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Measuring the human T cell receptor gamma-chain locus.
Science (New York, N.Y.)
|September 4, 1987
Summary
The human T cell receptor gamma locus undergoes gene rearrangement during T cell development. This study maps the locus and reveals deletions ranging from 50 to 145 kilobases, impacting the gamma-chain peptide repertoire.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- The human T cell receptor gamma locus comprises variable, joining, and constant gene segments within 160 kilobases.
- T cell somatic development involves gene rearrangement through deletion of intervening sequences.
Purpose of the Study:
- To molecularly map the human T cell receptor gamma locus.
- To define the extent of gene deletions during functional gamma-chain gene formation.
- To provide a structural basis for understanding gamma-chain peptide repertoire development.
Main Methods:
- Deletion mapping and restriction mapping were employed to define the locus.
- Standard agarose electrophoresis and field inversion electrophoresis were used to resolve restriction fragments.
Main Results:
- The complete molecular map of the T cell receptor gamma locus was established.
- Deletions during functional gamma-chain gene formation were quantified, ranging from 50 to 145 kilobases.
- The study demonstrated the utility of pulsed-field gel electrophoresis in analyzing large DNA fragments.
Conclusions:
- The structural characterization of the T cell receptor gamma locus provides insights into gamma-chain peptide repertoire generation.
- The findings highlight the significant genomic alterations occurring during T cell development.
- This research validates and extends the application of advanced electrophoretic techniques in genomic studies.