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Ig VH gene expression among human follicular lymphomas
D W Bahler1, M J Campbell, S Hart
1Department of Medicine, Stanford University School of Medicine, CA.
Blood
|September 15, 1991
Summary
Follicular lymphoma (FL) utilizes immunoglobulin heavy chain variable region (VH) genes similarly to normal cells, but shows nonrandom selection of specific gene segments. This suggests a targeted B-cell receptor development in FL pathogenesis.
Area of Science:
- Immunology
- Oncology
- Molecular Biology
Background:
- Follicular lymphoma (FL) is a common B-cell malignancy.
- Understanding the immunoglobulin heavy chain variable region (VH) gene repertoire in FL is crucial for elucidating its pathogenesis.
Purpose of the Study:
- To analyze the VH gene family usage and specific gene expression in low-grade FL.
- To compare the VH gene repertoire in FL with that of normal lymphocytes and fetal repertoires.
Main Methods:
- Polymerase chain reaction (PCR)-based technique using family-specific leader primers for VH gene family assignment.
- Sequencing of VH genes from the VH4 and VH3 families in FL cases.
- Comparison of FL-derived VH sequences with known germline and fetal repertoire sequences.
Main Results:
- VH family usage in FL mirrors that of normal peripheral blood lymphocytes, correlating with VH family size.
- A nonrandom usage of JH3, JH4, and JH5 joining segments was observed in FL.
- FL-derived VH3 sequences did not appear to represent genes preferentially used in the fetal repertoire.
Conclusions:
- FL exhibits a VH gene usage pattern similar to normal B-cells but with specific biases in joining segment selection.
- The findings suggest potential selection pressures on the B-cell receptor in FL development.
- Further investigation into the preferential use of specific VH genes and their role in FL pathogenesis is warranted.