Spumaretroviruses: Research and Applications

A special issue of Viruses (ISSN 1999-4915). This special issue belongs to the section "Animal Viruses".

Deadline for manuscript submissions: 1 March 2026 | Viewed by 1441

Special Issue Editors


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Center for Biologics Research and Evaluation, U. S. Food and Drug Administration, 10903 New Hampshire Ave., Bldg. 72–52, Room 1216, Silver Spring, MD 20993-0002, USA
Interests: retrovirus biology and genomics; in vitro models for virus-host interactions; SIV monkey models; viral vaccines; high-throughput sequencing; bioinformatics; novel virus discovery
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Instituto Nacional de Câncer Rua André Cavalcanti, 37–4o Andar Bairro de Fátima, Rio de Janeiro 20231-050, Brazil
Interests: oncovirology; retrovirology; virus-host interactions; retrolement expression in cancer; HIV and cancer

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Guest Editor
Institute of Medical Microbiology and Virology, Technische Universität Dresden, Fetscherstr. 74, 01307 Dresden, Germany
Interests: virus—host interactions; molecular and cellular biology of retroviruses; development and application of retroviral vector systems
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Cancer Research Center (DKFZ), Research Program Infection, Inflammation and Cancer, Department of Virus-Associated Carcinogenesis (F170), Im Neuenheimer Feld 242, D-69120 Heidelberg, Germany
Interests: virus—host interactions; molecular and cellular biology of retroviruses in vitro and in vivo; foamy virus vector systems for gene delivery and antigen presentation; infection, inflammation, and cancer

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Guest Editor
Fundamental Microbiology and Pathogenicity Lab (MFP), UMR 5234 CNRS–University of Bordeaux, SBM Department, F-33076 Bordeaux, France
Interests: structural biology of host-retrovirus interactions

Special Issue Information

Dear Colleagues,

Spumaretroviruses (generally called foamy viruses (FVs)), belonging to the subfamily Spumaretrovirinae, are complex retroviruses with unique features in their replication that set them apart from the majority of the “conventional” members of the Orthoretrovirinae subfamily. Evolutionary studies have revealed that FVs are the most ancient retroviruses, with endogenous elements present in the five major classes of vertebrates (mammals, birds, reptiles, amphibians and fish). Exogenous FVs circulate and co-speciate with their mammalian hosts such as non-human primates, bovines, equines, and felines, and inter-species infections can occur. Furthermore, cross-species infections can occur in humans through exposure to infected non-human primates. The co-existence of FVs with their hosts and the potential of FVs as co-pathogens are topics of intense investigation, as are the interactions of FVs with innate immunity and immune recognition and evasion. The FV molecular biology is unique and provides exciting insights into the breadth of retrovirus replication strategies. Additionally, FVs are an excellent model organism for retroviruses in general; in fact, the first atomic structure of the intasome complex containing full-length retroviral integrase was from a prototype FV and serves as a blueprint for corresponding investigations in other retroelements. Due to their apparent lack of pathogenicity and other features such as their broad tropism, FVs are engineered as novel vectors for gene therapy, vaccine antigen expression, and targeted protein and RNA transfer.

This Special Issue aims to provide new insights and a comprehensive overview of all aspects of FV biology including molecular and cell biology, genomics, virus–host interactions, molecular evolution, epidemiology, structural biology, gene therapy vectors, and translational research. We cordially invite you to contribute original papers and review articles on these and related topics to highlight recent advances in spumaretrovirus research.

Dr. Arifa S. Khan
Dr. Marcelo A. Soares
Dr. Dirk Lindemann
Dr. Martin Löchelt
Dr. Paul Lesbats
Guest Editors

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Keywords

  • ancient retroviruses
  • antivirals
  • complex retroviruses
  • endogenous elements
  • foamy viruses
  • foamy virus-host interactions
  • foamy virus prevalence
  • foamy virus vectors
  • immune responses
  • molecular biology and replication
  • natural infections
  • nonhuman primates and non-primates
  • restriction factors spumaretroviruses
  • structural biology
  • taxonomy
  • viral proteins
  • virus detection assays
  • zoonoses

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Published Papers (2 papers)

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16 pages, 1622 KiB  
Article
Simian Foamy Virus Prevalence and Evolutionary Relationships in Two Free-Living Lion Tamarin Populations from Rio de Janeiro, Brazil
by Déa Luiza Girardi, Thamiris Santos Miranda, Matheus Augusto Calvano Cosentino, Caroline Carvalho de Sá, Talitha Mayumi Francisco, Bianca Cardozo Afonso, Flávio Landim Soffiati, Suelen Sanches Ferreira, Silvia Bahadian Moreira, Alcides Pissinatti, Carlos Ramon Ruiz-Miranda, Valéria Romano, Marcelo Alves Soares, Mirela D’arc and André Felipe Santos
Viruses 2025, 17(8), 1072; https://doi.org/10.3390/v17081072 - 31 Jul 2025
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Abstract
Simian foamy virus (SFV) is a retrovirus that infects primates. However, epidemiological studies of SFV are often limited to captive populations. The southeastern Brazilian Atlantic Forest is home to both an endemic, endangered species, Leontopithecus rosalia, and an introduced species, Leontopithecus chrysomelas [...] Read more.
Simian foamy virus (SFV) is a retrovirus that infects primates. However, epidemiological studies of SFV are often limited to captive populations. The southeastern Brazilian Atlantic Forest is home to both an endemic, endangered species, Leontopithecus rosalia, and an introduced species, Leontopithecus chrysomelas, to which no data on SFV exist. In this study, we assessed the molecular prevalence of SFV, their viral load, and their phylogenetic relationship in these two species of primates. Genomic DNA was extracted from 48 oral swab samples of L. chrysomelas and 102 of L. rosalia. Quantitative PCR (qPCR) was performed to diagnose SFV infection and quantify viral load. SFV prevalence was found to be 23% in L. chrysomelas and 33% in L. rosalia. No age-related differences in prevalence were observed; however, L. rosalia showed a higher mean viral load (3.27 log10/106 cells) compared to L. chrysomelas (3.03 log10/106 cells). The polymerase gene sequence (213 pb) of L. rosalia (SFVlro) was clustered within a distinct SFV lineage found in L. chrysomelas. The estimated origin of SFVlro dated back approximately 0.0836 million years ago. Our study provides the first molecular prevalence data for SFV in free-living Leontopithecus populations while offering insights into the complex evolutionary history of SFV in American primates. Full article
(This article belongs to the Special Issue Spumaretroviruses: Research and Applications)
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10 pages, 1037 KiB  
Conference Report
Thirteenth International Foamy Virus Conference—Meeting Report
by Arifa S. Khan, Martin Löchelt, Florence Buseyne, Ottmar Herchenröder, Dirk Lindemann, William M. Switzer, André F. A. Santos and Marcelo A. Soares
Viruses 2025, 17(8), 1071; https://doi.org/10.3390/v17081071 - 31 Jul 2025
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Abstract
The 13th International Foamy Virus (FV) Conference was held from 8 to 10 November 2023 at the BioParque/Zoological Garden in Rio de Janeiro, Brazil. This was the first conference on spumaretroviruses to be held in the Southern Hemisphere and in the unique environment [...] Read more.
The 13th International Foamy Virus (FV) Conference was held from 8 to 10 November 2023 at the BioParque/Zoological Garden in Rio de Janeiro, Brazil. This was the first conference on spumaretroviruses to be held in the Southern Hemisphere and in the unique environment of the rainforest. New developments and current perspectives in FV research were presented. Highlights of the conference included the structural biology of the envelope protein (Env) and insights into its function and evolution, epidemiologic identification of Amazonian indigenous people with a high prevalence of simian FV (SFV) infections, investigations of virus biology and genomics using synthetic FV DNAs, studies of humoral immune response, and development and applications of SFV vectors. The last day of the meeting was a special tour of the Centro de Primatologia do Rio de Janeiro, located northeast of Rio de Janeiro amidst the protected rainforest, where New World primate hosts of spumaretroviruses are rescued and studied. Our report summarizes the meeting highlights and outcomes for future discussions. Full article
(This article belongs to the Special Issue Spumaretroviruses: Research and Applications)
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