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Mutational analysis of transforming growth factor-beta receptor type II and Smad3 tumor suppressor genes in

Hidetoshi Ikeda1

  • 1Department of Neurosurgery, Kohnan Hospital, Sendai, Japan. ikeda@nsg.med.tohoku.ac.jp

Brain Tumor Pathology
|December 21, 2007
PubMed

Insights

Gene abnormalities in human prolactinomas were investigated. Researchers found common single nucleotide polymorphisms, not active mutations, in transforming growth factor-beta receptor type II and Smad3 genes, suggesting careful interpretation of peripheral blood analysis for drug sensitivity.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Genetics

Background:

  • Prolactinomas are pituitary tumors often associated with gene alterations.
  • Transforming growth factor-beta (TGF-β) signaling pathways, involving TGF-β receptor type II and Smad3, are crucial in cell growth and differentiation.
  • Understanding genetic changes in prolactinomas is essential for diagnosis and treatment.

Purpose of the Study:

  • To investigate the presence of gene abnormalities in the transforming growth factor-beta receptor type II (TGFBR2) and Smad3 genes in human prolactinomas.
  • To differentiate between benign polymorphisms and active mutations in these genes within tumor tissues and peripheral blood.
  • To assess the implications of these findings for estimating drug sensitivity based on peripheral blood analysis.

Main Methods:

  • Single-strand conformation polymorphism (SSCP) screening was employed to detect gene abnormalities in tumor and peripheral blood samples from 14 prolactinoma patients.
  • Direct sequencing was performed on exons of TGFBR2 and Smad3 genes showing band shifts in SSCP analysis.
  • Analysis focused on identifying single nucleotide polymorphisms (SNPs) and distinguishing them from causative mutations.

Main Results:

  • A common single nucleotide polymorphism (SNP) (rs2228048) was identified in exon 4 of the TGFBR2 gene, with an allele frequency of G:0.817 and A:0.183. Seven patients exhibited a G to A base substitution.
  • A common SNP (rs1065080) was identified in exon 2 of the Smad3 gene, with an allele frequency of C:0.947 and T:0.053. Four patients exhibited a C to T base substitution.
  • In some cases, base substitutions were observed in peripheral blood, aligning with neoplastic transformation, but no active mutations were found in either gene.

Conclusions:

  • The study identified common SNPs in TGFBR2 and Smad3 genes in prolactinomas, rather than active mutations.
  • The presence of these SNPs in peripheral blood requires careful consideration when estimating drug sensitivity of pituitary adenomas.
  • Further research is needed to clarify the functional impact of these genetic variations in prolactinoma development and treatment response.

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