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Organization patterns of the AGFG genes: an evolutionary study.
Maria Antonietta Panaro1, Angela Acquafredda, Rosa Calvello
1CIMAOL, University of Bari, Bari, Italy. ma.panaro@anatomia.uniba.it
Immunopharmacology and Immunotoxicology
|February 3, 2011
Summary
The evolution of Rev-binding proteins (AGFGs) reveals a conserved "core module" across species, with AGFG2 emerging later in mammals and exhibiting unique, less conserved sequences. This study traces AGFG evolution through mRNA analysis.
Area of Science:
- Molecular Biology
- Evolutionary Biology
- Virology
Background:
- Human immunodeficiency virus type 1 (HIV-1) replication requires viral proteins translated from unspliced pre-mRNAs.
- The viral protein Rev facilitates the transport of these unspliced mRNAs to the cytosol.
- Rev requires cellular co-factors, including Rev-binding proteins of the AGFG family (Arf-GAP domain and FG repeats-containing proteins).
Purpose of the Study:
- To investigate the evolutionary history of AGFG proteins.
- To analyze the conserved and variable regions within AGFG coding sequences across different species.
Main Methods:
- Analysis of the initial coding sequences of AGFG mRNAs.
- Comparative analysis of nucleotide sequences to identify conserved modules and evolutionary divergence.
Main Results:
- A conserved
- core module
- in AGFG coding sequences is traceable from Drosophila to mammals.
- AGFG1 conservation from Drosophila to primates is estimated at 67%.
- AGFG2, found only in mammals, likely arose from AGFG1 duplication and possesses an additional, less conserved module (54% conservation).
- A re-edited form of the AGFG1 core module was observed in Gallus gallus (birds).
Conclusions:
- The AGFG protein family exhibits a conserved evolutionary history marked by a core module.
- AGFG2 represents a later evolutionary development in mammals with distinct sequence characteristics.
- Intra-species variation, such as in birds, highlights ongoing evolutionary processes within the AGFG family.
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