scholarly journals Génomique des canards

2013 ◽  
Vol 26 (5) ◽  
pp. 391-402
Author(s):  
A. VIGNAL ◽  
C. DIOT ◽  
C. MOLETTE ◽  
M. MORISSON ◽  
T. FARAUT ◽  
...  
Keyword(s):  
Quantitative Trait Locus ◽  
Single Nucleotide Polymorphism ◽  
Quantitative Trait ◽  
Premier Lieu ◽  
Haut Débit ◽  
Nucleotide Polymorphism ◽  
Single Nucleotide ◽  
Trait Locus

La démocratisation des outils de la génomique et plus particulièrement du séquençage à haut débit a permis le séquençage du génome du canard commun. Des projets complémentaires sont déjà initiés pour prolonger et exploiter au mieux ces premiers acquis. En tout premier lieu, il s’agit de poursuivre la description de la structure du génome et d’en exploiter les connaissances : cartes d’hybrides irradiés pour ordonner la séquence le long des chromosomes ; génomique comparée avec le génome de la poule pour bénéficier des connaissances sur ce génome modèle ; recherche de SNP (Single Nucleotide Polymorphism) pour les études et la gestion de populations ; carte génétique pour la détection des QTL (Quantitative Trait Locus). La première détection de QTL influençant les performances du mulard, réalisée à l’aide de marqueurs microsatellites chez la cane commune, sera complétée par une seconde étude utilisant des marqueurs SNP développés spécifiquement et permettant une bien meilleure couverture du génome. Par ailleurs, il est important de réaliser une annotation fonctionnelle du génome, ce qui peut être abordé par le séquençage de transcrits. A terme, le génome annoté sera utilisé pour analyser son expression dans différents tissus et/ou conditions d’élevage, la connaissance des modèles de transcrits et de protéines facilitant les études en transcriptomique et protéomique. Le canard mulard,  produit du croisement de la cane commune avec le canard de Barbarie, devra également être étudié en raison de son intérêt agronomique, lié à ses performances exceptionnelles dans la filière des palmipèdes gras.

scholarly journals Regulation of Janus Kinase 2 by an Inflammatory Bowel Disease Causal Non-coding Single Nucleotide Polymorphism

2020 ◽  
Vol 14 (5) ◽  
pp. 646-653
Author(s):  
Christopher J Cardinale ◽  
Michael E March ◽  
Xiang Lin ◽  
Yichuan Liu ◽  
Lynn A Spruce ◽  
...  
Keyword(s):  
Inflammatory Bowel Disease ◽  
Quantitative Trait Locus ◽  
Single Nucleotide Polymorphism ◽  
Bowel Disease ◽  
Quantitative Trait ◽  
Janus Kinase ◽  
Nucleotide Polymorphism ◽  
Single Nucleotide ◽  
Inflammatory Bowel ◽  
Trait Locus

Abstract Background and Aims Among the >240 genetic loci described to date which confer susceptibility to inflammatory bowel disease, a small subset have been fine-mapped to an individual, non-coding single nucleotide polymorphism [SNP]. To illustrate a model mechanism by which a presumed-causal non-coding SNP can function, we analysed rs1887428, located in the promoter region of the Janus kinase 2 [JAK2] gene. Methods We utilized comparative affinity purification-mass spectrometry, DNA–protein binding assays, CRISPR/Cas9 genome editing, transcriptome sequencing and methylome quantitative trait locus methods to characterize the role of this SNP. Results We determined that the risk allele of rs1887428 is bound by the transcription factor [TF] RBPJ, while the protective allele is bound by the homeobox TF CUX1. While rs188748 only has a very modest influence on JAK2 expression, this effect was amplified downstream through the expression of pathway member STAT5B and epigenetic modification of the JAK2 locus. Conclusion Despite the absence of a consensus TF-binding motif or expression quantitative trait locus, we have used improved methods to characterize a putatively causal SNP to yield insight into inflammatory bowel disease mechanisms. Podcast This article has an associated podcast which can be accessed at https://academic.oup.com/ecco-jcc/pages/podcast

scholarly journals Molecular Mapping of the Major Resistance Quantitative Trait Locus qHS2.09 with Simple Sequence Repeat and Single Nucleotide Polymorphism Markers in Maize

2012 ◽  
Vol 102 (7) ◽  
pp. 692-699 ◽  
Author(s):  
Jianfeng Weng ◽  
Xianjun Liu ◽  
Zhenhua Wang ◽  
Jianjun Wang ◽  
Lin Zhang ◽  
...  
Keyword(s):  
Quantitative Trait Locus ◽  
Single Nucleotide Polymorphism ◽  
Quantitative Trait ◽  
Nucleotide Polymorphism ◽  
Head Smut ◽  
Maize Breeding ◽  
Single Nucleotide ◽  
Breeding Programs ◽  
Trait Locus ◽  
Major Qtl

The major quantitative trait locus (QTL) qHS2.09 plays an important role in resistance to head smut during maize breeding and production. In this study, a near-isogenic line (NIL), L34, which harbors the major QTL qHS2.09 in bin 2.09, was developed using a resistant donor ‘Mo17’ in a susceptible genetic background ‘Huangzao4’. Using 18,683 genome-wide polymorphic loci, this major QTL was finely mapped into an interval of ≈1.10 Mb, flanked by single nucleotide polymorphism (SNP) markers PZE-102187307 and PZE-102188421. Moreover, the favorable allele from ‘Mo17’ for SNP PZE-102187611 in this interval that was most significantly associated with resistance to head smut (P = 1.88 E-10) and accounted for 39.7 to 44.4% of the phenotypic variance in an association panel consisting of 80 inbred lines. With combined linkage and association mapping, this major QTL was finally located between SNP PZE-102187486 and PZE-102188421 with an interval of ≈1.00 Mb. Based on the pedigrees of ‘Mo17’ and its derivatives widely used in temperate maize breeding programs, the favorable haplotype from ‘Mo17’ is shown to be the main source of resistance to head smut in these lines. Therefore, the SNPs closely linked to the major QTL qHS2.09, detected in both linkage and association mapping, and could be useful for marker-assisted selection in maize breeding programs.

The TG5 thyroglobulin gene test for a marbling quantitative trait loci evaluated in feedlot cattle

2004 ◽  
Vol 44 (7) ◽  
pp. 669 ◽  
Author(s):  
W. Barendse ◽  
R. Bunch ◽  
M. Thomas ◽  
S. Armitage ◽  
S. Baud ◽  
...  
Keyword(s):  
Single Nucleotide Polymorphism ◽  
Quantitative Trait Loci ◽  
Dna Sequence ◽  
Dna Markers ◽  
Quantitative Trait ◽  
Allelic Association ◽  
Nucleotide Polymorphism ◽  
Single Nucleotide ◽  
Trait Loci ◽  
Thyroglobulin Gene

The TG5 (thyroglobulin 5′ leader sequence) single nucleotide polymorphism has been associated with marbling in cattle fed for periods longer than 250 days. To test whether the association could be detected in diverse cattle, fed for less than 250 days, and to measure the size of the effect, we sampled 1750 cattle from the AMH Toowoomba feedlot. These cattle were sampled on 28 separate days, over 9 months. Their marbling scores covered the complete range. We found that the TG5 single nucleotide polymorphism was associated with marbling scores (P<0.05) and estimated that TG5 genotypes explained 6.5% of the residual deviance for the marbling phenotype. We also found that the '3' allele was more frequent in animals with higher marbling scores. The consistency of the allelic association between studies and, in particular, the association found in diverse cattle, indicate that the TG5 polymorphism can be used as a breeding tool and possibly a feedlot entry tool. To estimate the size of the genetic region in which the marbling quantitative trait loci are located, we tested the nearby DNA markers CSSM66 and BMS1747. These do not show allelic associations to marbling. The consistency of the allelic association between studies, the lack of association to nearby DNA markers and the complementary information on gene action of genes near Thyroglobulin suggest that DNA sequence variations, in or near the Thyroglobulin gene sequence, are the likely causes for the marbling quantitative trait loci. Further studies of single nucleotide polymorphism in and near the Thyroglobulin DNA sequence should allow causal mutations for the effect to be identified.

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