel. RT-PCR analyses showed that caveolin-3 was expressed specifically in skeletal muscle and heart. And we provide the first evidence that caveolin-3 has a certain regulated expression pattern during the prenatal period of the porcine skeletal muscle development. This result suggests that the caveolin-3 gene might be a candidate gene of meat production trait and provides some information for establishing of an animal model using pig to study human caveolinopathies.
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Affiliation(s)
- Zhengmao Zhu
- Key Lab of Agricultural Animal Genetics, Breeding, and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan 430070, PR China
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Wang HL, Wang H, Zhu ZM, Wang CF, Zhu MJ, Mo DL, Yang SL, Li K. Subcellular localization, expression patterns, SNPs and association analyses of the porcine HUMMLC2B gene. Mol Genet Genomics 2006; 276:264-72. [PMID: 16802157 DOI: 10.1007/s00438-006-0142-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2006] [Accepted: 06/03/2006] [Indexed: 10/24/2022]
Abstract
Myosin regulatory light chain (MLC) regulates myofilament activation via phosphorylation by Ca(2+) dependant myosin light chain kinase. In order to further understand the functions of the porcine fast myosin regulatory light chain gene (HUMMLC2B) in muscle, the subcellular localization, the temporal and spatial distributions of its gene product were analyzed, and the association between the presence of specific polymorphisms and commercial meat traits in pig was also examined. HUMMLC2B was demonstrated to localize both in the cytoplasm and the nucleus by confocal fluorescence microscopy. Real-time PCR further revealed HUMMLC2B expression variation in a waveform manner in the skeletal muscle of both Chinese Tongcheng and Western Landrace pig breeds at days 33, 65 and 90 post coitum (pc). After birth, the expression levels of HUMMLC2B were also found to decrease gradually with age. Our spatial expression analysis showed that HUMMLC2B was highly expressed in the semitendinosus, gastrocnemius, biceps femoris and longissimus dorsi muscles. In contrast, only low levels of expression of this gene were evident in fat, and no expression was detectable in brain, heart, kidney, lung, liver, lymph node, spleen, stomach, or in either large or small intestine. A total of 23 potential polymorphisms, comprising 3 exonic and 20 intronic, were detectable in the porcine HUMMLC2B gene and the G1094A, T1513C, G1876A and T2005G polymorphisms were further analyzed. The significant associations between the T1513C, G1876A and T2005G polymorphisms with marbling score, dressing percent and meat color, respectively, were identified (P < 0.05). Associations with the percentage of leaf fat could also be demonstrated by analysis of haplotypes harboring these three polymorphisms. Our current results thus shed further light on the roles and functions of the HUMMLC2B gene in muscle.
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Affiliation(s)
- Huan L Wang
- Department of Gene and Cell Engineering, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100094 People's Republic of China
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Wang HL, Wang H, Zhu ZM, Yerle M, Wu X, Yang SL, Li K. Radiation hybrid mapping of five genes isolated from a porcine fetus skeletal muscle cDNA library. Anim Genet 2006; 36:529-30. [PMID: 16293138 DOI: 10.1111/j.1365-2052.2005.01374.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- H L Wang
- Department of Gene and Cell Engineering, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100094, China
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