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Published on: November 12, 2015
Molecular phylogeny of human adenovirus type 41 lineages
Jasper Götting1, Anne K Cordes1, Lars Steinbrück1
1Institute of Virology, Hannover Medical School, Carl-Neuberg-Str. 1, Hannover 30625, Germany.
Insights
Human adenovirus species F type 41 (HAdV-F41) shows significant evolution, particularly in Lineage 3, impacting its tropism and virulence. This study details HAdV-F41
Area of Science:
- Virology
- Molecular Biology
- Genetics
Background:
- Human adenovirus species F type 41 (HAdV-F41) is a common cause of childhood gastroenteritis.
- Recent associations with severe pediatric hepatitis have increased interest in HAdV-F41.
- Limited studies have explored the evolutionary dynamics of HAdV-F41.
Purpose of the Study:
- To investigate the phylogenetic evolution of HAdV-F41.
- To analyze genomic variations within HAdV-F41 lineages.
- To understand potential impacts of evolutionary changes on HAdV-F41 characteristics.
Main Methods:
- Generation of complete HAdV-F41 genomic sequences from diagnostic specimens (2011-2022).
- Inclusion of existing HAdV-F41 genomes from GenBank for phylogenetic analysis.
- Phylogenetic analysis of 65 HAdV-F41 genomes to identify lineages and evolutionary patterns.
Main Results:
- Phylogenetic analysis revealed three co-circulating HAdV-F41 lineages.
- Lineage 3, first described in 2009, showed significant evolution, including a deletion in the long fiber gene.
- A 2022 Lineage 3 isolate exhibited recombinant phylogeny in the short fiber gene, indicating ongoing evolution.
Conclusions:
- HAdV-F41 has evolved into distinct lineages with significant genetic changes, especially in Lineage 3.
- Alterations in fiber genes and E3 region of Lineage 3 may influence cellular tropism and virulence.
- Further research is needed to understand the clinical implications of HAdV-F41 evolution, particularly concerning recent hepatitis cases.
Abstract:
Type 41 of human adenovirus species F (HAdV-F41) is a frequent aetiology of gastroenteritis in children, and nosocomial as well as kindergarten outbreaks have been frequently described. In contrast to other HAdV types, HAdV-F41 was not associated with a life-threatening disseminated disease in allogeneic haematopoietic stem cell transplant (HSCT) recipients or any severe organ infections so far. Due to the limited clinical significance, the evolution of HAdV-F41 has not been studied in detail. Recently, HAdV-F41 has been associated with severe hepatitis in young children, and interest in HAdV-F41 has skyrocketed, although the aetiology of hepatitis has not been resolved. Complete genomic HAdV-F41 sequences from thirty-two diagnostic specimens of the past 11 years (2011-22) were generated, all originating from gastroenteritis patients. Additionally, thirty-three complete HAdV-F41 genomes from GenBank were added to our phylogenetic analysis. Phylogenetic analysis of sixty-five genomes indicated that HAdV-F41 evolved with three lineages co-circulating. Lineage 1 included the prototype 'Tak' from 1973 and six isolates from 2007 to 2017 with an average nucleotide identity of 99.3 per cent. Lineage 2 included 53 isolates from 2000 to 2022, had an average nucleotide identity of 99.8 per cent, and split into two sublineages. Lineage 3, probably described for the first time in 2009, had a 45-nucleotide deletion in the long fibre gene and had evolved significantly in the short fibre and E3 region. Moreover, a recent Lineage 3 isolate from 2022 had a recombinant phylogeny of the short fibre gene. Fibres interact with cellular receptors and determine cellular tropism, whereas E3 gene products interfere with the immune recognition of HAdV-infected cells. This in-depth study on the phylogeny of HAdV-F41 discovered significant evolution of recently described Lineage 3 of HAdV-F41, possibly resulting in altered cellular tropism, virulence, and pathophysiology.
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