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Analysis of the H-2Kbm8 mutant: correlation of structure with function
G M Pfaffenbach1, H Uehara, J Geliebter
1Department of Cell Biology and Microbiology/Immunology, Albert Einstein College of Medicine, Bronx, NY 10461.
Molecular Immunology
|July 1, 1991
Summary
The H-2Kbm8 mutation involves seven DNA changes, altering four amino acids. The Q4 gene is identified as a likely source for this complex mutation in major histocompatibility complex class I genes.
Area of Science:
- Immunogenetics
- Molecular Biology
- Genomics
Background:
- The H-2K gene encodes a major histocompatibility antigen crucial for immune responses.
- The bm8 variant presents a unique mutation within the H-2K gene, requiring investigation into its origin.
Purpose of the Study:
- To clone and sequence the H-2K gene from the bm8 variant.
- To identify the genetic source of the observed mutation in the H-2Kbm8 variant.
Main Methods:
- DNA sequencing of the H-2K gene from the bm8 variant and its parental gene.
- Genomic Southern analysis using gene-specific oligonucleotides.
Main Results:
- Sequence analysis revealed seven nucleotide changes in a 24-nucleotide region, resulting in four amino acid alterations.
- The Q4 gene, a class I-like molecule, showed 95 nucleotides of identity in the mutation region.
- Genomic Southern analysis supported Q4 as the likely donor gene for the H-2Kbm8 mutation.
Conclusions:
- The H-2Kbm8 mutation arose from a complex genetic event, likely involving gene conversion or similar mechanisms.
- The Q4 gene is identified as a probable source of the genetic material for the H-2Kbm8 mutation.
- Understanding these mutations provides insights into major histocompatibility complex (MHC) evolution and immune system diversity.