Mutational and expressional analysis of RFC3, a clamp loader in DNA replication, in gastric and colorectal cancers

• Published in: Human pathology 2010-10, Vol.41 (10), p.1431-1437
• Main Authors: Kim, Yoo Ri, MS, Song, Sang Yong, MD, Kim, Sung Soo, MD, An, Chang Hyeok, MD, Lee, Sug Hyung, MD, Yoo, Nam Jin, MD
• Format: Article
• Language: English
• Subjects: Amino acids; Biological and medical sciences; Cancer; Colorectal cancer; Colorectal Neoplasms - genetics; Colorectal Neoplasms - metabolism; Deoxyribonucleic acid; DNA; DNA Replication; Exons; Expression; Frameshift Mutation; Gastric cancer; Gastroenterology. Liver. Pancreas. Abdomen; Genes; Humans; Investigative techniques, diagnostic techniques (general aspects); Loss of Heterozygosity; Medical sciences; Microsatellite Instability; MSI; Mutation; Pathology; Pathology. Cytology. Biochemistry. Spectrometry. Miscellaneous investigative techniques; Proteins; Repetitive Sequences, Nucleic Acid; Replication Protein C - biosynthesis; Replication Protein C - genetics; RFC3; Stomach Neoplasms - genetics; Stomach Neoplasms - metabolism; Stomach. Duodenum. Small intestine. Colon. Rectum. Anus; Tumors
• ISSN: 0046-8177; 1532-8392
• DOI: 10.1016/j.humpath.2010.03.006

Summary Parts of gastric (GC) and colorectal cancers (CRC) exhibit microsatellite instability (MSI) that causes frameshift mutations and contributes to cancer development. DNA replication and repair play crucial roles in maintenance of genome stability, and their alterations contribute to cancer development. In this study, we analyzed mutation of RFC1 and RFC3, clamp loaders in DNA replication, in GC and CRC with MSI. We analyzed mononucleotide repeats in RFC1 and RFC3 in 29 GC with high MSI (MSI-H), 20 GC with low MSI (MSI-L), 45 GC with stable MSI (MSS), 35 CRC with MSI-H, 20 CRC with MSI-L, and 45 CRC with MSS by single-strand conformation polymorphism. We also analyzed RFC3 expression in the GC and CRC. We found RFC3 frameshift mutations in 7 GC (24.1%) and 9 CRC with MSI-H (25.7%) but not in cancers with MSI-L or MSS. The mutations consisted of 14 c.244delA, one 243_244delAA, and one c.244dupA, which would result in premature stops of RFC3 amino acid synthesis. Loss of RFC3 expression was observed in 51% of the GC and 65% of the CRC, but all of the cancers with RFC3 frameshift mutations were weak or negative. Our data indicate RFC3 mutation and loss of RFC3 expression occur in large fractions of GC and CRC and suggest that these alterations may contribute to the cancer pathogenesis by deregulating DNA repair and replication.