Chromosomal approaches to hematopoietic oncogenesis

Area of Science:

• Cancer Genetics
• Hematologic Malignancies
• Molecular Oncology

Background:

• Cytogenetic studies are crucial for understanding the genetic basis of human leukemias and lymphomas.
• Chromosome translocations play a significant role in the development of lymphoid and myeloid tumors.
• Identifying altered genes and their functions is key to unraveling cancer development.

Purpose of the Study:

• To identify genes involved in human leukemias and lymphomas.
• To elucidate the "mutational" mechanisms leading to altered gene function in these cancers.
• To explore the application of molecular data in clinical diagnosis and therapy development.

Main Methods:

• Molecular dissection of chromosome translocations in lymphoid and myeloid tumors.
• Investigating the involvement of specific genes like c-myc and abl oncogene.
• Analyzing chromosomal deletions to identify tumor suppressor genes.

Main Results:

• Demonstrated involvement of the c-myc gene in B cell and T cell tumors via association with immunoglobulin or T cell receptor loci.
• Identified over a dozen novel "oncogenes" in lymphoid tumors activated by translocation or fusion events.
• Dissected the Philadelphia chromosome translocation in myeloid leukemias, revealing abl oncogene involvement.
• Identified other known and novel genes in translocations characterizing myeloid leukemias.
• Extended studies to search for tumor suppressor genes associated with chromosomal deletions.

Conclusions:

• Cytogenetic and molecular studies have significantly advanced the understanding of gene involvement in leukemias and lymphomas.
• Molecular data derived from these studies are increasingly valuable for clinical diagnosis and patient management.
• While numerous genes are implicated, the complexity suggests no single therapeutic solution, but potential for targeted therapies.