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According to current assemblies, avian genomes differ from those of the other lineages of amniotes in 1) containing a lower number of genes; 2) displaying a high stability of karyotype and recombination map; and 3) lacking any correlation between evolutionary rates (dN/dS) and life-history traits, unlike mammals and nonavian reptiles. We question the reality of the bird missing genes and investigate whether insufficient representation of bird gene content might have biased previous evolutionary analyses. Mining RNAseq data, we show that the vast majority of the genes missing from avian genome assemblies are actually present in most species of birds. These mainly correspond to the GC-rich fraction of the bird genome, which is the most difficult to sequence, assemble and annotate. With the inclusion of these genes in a phylogenomic analysis of high-quality alignments, we uncover a positive and significant correlation between the ratio of nonsynonymous to synonymous substitution rate (dN/dS) and life-history traits in Neoaves. We report a strong effect of GC-biased gene conversion on the dN/dS ratio in birds and a peculiar behavior of Palaeognathae (ostrich and allies) and Galloanserae (chickens, ducks and allies). Avian genomes do not contain fewer genes than mammals or nonavian reptiles. Previous analyses have overlooked ∼15% of the bird gene complement. GC-rich regions, which are the most difficult to access, are a key component of amniote genomes. They experience peculiar molecular processes and must be included for unbiased functional and comparative genomic analyses in birds.
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http://dx.doi.org/10.1093/molbev/msx236 | DOI Listing |
Poult Sci
December 2024
College of Animal Science and Technology, Henan Agricultural University, Zhengzhou 450002, PR China.; The Shennong Laboratory, Zhengzhou 450002, PR China.. Electronic address:
Chickens are vital economic poultry and serve as exemplary models for avian research. The incomplete reference genome of chickens and the limited availability of full-length cDNA impede the identification of alternatively spliced transcripts, thereby delaying many fundamental chicken studies. We utilized PacBio Iso-seq technology on various chicken tissues, obtaining 170,162 full-length transcripts through comprehensive transcriptome sequencing and annotation.
View Article and Find Full Text PDFPoult Sci
December 2024
Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu Province, PR China. Electronic address:
The emergence and dissemination of tigecyline resistant Enterobacterales (TRE) in animals is a critical issue. This study aimed to investigate the presence of TRE in the gut of healthy avians as well as meat samples. A total of 940 ceacal samples from 94 commercial poultry flocks were collected at slaughter and a total of 335 meat samples [(chicken (n = 159), turkey (n = 4) and beef/lamb (n = 172)] were collected from supermarkets and butcher shops.
View Article and Find Full Text PDFSci Data
December 2024
The Roslin Institute and Royal (Dick) School of Veterinary Studies, The University of Edinburgh, Easter Bush Campus, Midlothian, EH25 9RG, UK.
Bangladeshi indigenous chicken varieties - Common Deshi, Hilly and Naked Neck are notable for their egg production, meat quality, extraordinary survivability and disease resistance. However, the potential to harness their unique genetic merits are being eroded by various factors, including crossbreeding. In-depth genomic studies have not been carried out on these breeds so far.
View Article and Find Full Text PDFAvian Pathol
December 2024
The Sanya Institute of Nanjing Agricultural University, Yabulun Industrial Park, Yazhou Bay Science and Technology City, Sanya, 572024, China.
Avian pathogenic (APEC) is one of the major causes of poultry morbidity worldwide, severely reducing egg production and embryo hatchability in laying hens. Hainan Wenchang chicken is an important poultry breed in Hainan, China, and its culture has been affected by APEC for a long time. In this study, in order to investigate the causes of low hatchability and a large number of weak chicks during the breeding of Wenchang chicken, a total of 130 strains of APEC were isolated from 591 chicken embryo samples collected from five large-scale farms of Wenchang chicken in Hainan area.
View Article and Find Full Text PDFIntroduction: The late autumn epizootic of the highly pathogenic avian influenza virus (HPAIV) subtype H5N1 in Serbia in 2023 caused massive mortality in the migratory population of common cranes (). This is the first time HPAIV has been identified in the common crane in Serbia, leading to mass mortality of this bird species.
Methods: To understand the pathological impact of HPAIV in cranes, we evaluated the pathological changes in the tissues of common cranes.
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