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SMAD4 Gene Analysis in Patients with Early Onset Colorectal Cancer: A Pilot Study

Abstract

In colorectal cancer (CRC), inactivation of SMAD4 occurs early in the disease development and SMAD4 represents one of key driver genes in progression and metastasis. Loss of SMAD4 protein expression is a relatively common feature of sporadic colorectal cancers, and it was observed to be even more frequent in tumors of patients with early onset disease and also more frequent in microsatellite stable tumors. Pathogenic variants in the SMAD4 gene are usually missense or nonsense mutations, and they are more frequent in the C-terminal domain. The aim of this study was to perform genetic analysis of SMAD4 C-terminal domain in colorectal cancer patients with early onset disease and microsatellite stable tumors. This pilot study was conducted with a purpose of investigating if such genetic screening strategy would be useful for diagnostic purposes in this specific subgroup of CRC patients. The study was conducted in a selected set of DNA samples extracted from the tumors of CRC patients who had less than 50 years at the time of diagnosis. Genetic analysis of C-terminal domain has encompassed analysis of exons 9, 10, 11 and 12 of the SMAD4 gene by PCR and direct DNA sequencing. Among the twenty analyzed tumor DNAs, one sample was found to harbor a SMAD4 variant: NC_000018.9:g.48591918C > T; (NM005359.5: c.1081C > T; Arg361Cys). The variant was discovered in exon 9, affecting the codon 361, which represents a mutational hot spot within the SMAD4 gene. This variant was discovered in homozygous state in the tumor of a 47 yr old female with T3 stage carcinoma of the right colon. Considering the incidence and functional consequences of SMAD4 exon 9 variants, the screening of this region could be a useful low cost strategy for the genetic analysis of colorectal tumors from patients with early onset disease, as well as for susceptibility testing.

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Funding

This study was supported by the grant 451-03-68/2020-14/200042 of the Ministry of Education, Science and Technological Development of the Republic of Serbia.

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Correspondence to Aleksandra Nikolic.

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Conflict of interest. The authors declare that they have no conflicts of interest.

Statement of compliance with standards of research involving humans as subjects. The study was conducted in compliance with principles of ethical research involving humans. The study was approved by the Ethics Committee of the Clinical Center of Serbia and cataloged under number 1856/6. Informed consent was obtained from all study subjects.

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Nikolic, A., Despotovic, J., Babic, T. et al. SMAD4 Gene Analysis in Patients with Early Onset Colorectal Cancer: A Pilot Study. Cytol. Genet. 56, 273–276 (2022). https://doi.org/10.3103/S0095452722030082

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  • DOI: https://doi.org/10.3103/S0095452722030082

Keywords:

  • colorectal cancer
  • early onset disease
  • genetic testing
  • pathogenic variant
  • SMAD4