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Absence of somatic changes in p21 gene in non-Hodgkin's lymphoma and chronic myelogenous leukemia

J Z Gong1, H Zhou, Z Hu

  • 1Cancer Genetics Laboratory, North Shore University Hospital-Cornell University Medical College, Manhasset, NY 11030, USA.

Hematologic Pathology
|January 1, 1995
PubMed

Insights

This study investigated mutations in the p21 gene within lymphoma and leukemia tumors. Researchers found no evidence that p21 coding region mutations contribute to these cancers.

Area of Science:

  • Molecular Biology
  • Oncology
  • Genetics

Background:

  • The p21 gene plays a crucial role in cell cycle arrest following DNA damage, mediated by the p53 pathway.
  • p21 functions by inhibiting cyclin-dependent kinases (CDKs) or binding to proliferating-cell nuclear antigen (PCNA).

Purpose of the Study:

  • To investigate the presence and significance of p21 gene mutations in human tumors.
  • To determine if alterations in the p21 coding region contribute to the development of non-Hodgkin's B-cell lymphoma (NHL) and chronic myelogenous leukemia (CML).

Main Methods:

  • DNA from 188 NHL and 84 CML samples were analyzed for mutations in the p21 coding region.
  • Methods included single-strand conformation polymorphism (SSCP) analysis and direct sequencing of polymerase chain reaction (PCR)-amplified DNA.
  • Normal control DNA (97 samples) was used for comparison.

Main Results:

  • No mutations were detected in the coding regions of p21 in either NHL or CML samples.
  • A polymorphism at codon 31 (C to A substitution) was found in three NHL tumors but not in CML or controls.
  • A single CML case exhibited a codon 64 transition (G to A).

Conclusions:

  • The coding region of the p21 gene does not appear to be significantly altered in the studied NHL and CML patient cohorts.
  • The identified genetic variations in p21 are unlikely to be major drivers in the initiation or progression of these specific hematological malignancies.

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