Evolutionary Dynamics and Age-Dependent Pathogenesis of Sub-Genotype VI.2.1.1.2.2 PPMV-1 in Pigeons

Pigeon paramyxovirus type 1 (PPMV-1) infection causes high morbidity in pigeons, resulting in a significant burden to the poultry industry. In this study, we isolated three PPMV-1 strains from diseased pigeons collected in Guangdong Province, South China, from June 2017 to April 2019. Genetic analysis revealed that these three PPMV-1 strains and most of the PPMV-1 strains isolated from China after 2011 were clustered into sub-genotype VI.2.1.1.2.2. Our Bayesian analysis revealed that the VI.2.1.1.2.2 viruses might have originated in Europe. Phylogeographic analyses revealed that East and South China might have played a key role in seeding the VI.2.1.1.2.2 PPMV-1 epidemic in China. To characterize the effect of age at infection on the outcome of PPMV-1 infection in pigeons, we investigated the pathogenesis and transmission of the pigeon/Guangdong/GZ08/2017 (GZ08) virus in 3-, 6-, and 12-week-old pigeons. Two of six 12-week-old pigeons inoculated with GZ08 survived, and all of the 3- and 6-week-pigeons inoculated with GZ08 died. Moreover, the GZ08 virus could be transmitted to 3-, 6-, and 12-week-old naïve contact pigeons. The lethality of the GZ08 virus through contact with 3-, 6-, and 12-week-old pigeons was 100%, 66.7%, and 0%, respectively, suggesting that the transmissibility of the GZ08 virus was stronger in young pigeons. These findings demonstrated that East and South China was the epicenter for dissemination of VI.2.1.1.2.2 PPMV-1, and age at infection has an impact on the outcome of PPMV-1 infection in pigeons.

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Biological Characterization and Evolutionary Dynamics of Pigeon Paramyxovirus Type 1 in China

Frontiers in Veterinary Science ◽

10.3389/fvets.2021.721102 ◽

2021 ◽

Vol 8 ◽

Author(s):

Tiansong Zhan ◽

Dongchang He ◽

Xiaolong Lu ◽

Tianxing Liao ◽

Wenli Wang ◽

...

Keyword(s):

Phylogenetic Analysis ◽

South China ◽

Host Preference ◽

Evolutionary Dynamics ◽

East China ◽

Economic Losses ◽

Biological Characterization ◽

Antigenic Variant ◽

Pigeon Paramyxovirus Type 1

Pigeon paramyxovirus type 1 (PPMV-1) is considered as an antigenic variant of Newcastle disease virus (NDV) which has an obvious host preference for pigeons and has caused significant economic losses to the global poultry industry. The evolutionary dynamics of PPMV-1 in China, however, are poorly understood. In this study, we characterized seven PPMV-1 isolates from diseased pigeons collected in Jiangsu, Anhui, and Henan provinces during 2020. Phylogenetic analysis revealed that seven isolates belonged to sub-genotype VI.2.1.1.2.2. Biological characterization indicated that seven isolates were mesogenic based on the mean death time (69.6–91.2 h) and intracerebral pathogenicity index (1.19–1.40) and had similar growth kinetics in chicken embryos and CEFs. Furthermore, the four representative viruses (AH/01/20/Pi, JS/06/20/Pi, HN/01/20/Pi, and HN/02/20/Pi) could result in marked cytopathic effects (CPE) in CEFs and induced syncytium formation in Vero cells. Our Bayesian phylogenetic analysis showed that PPMV-1 might first emerge in East China in 1974 and East China had the highest genotypic diversity of PPMV-1. Besides, phylogeographic analysis indicated that East China and South China were probably the major epicenters of dissemination of PPMV-1 in China. Selection pressure analysis and amino acid substitutions analysis revealed that the viral replication complex (NP, P, and L proteins) was likely related with the host preference of PPMV-1. Collectively, this study uncovered the epidemiology and evolutionary dynamics of PPMV-1 circulating in China, emphasizing the importance of strengthening the monitoring of PPMV-1 in East China and South China and providing significant clues for further studies on the molecular mechanism underlying host preference of PPMV-1.

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Host Avian Beta-Defensin and Toll-Like Receptor Responses of Pigeons following Infection with Pigeon Paramyxovirus Type 1

Applied and Environmental Microbiology ◽

10.1128/aem.01413-15 ◽

2015 ◽

Vol 81 (18) ◽

pp. 6415-6424 ◽

Cited By ~ 11

Author(s):

Yanyan Li ◽

Qianqian Xu ◽

Tingting Zhang ◽

Mengying Gao ◽

Qiuling Wang ◽

...

Keyword(s):

Bursa Of Fabricius ◽

Host Responses ◽

High Morbidity ◽

Toll Like Receptor ◽

Host Defense Peptides ◽

Cecal Tonsil ◽

Immune Related Genes ◽

Pigeon Paramyxovirus Type 1

ABSTRACTThe high morbidity and mortality in pigeons caused by pigeon paramyxovirus type 1 (PPMV-1) highlights the need for new insights into the host immune response and novel treatment approaches. Host defense peptides (HDPs) are key components of the innate immune system. In this study, three novel avian β-defensins (AvBDs 2, 7, and 10) were characterized in pigeons and shown to possess direct antiviral activity against PPMV-1in vitro. In addition, we evaluated the mRNA expression of these AvBDs and other immune-related genes in tissues of 2-month-old infected pigeons at 3 and 7 days postinfection. We observed that the expression of AvBD2 in the cecal tonsil, lungs, and proventriculus, as well as the expression of AvBD10 in the spleen, lungs, proventriculus, and kidneys, was upregulated in infected pigeons. Similarly, the expression of both Toll-like receptor 3 (TLR3) and TLR7 was increased in the spleen, trachea, and proventriculus, while TLR15 expression was increased only in the lungs of infected pigeons. In addition, inducible nitric oxide synthase (iNOS) expression was upregulated in the spleen, the bursa of Fabricius, the trachea, and the proventriculus of infected pigeons. Furthermore, we observed a high correlation between the expression of AvBD2 and the expression of either TLR7 or TLR15, as well as between AvBD10 expression and either TLR3 or TLR7 expression in respective tissues. The results suggest that PPMV-1 infection can induce innate host responses characterized by the activation of TLRs, particularly TLR3 and TLR7, AvBDs (2 and 10), and iNOS in pigeons.

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Genetic analysis of human immunodeficiency virus type 1 and 2 (HIV-1 and HIV-2) mixed infections in India reveals a recent spread of HIV-1 and HIV-2 from a single ancestor for each of these viruses.

Journal of Virology ◽

10.1128/jvi.68.4.2161-2168.1994 ◽

1994 ◽

Vol 68 (4) ◽

pp. 2161-2168 ◽

Cited By ~ 98

Author(s):

M Grez ◽

U Dietrich ◽

P Balfe ◽

H von Briesen ◽

J K Maniar ◽

...

Keyword(s):

Human Immunodeficiency Virus ◽

Genetic Analysis ◽

Human Immunodeficiency Virus Type ◽

Virus Type ◽

Mixed Infections ◽

Immunodeficiency Virus ◽

Hiv 1

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Central precocious puberty in a girl with LEGIUS syndrome: an accidental association?

Italian Journal of Pediatrics ◽

10.1186/s13052-021-01004-9 ◽

2021 ◽

Vol 47 (1) ◽

Author(s):

Valentina Orlandi ◽

Paolo Cavarzere ◽

Laura Palma ◽

Rossella Gaudino ◽

Franco Antoniazzi

Keyword(s):

Genetic Analysis ◽

Precocious Puberty ◽

Central Precocious Puberty ◽

Neurofibromatosis Type ◽

Case Presentation ◽

New Variant ◽

Legius Syndrome ◽

Timing Of Puberty ◽

First Time

Abstract Background Central precocious puberty is a condition characterized by precocious activation of the hypothalamic-pituitary-gonadal axis. It may be idiopathic or secondary to organic causes, including syndromes such as Neurofibromatosis type 1 (NF1). Case presentation We presented a girl of 6 years and 10 months with almost 11 café-au-lait skin macules, without other clinical or radiological signs typical of NF1, and with a central precocious puberty. Genetic analysis evidenced the new variant NM-152594.2:c.304delAp. (Thr102Argfs*19) in SPRED1 gene, which allowed to diagnose Legius syndrome. Conclusions We report for the first time a case of central precocious puberty in a girl with Legius syndrome. The presence of central precocious puberty in a child with characteristic café-au-lait macules should suggest pediatricians to perform genetic analysis in order to reach a definitive diagnosis. Further studies on timing of puberty in patients with RASopathies are needed to better elucidate if this clinical association is casual or secondary to their clinical condition.

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