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Complementary DNA (cDNA) sequence of baboon tumor necrosis factor alpha
1Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas 75235-9063, USA.
Molecular Immunology
|March 6, 1998
Summary
Baboons exhibit lower lipopolysaccharide (LPS) sensitivity than humans due to distinct tumor necrosis factor-alpha (TNFa) gene sequences. This research details the baboon TNFa sequence, revealing key differences that may explain varying immune responses.
Area of Science:
- Immunology
- Genetics
- Comparative Biology
Background:
- Lipopolysaccharide (LPS) is a potent immune activator.
- Tumor necrosis factor-alpha (TNFa) is a critical mediator in LPS-induced immune responses.
- Differences in LPS sensitivity exist between species, notably between baboons and humans.
Purpose of the Study:
- To investigate the genetic basis for differential LPS sensitivity between baboons and humans.
- To clone and sequence the baboon tumor necrosis factor-alpha (TNFa) cDNA.
- To compare the baboon TNFa sequence with the human TNFa sequence.
Main Methods:
- Cloning and sequencing of baboon TNFa cDNA.
- Bioinformatic analysis comparing baboon and human TNFa sequences (coding region and 3' UTR).
- Amino acid sequence comparison.
Main Results:
- The baboon TNFa protein coding region shows 97% homology with the human sequence.
- The baboon 3' untranslated region (UTR) exhibits 89% homology to the human sequence.
- Ten amino acid differences were predicted between baboon and human TNFa; 'TA'-rich motifs in the 3' UTR were 100% homologous.
Conclusions:
- The identified sequence variations in baboon TNFa may contribute to their reduced LPS sensitivity compared to humans.
- Comparative analysis of TNFa provides insights into species-specific immune response variations.
- Further research is warranted to elucidate the functional impact of these TNFa sequence differences on immune regulation.