Related Experiment Videos
Band 3, the anion transporter, is conserved during evolution: implications for aging and vertebrate evolution
M M Kay1, C Cover, S F Schluter
1Department of Microbiology and Immunology, College of Medicine, University of Arizona, Tucson 85724, USA.
Cellular and Molecular Biology (Noisy-Le-Grand, France)
|September 1, 1995
Summary
Researchers identified a band 3 anion transporter in lampreys, the earliest vertebrates. This discovery, supported by gene expression and antibody-like molecule binding, suggests a conserved role for band 3 in vertebrates.
Area of Science:
- Molecular Biology
- Evolutionary Biology
- Biochemistry
Background:
- The band 3 protein is a major anion transporter crucial in higher vertebrates.
- Its presence and function in the earliest vertebrate lineages (agnathostomes) remain largely unexplored.
Purpose of the Study:
- To investigate the existence and potential function of a band 3-like transporter in lampreys, representing the most primitive jawless vertebrates.
- To explore the evolutionary conservation of the band 3 protein.
Main Methods:
- Cloning of a cDNA fragment for the band 3 protein from lamprey mRNA using PCR homology probing.
- Semi-quantitative PCR to assess gene expression levels.
- Analysis of lamprey serum for antibody-like molecules binding to band 3 peptides.
Main Results:
- Successfully cloned a cDNA fragment homologous to the highly conserved region of the band 3 protein in lampreys.
- Demonstrated band 3-like transporter expression in lampreys, comparable to higher vertebrates.
- Identified antibody-like molecules in lamprey serum that bind to senescent cell antigen peptides of band 3.
Conclusions:
- This study provides the first evidence of a band 3-like transporter in agnathostomes (lampreys).
- The conserved sequence and functional interactions suggest a comparable role for lamprey band 3 to that in higher vertebrates.
- The findings shed light on the early evolution of essential cellular transport mechanisms.