Abstract
Background
Metabolic reprogramming is an emerging topic in cancer research. However, genetic alterations in genes encoding enzymes involved in amino acid metabolism are largely unknown. The aim of this study was to explore whether genes known to be involved in amino acid metabolism are mutated in gastric cancer (GC) and/or colorectal cancer (CRC).
Methods
Through a public database search, we found that a number of genes known to be involved in amino acid metabolism, i.e., AGXT, ALDH2, APIP, MTR, DNMT1, ASH1L, ASPA, CAD, DDC, GCDH, DLD, LAP3, MCEE and MUT, harbor mononucleotide repeats that may serve as mutation targets in cancers exhibiting microsatellite instability (MSI). We assessed these genes for the presence of the mutations in 79 GCs and 124 CRCs using single-strand conformation polymorphism (SSCP) and direct sequencing analyses.
Results
Using SSCP in conjunction with DNA sequencing we detected frameshift mutations in AGXT (17 cases), ALDH2 (3 cases), APIP (4 cases), MTR (5 cases), DNMT1 (1 case), ASH1L (1 case), ASPA (2 cases), CAD (2 cases), DDC (1 case), GCDH (3 cases), DLD (1 case), LAP3 (1 case), MCEE (5 cases) and MUT (1 case). These mutations were exclusively detected in MSI-high (MSI-H), and not in MSI-low or MSI-stable (MSI-L/MSS) cases. In addition, we analyzed 16 CRCs for the presence of intra-tumor heterogeneity (ITH) and found that two CRCs harbored regional ITH for GCDH frameshift mutations.
Conclusions
Our data indicate that genes known to be involved in amino acid metabolism recurrently acquire somatic mutations in MSH-H GCs and MSH-H CRCs and that, in addition, mutation ITH does occur in at least some of these tumors. Together, these data suggest that metabolic reprogramming may play a role in the etiology of MSI-H GCs and CRCs. Our data also suggest that ultra-regional mutation analysis is required for a more comprehensive evaluation of the mutation status in these tumors.
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Acknowledgments
This work was supported by a grant from National Research Foundation of Korea (2012R1A5A2047939).
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Authors’ Contribution
MRC and SHL wrote the manuscript. MRC performed the experimental work. NJY and SHL performed the pathological examinations. SHL and ACH designed the work.
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Oh, H.R., An, C.H., Yoo, N.J. et al. Somatic mutations of amino acid metabolism-related genes in gastric and colorectal cancers and their regional heterogeneity - a short report. Cell Oncol. 37, 455–461 (2014). https://doi.org/10.1007/s13402-014-0209-1
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DOI: https://doi.org/10.1007/s13402-014-0209-1