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Wei J, Brophy B, Cole SA, Leath S, Oback B, Boch J, Wells DN, Laible G. Production of light-coloured, low heat-absorbing Holstein Friesian cattle by precise embryo-mediated genome editing. Reprod Fertil Dev 2023; 36:112-123. [PMID: 38064192 DOI: 10.1071/rd23163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2023] Open
Abstract
CONTEXT Genome editing enables the introduction of beneficial sequence variants into the genomes of animals with high genetic merit in a single generation. This can be achieved by introducing variants into primary cells followed by producing a live animal from these cells by somatic cell nuclear transfer cloning. The latter step is associated with low efficiencies and developmental problems due to incorrect reprogramming of the donor cells, causing animal welfare concerns. Direct editing of fertilised one-cell embryos could circumvent this issue and might better integrate with genetic improvement strategies implemented by the industry. METHODS In vitro fertilised zygotes were injected with TALEN editors and repair template to introduce a known coat colour dilution mutation in the PMEL gene. Embryo biopsies of injected embryos were screened by polymerase chain reaction and sequencing for intended biallelic edits before transferring verified embryos into recipients for development to term. Calves were genotyped and their coats scanned with visible and hyperspectral cameras to assess thermal energy absorption. KEY RESULTS Multiple non-mosaic calves with precision edited genotypes were produced, including calves from high genetic merit parents. Compared to controls, the edited calves showed a strong coat colour dilution which was associated with lower thermal energy absorbance. CONCLUSIONS Although biopsy screening was not absolutely accurate, non-mosaic, precisely edited calves can be readily produced by embryo-mediated editing. The lighter coat colouring caused by the PMEL mutation can lower radiative heat gain which might help to reduce heat stress. IMPLICATIONS The study validates putative causative sequence variants to rapidly adapt grazing cattle to changing environmental conditions.
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Affiliation(s)
- Jingwei Wei
- Animal Biotechnology, Ruakura Research Centre, AgResearch, Hamilton, New Zealand
| | - Brigid Brophy
- Animal Biotechnology, Ruakura Research Centre, AgResearch, Hamilton, New Zealand
| | - Sally-Ann Cole
- Animal Biotechnology, Ruakura Research Centre, AgResearch, Hamilton, New Zealand
| | - Shane Leath
- Animal Biotechnology, Ruakura Research Centre, AgResearch, Hamilton, New Zealand
| | - Björn Oback
- Animal Biotechnology, Ruakura Research Centre, AgResearch, Hamilton, New Zealand; and School of Sciences, University of Waikato, Hamilton, New Zealand; and Department of Molecular Medicine and Pathology, School of Medical Sciences, University of Auckland, Auckland, New Zealand
| | - Jens Boch
- Institute of Plant Genetics, Leibniz Universität Hannover, Hannover, Germany
| | - David N Wells
- Animal Biotechnology, Ruakura Research Centre, AgResearch, Hamilton, New Zealand
| | - Götz Laible
- Animal Biotechnology, Ruakura Research Centre, AgResearch, Hamilton, New Zealand; and Department of Molecular Medicine and Pathology, School of Medical Sciences, University of Auckland, Auckland, New Zealand
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2
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Agerholm JS, Madsen SE, Krogh AKH, Najafzadeh V, Secher JBM. Health assessment of Holstein calves born after in vitro fertilization, biopsy-based genotyping at the blastocyst stage and subsequent embryo transfer. Theriogenology 2023; 211:76-83. [PMID: 37595376 DOI: 10.1016/j.theriogenology.2023.08.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Revised: 08/07/2023] [Accepted: 08/07/2023] [Indexed: 08/20/2023]
Abstract
Establishing methods for evaluating genomic estimated breeding values of bovine embryos can potentially increase the efficiency of breeding programs by transferring only embryos with a high genomic estimated breeding value. This may be achieved by analyzing DNA from trophectoderm biopsies. However, manipulation of bovine embryos is associated with a risk of impaired conceptus health. More knowledge on the health implications of embryonic handling procedures is required. In this study, we followed pregnancies after transfer of in vitro-produced (IVP) embryos and assessed the health of the offspring during the first 2 weeks of life. Three groups of calves were studied: i) freshly transferred non-biopsied embryos (39 transfers, 17 calves; Group B-/C-); ii) biopsied and freshly transferred IVP embryos (42 transfers, 21 calves; Group B+/C-); iii) biopsied and cryopreserved IVP embryos (17 transfers, 6 calves; Group B+/C+). Blood biochemical and hematologic values were compared between groups and to a control group of 13 calves produced by conventional artificial insemination. The pregnancy rate on day 50 and the calving rate did not differ among the groups, but the average gestation length of the B+/C+ group was significantly shorter and with wider variation than the two other groups. There was a tendency toward a higher average body weight at birth in group B+/C+ (45.1 kg) and the standard deviation in body weight was larger (11.7 kg) compared to the B-/C- (39.5 kg; 3.2 kg) and B+/C- (41.8 kg; 6 kg) groups. Body weight on day 14 was higher in the B+/C+ calves compared to the other groups. There was no difference in the biochemical and hematological values at birth between the groups and these were within the normal range. However, when compared to a group of calves produced by standard artificial insemination, significantly higher concentrations were found for the hepatic-related enzymes ALAT, ASAT, ALP, and GGT in group B-/C-and B+/C-, while only higher ALP concentrations were found in B+/C+ calves. The biochemical findings indicate higher heterogeneity in IVP calves compared to calves produced by artificial insemination. The more manipulated IVP embryos also showed increased heterogeneity in body weight at birth, with a shift toward heavier calves, which calls for closer attendance at parturition to handle dystocia in a timely manner and minimize fetal losses.
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Affiliation(s)
- Jørgen Steen Agerholm
- Section for Veterinary Reproduction and Obstetrics, Department of Veterinary Clinical Sciences, University of Copenhagen, Højbakkegaard Allé 5A, 2630, Taastrup, Denmark.
| | | | - Anne Kirstine Havnsøe Krogh
- Section for Medicine, Oncology and Veterinary Clinical Pathology, Department of Veterinary Clinical Sciences, University of Copenhagen, Dyrlægevej 16, 1870, Frederiksberg C, Denmark.
| | - Vahid Najafzadeh
- Department of Veterinary and Animal Sciences, University of Copenhagen, 1870, Frederiksberg C, Denmark.
| | - Jan Bojsen-Møller Secher
- Section for Veterinary Reproduction and Obstetrics, Department of Veterinary Clinical Sciences, University of Copenhagen, Højbakkegaard Allé 5A, 2630, Taastrup, Denmark.
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Oliveira CS, Camargo LSA, da Silva MVGB, Saraiva NZ, Quintão CC, Machado MA. Embryo biopsies for genomic selection in tropical dairy cattle. Anim Reprod 2023; 20:e20230064. [PMID: 37547565 PMCID: PMC10399131 DOI: 10.1590/1984-3143-ar2023-0064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 06/21/2023] [Indexed: 08/08/2023] Open
Abstract
Genomic selection has transformed the livestock industry, enabling early-life selection of animals. Biopsy sampling of pre-implantation embryos has been described since 1968. However, it was only after 2010, with the advancement of molecular biology techniques such as whole genomic amplification and SNP Chips, that next-generation sequencing became commercially available for bovine embryos. It is now possible to make decisions about which embryos to transfer not only based on recipients' availability or embryo morphology but also on genomic estimates. This technology can be implemented for a wide spectrum of applications in livestock. In this review, we discuss the use of embryo biopsy for genomic selection and share our experience with Gir and Girolando Brazilian breeding programs, as well as future goals for implementing it in Brazilian bovine in vitro embryo production practices.
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Zoda A, Ogawa S, Kagawa R, Tsukahara H, Obinata R, Urakawa M, Oono Y. Single-Step Genomic Prediction of Superovulatory Response Traits in Japanese Black Donor Cows. BIOLOGY 2023; 12:biology12050718. [PMID: 37237533 DOI: 10.3390/biology12050718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 05/11/2023] [Accepted: 05/12/2023] [Indexed: 05/28/2023]
Abstract
We assessed the performance of single-step genomic prediction of breeding values for superovulatory response traits in Japanese Black donor cows. A total of 25,332 records of the total number of embryos and oocytes (TNE) and the number of good embryos (NGE) per flush for 1874 Japanese Black donor cows were collected during 2008 and 2022. Genotype information on 36,426 autosomal single-nucleotide polymorphisms (SNPs) for 575 out of the 1,874 cows was used. Breeding values were predicted exploiting a two-trait repeatability animal model. Two genetic relationship matrices were used, one based on pedigree information (A matrix) and the other considering both pedigree and SNP marker genotype information (H matrix). Estimated heritabilities of TNE and NGE were 0.18 and 0.11, respectively, when using the H matrix, which were both slightly lower than when using the A matrix (0.26 for TNE and 0.16 for NGE). Estimated genetic correlations between the traits were 0.61 and 0.66 when using H and A matrices, respectively. When the variance components were the same in breeding value prediction, the mean reliability was greater when using the H matrix than when using the A matrix. This advantage seems more prominent for cows with low reliability when using the A matrix. The results imply that introducing single-step genomic prediction could boost the rate of genetic improvement of superovulatory response traits, but efforts should be made to maintain genetic diversity when performing selection.
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Affiliation(s)
- Atsushi Zoda
- Research and Development Group, Zen-noh Embryo Transfer Center, Kamishihoro 080-1407, Japan
| | - Shinichiro Ogawa
- Division of Meat Animal and Poultry Research, Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization (NARO), Tsukuba 305-0901, Japan
| | - Rino Kagawa
- Research and Development Group, Zen-noh Embryo Transfer Center, Kamishihoro 080-1407, Japan
| | - Hayato Tsukahara
- Research and Development Group, Zen-noh Embryo Transfer Center, Kamishihoro 080-1407, Japan
| | - Rui Obinata
- Research and Development Group, Zen-noh Embryo Transfer Center, Kamishihoro 080-1407, Japan
| | - Manami Urakawa
- Research and Development Group, Zen-noh Embryo Transfer Center, Kamishihoro 080-1407, Japan
| | - Yoshio Oono
- Research and Development Group, Zen-noh Embryo Transfer Center, Kamishihoro 080-1407, Japan
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5
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Oliveira CS, Silva MVGBD, Quintão CC, Otto PI, Alonso RV, Feres LF, Panetto JCDC, Machado MA, Camargo LSDA. Imputation accuracy for genomic selection using embryo biopsy samples in Gir. Reprod Biol 2023; 23:100765. [PMID: 37150127 DOI: 10.1016/j.repbio.2023.100765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 04/09/2023] [Accepted: 04/10/2023] [Indexed: 05/09/2023]
Abstract
The aim of this study was to establish a platform for genomic selection of in vitro-fertilized (IVF) Gir embryos. Multiple displacement amplification (MDA)-based embryo biopsy samples were genotyped, and genomic estimated breeding values (GEBV) for milk yield (305MY) were calculated. The concordance of GEBV and accuracy between embryo biopsies and the respective liveborn were assessed. Imputation was performed using two panels (Z-Chip and Bovine HD, Illumina) based on a database of 73,110 lactating cow's database and pedigree files from 147,131 animals. Biopsied embryos had similar pregnancy rates (39% vs 40%), pregnancy loss rates (18% vs 20%), and pregnancy length compared to Control embryos. After genotyping, low call rate means were detected for biopsy samples compared to the respective calf samples (0.80 vs 0.98). Imputation presented 0.83 (Z-Chip) and 0.96 (HD) accuracy (CORRanim). Embryo GEBV accuracy levels were higher in BovineHD imputation (0.82) than Z-Chip imputation (0.55) or no imputation (0.62), and the correlation between embryo/calf pairs' accuracy was 0.85 for BovineHD imputation, 0.11 for Z-Chip imputation, and 0.02 for no imputation. GEVB estimates correlation between embryo/calf pairs was 0.87 for BovineHD imputation, 0.80 for Z-Chip imputation, and 0.41 before imputation. The call rate of embryo samples did not affect the correlation between embryo/calf pairs for accuracy and GEBV before and after BovineHD imputation. Embryos obtained on the same farm presented GEBV 305MY differences of up to 800 kg, emphasizing the expected impact of embryo genomic selection for the Gir breed.
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Affiliation(s)
- Clara Slade Oliveira
- Embrapa Dairy Cattle, 610 Eugenio do Nascimento Ave., Juiz de Fora, MG 36038-330, Brazil.
| | | | | | - Pamela Itajara Otto
- Embrapa Dairy Cattle, 610 Eugenio do Nascimento Ave., Juiz de Fora, MG 36038-330, Brazil; Department of Animal Science, Universidade Federal de Santa Maria, 1000 Roraima Ave., Santa Maria, RS 97105-900, Brazil
| | | | - Luiz Fernando Feres
- Jose do Rosario Vellano University (UNIFENAS), MG 179Rd., Alfenas, MG 37132-440, Brazil
| | | | - Marco Antonio Machado
- Embrapa Dairy Cattle, 610 Eugenio do Nascimento Ave., Juiz de Fora, MG 36038-330, Brazil
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6
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Zoda A, Kagawa R, Obinata R, Urakawa M, Oono Y, Ogawa S, Uemoto Y, Satoh M. Genetic relationship between superovulatory response traits and carcass traits in Japanese Black cattle. Anim Sci J 2022; 93:e13731. [PMID: 35537852 DOI: 10.1111/asj.13731] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 03/30/2022] [Accepted: 04/07/2022] [Indexed: 11/30/2022]
Abstract
We estimated the genetic correlations between superovulatory response traits and carcass traits in Japanese Black cattle. As regards the superovulatory response traits in cows, we analyzed the phenotypic records of the total number of embryos and oocytes (TNE) and the number of good embryos (NGE) collected from 1532 donors between 2008 and 2018. As regards the carcass traits in fattened animals, we analyzed the phenotypic records for cold carcass weight, rib eye area, rib thickness, subcutaneous fat thickness, estimated yield percent, and marbling score for 1448 progenies derived from 596 donors and slaughtered between 2004 and 2020. Variance components were estimated using single-trait and two-trait animal models and the restricted maximum likelihood approach. The estimated genetic correlations with the carcass traits ranged from -0.05 to 0.04 for TNE and from -0.14 to 0.04 for NGE, and their standard errors ranged from 0.10 to 0.14. These results imply that the genetic relationship between the superovulatory response traits in Japanese Black donor cows and the carcass traits in their fattened progenies was weak to negligible. Therefore, we concluded that selecting donors with superior genetic ability for superovulatory responses would not have antagonistic effects on carcass performance in their fattened progenies.
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Affiliation(s)
- Atsushi Zoda
- Research and Development Group, Zen-noh Embryo Transfer Center, Kamishihoro, Hokkaido, Japan.,Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi, Japan
| | - Rino Kagawa
- Research and Development Group, Zen-noh Embryo Transfer Center, Kamishihoro, Hokkaido, Japan
| | - Rui Obinata
- Research and Development Group, Zen-noh Embryo Transfer Center, Kamishihoro, Hokkaido, Japan
| | - Manami Urakawa
- Research and Development Group, Zen-noh Embryo Transfer Center, Kamishihoro, Hokkaido, Japan
| | - Yoshio Oono
- Research and Development Group, Zen-noh Embryo Transfer Center, Kamishihoro, Hokkaido, Japan
| | - Shinichiro Ogawa
- Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi, Japan.,Division of Meat Animal and Poultry Research, Institute of Livestock and Grassland Science, NARO, Tsukuba, Ibaraki, Japan
| | - Yoshinobu Uemoto
- Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi, Japan
| | - Masahiro Satoh
- Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi, Japan
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7
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Ogawa S, Matsuda H, Taniguchi Y, Watanabe T, Sugimoto Y, Iwaisaki H. Estimation of the autosomal contribution to total additive genetic variability of carcass traits in Japanese Black cattle. Anim Sci J 2022; 93:e13710. [PMID: 35416392 DOI: 10.1111/asj.13710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 02/18/2022] [Accepted: 03/18/2022] [Indexed: 11/29/2022]
Abstract
We attempted to estimate the additive genetic variance explained by each autosome, using genotype data of 33,657 single nucleotide polymorphism (SNP) markers in 2271 Japanese Black fattened steers. Traits were cold carcass weight, ribeye area, rib thickness, subcutaneous fat thickness, estimated yield percentage, and marbling score. Two mixed linear models were used: One is that (model 1) incorporating a genomic relationship matrix (G matrix) constructed by using all available SNPs, and another (model 2), incorporating two G matrices constructed by using the SNPs on one autosome and using those on the remaining autosomes. Genomic heritabilities estimated using model 1 were moderate to high. The sums of the proportions of the additive genetic variance explained by each autosome to the total genetic variance estimated by using model 2 were >90%. For carcass weight, the proportions explained by Bos taurus autosomes 6, 8, and 14 were higher than those explained by the remaining autosomes. In some cases, the estimated proportion was close to 0. The results obtained from model 2 could provide a novel insight into the genetic architecture, such as heritability per chromosome, of carcass traits in Japanese Black cattle, although further careful investigation would be required.
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Affiliation(s)
| | | | - Yukio Taniguchi
- Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | | | - Yoshikazu Sugimoto
- Shirakawa Institute of Animal Genetics, Japan Livestock Technology Association, Tokyo, Japan
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Rajawat D, Panigrahi M, Kumar H, Nayak SS, Parida S, Bhushan B, Gaur GK, Dutt T, Mishra BP. Identification of important genomic footprints using eight different selection signature statistics in domestic cattle breeds. Gene 2022; 816:146165. [PMID: 35026292 DOI: 10.1016/j.gene.2021.146165] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Revised: 12/13/2021] [Accepted: 12/20/2021] [Indexed: 12/25/2022]
Abstract
In the present study, the population genomic data of different cattle breeds were explored to decipher the genomic regions affected due to selective events and reflected in the productive, reproductive, thermo-tolerance, and health-related traits. To find out these genomic deviations due to selective sweeps, we used eight different statistical tools (Tajima's D, Fu & Li's D*, CLR, ROH, iHS, FST, FLK, and hapFLK) on seven indigenous and five exotic cattle breeds. We further performed composite analysis by comparing their covariance matrix. Several candidate genes were found to be related to milk production (ADARB, WDR70, and CA8), reproductive (PARN, FAM134B2, and ZBTB20), and health-related traits (SP110, CXCL2, CLXCL3, CXCL5, IRF8, and MYOM1). The outcome of this investigation provides a basis for detecting selective sweeps that explain the genetic variation of traits. They may possess functional importance for multiple cattle breeds in different subcontinents. However, further studies are required to improve the findings using high-density arrays or whole-genome sequencing with higher resolution and greater sample sizes.
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Affiliation(s)
- Divya Rajawat
- Division of Animal Genetics, Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, UP, India
| | - Manjit Panigrahi
- Division of Animal Genetics, Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, UP, India.
| | - Harshit Kumar
- Division of Animal Genetics, Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, UP, India
| | - Sonali Sonejita Nayak
- Division of Animal Genetics, Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, UP, India
| | - Subhashree Parida
- Division of Pharmacology & Toxicology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, UP, India
| | - Bharat Bhushan
- Division of Animal Genetics, Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, UP, India
| | - G K Gaur
- Division of Animal Genetics, Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, UP, India
| | - Triveni Dutt
- Livestock Production and Management Section, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, UP, India
| | - B P Mishra
- Division of Animal Biotechnology, Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, UP, India
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Komiya R, Ogawa S, Aonuma T, Satoh M. Performance of using opposing homozygotes for paternity testing in Japanese Black cattle. J Anim Breed Genet 2021; 139:113-124. [PMID: 34499371 DOI: 10.1111/jbg.12649] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 08/20/2021] [Accepted: 09/01/2021] [Indexed: 11/30/2022]
Abstract
Genome-wide single nucleotide polymorphism (SNP) markers in Japanese Black cattle enable genomic prediction and verifying parent-offspring relationships. We assessed the performance of opposing homozygotes (OH) for paternity testing in Japanese Black cattle, using SNP genotype information of 50 sires and 3,420 fattened animals, 1,945 of which were fathered by the 50 genotyped sires. The number of OH was counted for each sire-progeny pair in 28,764 SNPs with minor allele frequencies of ≥0.05 in this population. Across all pairs of animals, the number of OH tended to increase as the pedigree-based coefficient of relationship decreased. With a threshold of 288 (1% of SNPs) for paternity testing, most sire-progeny pairs were detected as true relationships. The frequency of Mendelian inconsistencies was 2.4%, reflecting the high accuracy of pedigree information in Japanese Black cattle population. The results indicate the utility of OH for paternity testing in Japanese Black cattle.
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Affiliation(s)
- Ryota Komiya
- Faculty of Agriculture, Tohoku University, Sendai, Japan
| | - Shinichiro Ogawa
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Tatsuya Aonuma
- Miyagi Prefectural Livestock Experiment Station, Osaki, Japan
| | - Masahiro Satoh
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
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10
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Silvestri G, Canedo-Ribeiro C, Serrano-Albal M, Labrecque R, Blondin P, Larmer SG, Marras G, Tutt DA, Handyside AH, Farré M, Sinclair KD, Griffin DK. Preimplantation Genetic Testing for Aneuploidy Improves Live Birth Rates with In Vitro Produced Bovine Embryos: A Blind Retrospective Study. Cells 2021; 10:cells10092284. [PMID: 34571932 PMCID: PMC8465548 DOI: 10.3390/cells10092284] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 08/29/2021] [Accepted: 08/30/2021] [Indexed: 12/31/2022] Open
Abstract
Approximately one million in vitro produced (IVP) cattle embryos are transferred worldwide each year as a way to improve the rates of genetic gain. The most advanced programmes also apply genomic selection at the embryonic stage by SNP genotyping and the calculation of genomic estimated breeding values (GEBVs). However, a high proportion of cattle embryos fail to establish a pregnancy. Here, we demonstrate that further interrogation of the SNP data collected for GEBVs can effectively remove aneuploid embryos from the pool, improving live births per embryo transfer (ET). Using three preimplantation genetic testing for aneuploidy (PGT-A) approaches, we assessed 1713 cattle blastocysts in a blind, retrospective analysis. Our findings indicate aneuploid embryos have a 5.8% chance of establishing a pregnancy and a 5.0% chance of given rise to a live birth. This compares to 59.6% and 46.7% for euploid embryos (p < 0.0001). PGT-A improved overall pregnancy and live birth rates by 7.5% and 5.8%, respectively (p < 0.0001). More detailed analyses revealed donor, chromosome, stage, grade, and sex-specific rates of error. Notably, we discovered a significantly higher incidence of aneuploidy in XY embryos and, as in humans, detected a preponderance of maternal meiosis I errors. Our data strongly support the use of PGT-A in cattle IVP programmes.
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Affiliation(s)
- Giuseppe Silvestri
- School of Biosciences, University of Kent, Canterbury CT2 7NH, UK; (G.S.); (C.C.-R.); (M.S.-A.); (A.H.H.); (M.F.)
| | - Carla Canedo-Ribeiro
- School of Biosciences, University of Kent, Canterbury CT2 7NH, UK; (G.S.); (C.C.-R.); (M.S.-A.); (A.H.H.); (M.F.)
| | - María Serrano-Albal
- School of Biosciences, University of Kent, Canterbury CT2 7NH, UK; (G.S.); (C.C.-R.); (M.S.-A.); (A.H.H.); (M.F.)
| | - Remi Labrecque
- L’Alliance Boviteq Inc., Saint-Hyacinthe, QC J2T 5H1, Canada; (R.L.); (P.B.); (S.G.L.); (G.M.)
| | - Patrick Blondin
- L’Alliance Boviteq Inc., Saint-Hyacinthe, QC J2T 5H1, Canada; (R.L.); (P.B.); (S.G.L.); (G.M.)
| | - Steven G. Larmer
- L’Alliance Boviteq Inc., Saint-Hyacinthe, QC J2T 5H1, Canada; (R.L.); (P.B.); (S.G.L.); (G.M.)
| | - Gabriele Marras
- L’Alliance Boviteq Inc., Saint-Hyacinthe, QC J2T 5H1, Canada; (R.L.); (P.B.); (S.G.L.); (G.M.)
| | - Desmond A.R. Tutt
- School of Biosciences, University of Nottingham, Nottingham LE12 5RD, UK; (D.A.R.T.); (K.D.S.)
| | - Alan H. Handyside
- School of Biosciences, University of Kent, Canterbury CT2 7NH, UK; (G.S.); (C.C.-R.); (M.S.-A.); (A.H.H.); (M.F.)
| | - Marta Farré
- School of Biosciences, University of Kent, Canterbury CT2 7NH, UK; (G.S.); (C.C.-R.); (M.S.-A.); (A.H.H.); (M.F.)
| | - Kevin D. Sinclair
- School of Biosciences, University of Nottingham, Nottingham LE12 5RD, UK; (D.A.R.T.); (K.D.S.)
| | - Darren K. Griffin
- School of Biosciences, University of Kent, Canterbury CT2 7NH, UK; (G.S.); (C.C.-R.); (M.S.-A.); (A.H.H.); (M.F.)
- Correspondence:
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11
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Fujii T, Naito A, Moriyasu S, Kageyama S. Potential of preimplantation genomic selection using the blastomere separation technique in bovine in vitro fertilized embryos. J Reprod Dev 2021; 67:155-159. [PMID: 33642516 PMCID: PMC8075726 DOI: 10.1262/jrd.2020-153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
Preimplantation genomic selection combined with an in vitro embryo production system is expected as a means of accelerating genetic
improvement in cattle. While micromanipulation-based biopsy approaches are often used to collect embryonic cells for genetic testing, they require expensive
equipment and sophisticated skills, hindering the adoption of this system. In the present study, to develop a simple method for preimplantation genomic
selection using the blastomere separation (BS) technique in bovine in vitro fertilized embryos, we examined the accuracy of single nucleotide
polymorphism (SNP) genotyping and optimal cryopreservation method in demi-blastocysts produced by the BS technique. We demonstrated reliable SNP genotyping
using DNA derived from demi-blastocysts. We indicated a suitable equilibrium time in vitrification solution for demi-blastocysts and succeeded obtaining
pregnancies by the transfer of vitrified demi-blastocysts. In conclusion, our findings suggest that the BS technique provides a simple method for
preimplantation genomic selection in bovine in vitro fertilized embryos.
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Affiliation(s)
- Takashi Fujii
- Animal Research center, Hokkaido Research Organization, Hokkaido 081-0038, Japan
| | - Akira Naito
- Animal Research center, Hokkaido Research Organization, Hokkaido 081-0038, Japan
| | - Satoru Moriyasu
- Animal Research center, Hokkaido Research Organization, Hokkaido 081-0038, Japan
| | - Soichi Kageyama
- Animal Research center, Hokkaido Research Organization, Hokkaido 081-0038, Japan.,Dairy Research center, Hokkaido Research Organization, Hokkaido 086-1135, Japan
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