Publications by authors named "Wu Yajiang"

Gibbons are small, arboreal apes that play a critical role in tropical biodiversity and ecosystem ecology. However, nearly all species of gibbons are threatened by habitat loss, illegal trade, hunting, and other human activities. Long-term poor understanding of their genetics and evolution undermines effective conservation efforts.

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The traditional concept of "tonic food" and demand for traditional Chinese medicine make pangolins the largest population of illegally smuggled mammals in the world. Illegal hunting and trade are not only responsible for the sharp decline in pangolin populations but also provide conditions for pathogenic transmission. In 2021, we rescued 21 confiscated unhealthy Malayan pangolins, none of which survived.

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Paramyxoviruses are important pathogens affecting various animals, including mammals and humans. Parainfluenza virus 5 (PIV5)-a member of the family -is a major threat to the health of mammals and humans. However, studies on terrestrial wild animals infected with PIV5 are scanty.

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Pangolins are susceptible to a variety of gastrointestinal nematodes due to their burrowing lifestyle and feeding habits, and few parasitic nematodes have been reported. Here, a Chinese pangolin with old wounds on its leg and tail was rescued from the Heyuan City, Guangdong Province. The cox1 and SSU rRNA of the worms from the intestine of the Chinese pangolin had the highest sequence identity of 89.

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The world faces significant challenges in preserving the diversity of vertebrate species due to wildlife crimes. DNA barcoding, an effective molecular marker for insufficient nuclear DNA, is an authentic and quick identification technique to trace the origin of seized samples in forensic investigations. Here, we present a multiplex assay capable of identifying twenty vertebrate wildlife species utilizing twenty species-specific primers that target short fragments of the mitochondrial , , , and genes.

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Article Synopsis
  • Island endemic birds, like the Swinhoe's pheasant, represent a significant portion of recent vertebrate extinctions, but their evolutionary traits remain poorly understood.
  • This study assembled a high-quality genome for the Swinhoe's pheasant, revealing rapid chromosome rearrangements and natural selection favoring genes linked to reproduction and body size—key factors for island adaptation.
  • Comparisons with the closely related silver pheasant showed more genetic drift and inbreeding in the Swinhoe's pheasant, highlighting the unique demographic histories shaped by island versus mainland climates during the last glacial period and emphasizing the need for genetic conservation efforts.
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  • - The study reveals that 12 species of macaques originated from a hybridization event between two ancestral groups around 3.45 to 3.56 million years ago, which is a rare case of hybrid speciation in animals.
  • - It found that the X chromosomes and low-recombination regions had equal parental lineage contributions, indicating they maintained the hybrid characteristics effectively, which is important for hybrid species integrity.
  • - The research also identified reproduction-related genes that may contribute to the unique sexual traits of macaques and confirmed that all Western macaque species are vulnerable to HIV-1 infection, providing new insights into their evolutionary history.
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Malayan pangolin SARS-CoV-2-related coronavirus (SARSr-CoV-2) is closely related to SARS-CoV-2. However, little is known about its pathogenicity in pangolins. Using CT scans we show that SARSr-CoV-2 positive Malayan pangolins are characterized by bilateral ground-glass opacities in lungs in a similar manner to COVID-19 patients.

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  • A study examined 27 families of mammalian viruses from 1,981 wild animals and 194 zoo animals in South China, isolating and characterizing 8 viruses over 7 years.
  • Bats were found to carry a wide variety of viruses, including coronaviruses, picornaviruses, and potentially new virus genera, indicating a high viral diversity.
  • The research highlighted the risk of virus transmission between wildlife and domestic animals, emphasizing the complexities of wildlife protection and disease control efforts.
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  • The South China tiger, once widely distributed, is now extinct in the wild, with all living members stemming from a small group of just six original tigers captured decades ago.
  • Recent research revealed two distinct genomic lineages among these tigers, indicating some level of genetic diversity despite concerns about inbreeding and hybridization with other tiger subspecies.
  • The study highlighted a successful genetic purging of harmful mutations, suggesting effective management of the species' genetic health, and contributes valuable genomic data for future conservation efforts.
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Mesenchymal stem cells (MSCs) are multipotent adult stem cells and can be isolated from many tissues of the body. Due to their potentials to treat various diseases and be applied in animal breeding, MSCs have been isolated and identified regarding their biological properties. Common hippos (Hippopotamus amphibius) are a vulnerable species and yet the cryopreservation of their genetic materials is scare.

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Background: Raillietina species belong to the family Davaineidae, which parasitizes in a wide variety of mammals and birds, causing stunted growth, lethargy, emaciation, and digestive tract obstruction. However, only a limited number of Raillietina species have been identified in wild animals.

Methods: We analyzed and annotated the complete mitochondrial (mt) genome of a worm from the intestine of a wild pangolin using Illumina sequencing of whole genomic DNA.

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This work was the first to report twelve natural estrogens (NEs) in the urines of six threatened or endangered mammalians in a Zoo Park of Guangzhou (i.e., panda, gorilla, elephant, African lion, jaguar, and leopard).

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Background: Ancylostoma species are hematophagous parasites that cause chronic hemorrhage in various animals and humans. Pangolins, also known as scaly anteaters, are mammals that live in soil environments where they are readily exposed to soil-borne parasitic nematodes. However, only a limited number of helminth species have been identified in this animal host so far.

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Pangolins are among the most critically endangered animals due to widespread poaching and worldwide trafficking. Captive breeding is considered to be one way to protect them and increase the sizes of their populations. However, comparative studies of captive and wild pangolins in the context of gut microbiota are rare.

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Opportunistic feeding and multiple other environment factors can modulate the gut microbiome, and bias conclusions, when wild animals are used for studying the influence of phylogeny and diet on their gut microbiomes. Here, we controlled for these other confounding factors in our investigation of the magnitude of the effect of diet on the gut microbiome assemblies of nonpasserine birds. We collected fecal samples, at one point in time, from 35 species of birds in a single zoo as well as 6 species of domestic poultry from farms in Guangzhou city to minimize the influences from interfering factors.

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Due to habitat destruction and illegal hunting and trade, the number of pangolins has been sharply reduced. To protect pangolins from extinction, relevant departments are combined and active action have been taken. A total of 21 confiscated Malayan pangolins were rescued in 2019, but died continuously for unknown reasons.

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Despite the substantial role that chickens have played in human societies across the world, both the geographic and temporal origins of their domestication remain controversial. To address this issue, we analyzed 863 genomes from a worldwide sampling of chickens and representatives of all four species of wild jungle fowl and each of the five subspecies of red jungle fowl (RJF). Our study suggests that domestic chickens were initially derived from the RJF subspecies Gallus gallus spadiceus whose present-day distribution is predominantly in southwestern China, northern Thailand and Myanmar.

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Article Synopsis
  • * Research identified a new coronavirus, pangolin-CoV, from Malayan pangolins that shares high genetic similarity to SARS-CoV-2, indicating pangolins could be intermediate hosts for the virus.
  • * The presence of pangolin-CoV in infected pangolins, along with concerns about wildlife trafficking, highlights a potential public health risk if effective controls are not implemented.
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Objectives: There are large populations of indigenous horse () in China and some other parts of East Asia. However, their matrilineal genetic diversity and origin remained poorly understood. Using a combination of mitochondrial DNA (mtDNA) and hypervariable region (HVR-1) sequences, we aim to investigate the origin of matrilineal inheritance in these domestic horses.

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In this study, we sequenced the complete mitochondrial genome (mitogenome) of the Thai Red Junglefowl (RJF; Gallus gallus) using the next-generation sequencing (NGS) platform of the Ion Torrent PGM. Samples were taken from Mae Wang District, Chiang Mai Province, northern Thailand. Our data showed the complete mitogenome to be 16 785 bp in length, composed by 13 protein-coding genes, 22 tRNA genes, two rRNA genes, and one control region.

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In this study, we sequenced the complete mitochondrial DNA genome (mitogenome) of the Zhengyang Yellow chicken () by next-generation sequencing technology. Samples were taken from Zhumadian city, Henan Province, China. The complete mitogenome was 16 785 bp in size, and had a nucleotide composition of 30.

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