Genetic and genomic analyses underpin the feasibility of concomitant genetic improvement of milk yield and mastitis resistance in dairy sheep

Milk yield is the most important dairy sheep trait and constitutes the key genetic improvement goal via selective breeding. Mastitis is one of the most prevalent diseases, significantly impacting on animal welfare, milk yield and quality, while incurring substantial costs. Our objectives were to det...

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Veröffentlicht in:PloS one 2019-11, Vol.14 (11), p.e0214346
Hauptverfasser: Banos, Georgios, Clark, Emily L, Bush, Stephen J, Dutta, Prasun, Bramis, Georgios, Arsenos, Georgios, Hume, David A, Psifidi, Androniki
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container_issue 11
container_start_page e0214346
container_title PloS one
container_volume 14
creator Banos, Georgios
Clark, Emily L
Bush, Stephen J
Dutta, Prasun
Bramis, Georgios
Arsenos, Georgios
Hume, David A
Psifidi, Androniki
description Milk yield is the most important dairy sheep trait and constitutes the key genetic improvement goal via selective breeding. Mastitis is one of the most prevalent diseases, significantly impacting on animal welfare, milk yield and quality, while incurring substantial costs. Our objectives were to determine the feasibility of a concomitant genetic improvement programme for enhanced milk production and resistance to mastitis. Individual records for milk yield, and four mastitis-related traits (milk somatic cell count, California Mastitis Test score, total viable bacterial count in milk and clinical mastitis presence) were collected monthly throughout lactation for 609 ewes of the Chios breed. All ewes were genotyped with a mastitis specific custom-made 960 single nucleotide polymorphism (SNP) array. We performed targeted genomic association studies, (co)variance component estimation and pathway enrichment analysis, and characterised gene expression levels and the extent of allelic expression imbalance. Presence of heritable variation for milk yield was confirmed. There was no significant genetic correlation between milk yield and mastitis traits. Environmental factors appeared to favour both milk production and udder health. There were no overlapping of SNPs associated with mastitis resistance and milk yield in Chios sheep. Furthermore, four distinct Quantitative Trait Loci (QTLs) affecting milk yield were detected on chromosomes 2, 12, 16 and 19, in locations other than those previously identified to affect mastitis resistance. Five genes (DNAJA1, GHR, LYPLA1, NUP35 and OXCT1) located within the QTL regions were highly expressed in both the mammary gland and milk transcriptome, suggesting involvement in milk synthesis and production. Furthermore, the expression of two of these genes (NUP35 and OXCT1) was enriched in immune tissues implying a potentially pleiotropic effect or likely role in milk production during udder infection, which needs to be further elucidated in future studies. In conclusion, the absence of genetic antagonism between milk yield and mastitis resistance suggests that simultaneous genetic improvement of both traits be achievable.
doi_str_mv 10.1371/journal.pone.0214346
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Mastitis is one of the most prevalent diseases, significantly impacting on animal welfare, milk yield and quality, while incurring substantial costs. Our objectives were to determine the feasibility of a concomitant genetic improvement programme for enhanced milk production and resistance to mastitis. Individual records for milk yield, and four mastitis-related traits (milk somatic cell count, California Mastitis Test score, total viable bacterial count in milk and clinical mastitis presence) were collected monthly throughout lactation for 609 ewes of the Chios breed. All ewes were genotyped with a mastitis specific custom-made 960 single nucleotide polymorphism (SNP) array. We performed targeted genomic association studies, (co)variance component estimation and pathway enrichment analysis, and characterised gene expression levels and the extent of allelic expression imbalance. Presence of heritable variation for milk yield was confirmed. There was no significant genetic correlation between milk yield and mastitis traits. Environmental factors appeared to favour both milk production and udder health. There were no overlapping of SNPs associated with mastitis resistance and milk yield in Chios sheep. Furthermore, four distinct Quantitative Trait Loci (QTLs) affecting milk yield were detected on chromosomes 2, 12, 16 and 19, in locations other than those previously identified to affect mastitis resistance. Five genes (DNAJA1, GHR, LYPLA1, NUP35 and OXCT1) located within the QTL regions were highly expressed in both the mammary gland and milk transcriptome, suggesting involvement in milk synthesis and production. Furthermore, the expression of two of these genes (NUP35 and OXCT1) was enriched in immune tissues implying a potentially pleiotropic effect or likely role in milk production during udder infection, which needs to be further elucidated in future studies. 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research</subject><subject>Genetics</subject><subject>Genomic analysis</subject><subject>Genomics</subject><subject>Goats</subject><subject>Lactation</subject><subject>Lactation - genetics</subject><subject>Lactation - physiology</subject><subject>Mammary gland</subject><subject>Mammary glands</subject><subject>Mastitis</subject><subject>Mastitis - genetics</subject><subject>Mastitis - veterinary</subject><subject>Medicine and Health Sciences</subject><subject>Milk</subject><subject>Milk production</subject><subject>Nucleotides</subject><subject>Oligonucleotide Array Sequence Analysis</subject><subject>Polymorphism</subject><subject>Polymorphism, Single Nucleotide</subject><subject>Quantitative genetics</subject><subject>Quantitative Trait Loci</subject><subject>Selective Breeding</subject><subject>Sheep</subject><subject>Sheep Diseases - genetics</subject><subject>Sheep, Domestic - classification</subject><subject>Sheep, Domestic - genetics</subject><subject>Sheep, Domestic - 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Raluca</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Genetic and genomic analyses underpin the feasibility of concomitant genetic improvement of milk yield and mastitis resistance in dairy sheep</atitle><jtitle>PloS one</jtitle><addtitle>PLoS One</addtitle><date>2019-11-25</date><risdate>2019</risdate><volume>14</volume><issue>11</issue><spage>e0214346</spage><pages>e0214346-</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><abstract>Milk yield is the most important dairy sheep trait and constitutes the key genetic improvement goal via selective breeding. Mastitis is one of the most prevalent diseases, significantly impacting on animal welfare, milk yield and quality, while incurring substantial costs. Our objectives were to determine the feasibility of a concomitant genetic improvement programme for enhanced milk production and resistance to mastitis. Individual records for milk yield, and four mastitis-related traits (milk somatic cell count, California Mastitis Test score, total viable bacterial count in milk and clinical mastitis presence) were collected monthly throughout lactation for 609 ewes of the Chios breed. All ewes were genotyped with a mastitis specific custom-made 960 single nucleotide polymorphism (SNP) array. We performed targeted genomic association studies, (co)variance component estimation and pathway enrichment analysis, and characterised gene expression levels and the extent of allelic expression imbalance. Presence of heritable variation for milk yield was confirmed. There was no significant genetic correlation between milk yield and mastitis traits. Environmental factors appeared to favour both milk production and udder health. There were no overlapping of SNPs associated with mastitis resistance and milk yield in Chios sheep. Furthermore, four distinct Quantitative Trait Loci (QTLs) affecting milk yield were detected on chromosomes 2, 12, 16 and 19, in locations other than those previously identified to affect mastitis resistance. Five genes (DNAJA1, GHR, LYPLA1, NUP35 and OXCT1) located within the QTL regions were highly expressed in both the mammary gland and milk transcriptome, suggesting involvement in milk synthesis and production. Furthermore, the expression of two of these genes (NUP35 and OXCT1) was enriched in immune tissues implying a potentially pleiotropic effect or likely role in milk production during udder infection, which needs to be further elucidated in future studies. In conclusion, the absence of genetic antagonism between milk yield and mastitis resistance suggests that simultaneous genetic improvement of both traits be achievable.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>31765378</pmid><doi>10.1371/journal.pone.0214346</doi><tpages>e0214346</tpages><orcidid>https://orcid.org/0000-0001-9341-2562</orcidid><orcidid>https://orcid.org/0000-0001-7271-7180</orcidid><orcidid>https://orcid.org/0000-0003-4095-1452</orcidid><oa>free_for_read</oa></addata></record>
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identifier ISSN: 1932-6203
ispartof PloS one, 2019-11, Vol.14 (11), p.e0214346
issn 1932-6203
1932-6203
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source MEDLINE; DOAJ Directory of Open Access Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; PubMed Central; Free Full-Text Journals in Chemistry; Public Library of Science (PLoS)
subjects Analysis
Animal lactation
Animal welfare
Animals
Antagonism
Apoptosis
Biology and Life Sciences
California mastitis test
Cattle
Chromosomes
Dairy industry
Dairy products industry
Dairying
EDTA
Environmental factors
Feasibility Studies
Female
Future predictions
Gene expression
Gene mapping
Genes
Genetic analysis
Genetic improvement
Genetic polymorphisms
Genetic research
Genetics
Genomic analysis
Genomics
Goats
Lactation
Lactation - genetics
Lactation - physiology
Mammary gland
Mammary glands
Mastitis
Mastitis - genetics
Mastitis - veterinary
Medicine and Health Sciences
Milk
Milk production
Nucleotides
Oligonucleotide Array Sequence Analysis
Polymorphism
Polymorphism, Single Nucleotide
Quantitative genetics
Quantitative Trait Loci
Selective Breeding
Sheep
Sheep Diseases - genetics
Sheep, Domestic - classification
Sheep, Domestic - genetics
Sheep, Domestic - physiology
Single nucleotide polymorphisms
Single-nucleotide polymorphism
Species Specificity
Udder
Veterinary colleges
Veterinary medicine
Yield
title Genetic and genomic analyses underpin the feasibility of concomitant genetic improvement of milk yield and mastitis resistance in dairy sheep
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