Recurrent gain-of-function mutations of RHOA in diffuse-type gastric carcinoma

Shumpei Ishikawa and colleagues report the identification of recurrent gain-of-function mutations in RHOA in diffuse-type gastric carcinomas. Diffuse-type gastric carcinoma (DGC) is characterized by a highly malignant phenotype with prominent infiltration and stromal induction. We performed whole-ex...

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Veröffentlicht in:Nature genetics 2014-06, Vol.46 (6), p.583-587
Hauptverfasser: Kakiuchi, Miwako, Nishizawa, Takashi, Ueda, Hiroki, Gotoh, Kengo, Tanaka, Atsushi, Hayashi, Akimasa, Yamamoto, Shogo, Tatsuno, Kenji, Katoh, Hiroto, Watanabe, Yoshiaki, Ichimura, Takashi, Ushiku, Tetsuo, Funahashi, Shinichi, Tateishi, Keisuke, Wada, Ikuo, Shimizu, Nobuyuki, Nomura, Sachiyo, Koike, Kazuhiko, Seto, Yasuyuki, Fukayama, Masashi, Aburatani, Hiroyuki, Ishikawa, Shumpei
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container_issue 6
container_start_page 583
container_title Nature genetics
container_volume 46
creator Kakiuchi, Miwako
Nishizawa, Takashi
Ueda, Hiroki
Gotoh, Kengo
Tanaka, Atsushi
Hayashi, Akimasa
Yamamoto, Shogo
Tatsuno, Kenji
Katoh, Hiroto
Watanabe, Yoshiaki
Ichimura, Takashi
Ushiku, Tetsuo
Funahashi, Shinichi
Tateishi, Keisuke
Wada, Ikuo
Shimizu, Nobuyuki
Nomura, Sachiyo
Koike, Kazuhiko
Seto, Yasuyuki
Fukayama, Masashi
Aburatani, Hiroyuki
Ishikawa, Shumpei
description Shumpei Ishikawa and colleagues report the identification of recurrent gain-of-function mutations in RHOA in diffuse-type gastric carcinomas. Diffuse-type gastric carcinoma (DGC) is characterized by a highly malignant phenotype with prominent infiltration and stromal induction. We performed whole-exome sequencing on 30 DGC cases and found recurrent RHOA nonsynonymous mutations. With validation sequencing of an additional 57 cases, RHOA mutation was observed in 25.3% (22/87) of DGCs, with mutational hotspots affecting the Tyr42, Arg5 and Gly17 residues in RHOA protein. These positions are highly conserved among RHO family members, and Tyr42 and Arg5 are located outside the guanine nucleotide–binding pocket. Several lines of functional evidence indicated that mutant RHOA works in a gain-of-function manner. Comparison of mutational profiles for the major gastric cancer subtypes showed that RHOA mutations occur specifically in DGCs, the majority of which were histopathologically characterized by the presence of poorly differentiated adenocarcinomas together with more differentiated components in the gastric mucosa. Our findings identify a potential therapeutic target for this poor-prognosis subtype of gastric cancer with no available molecularly targeted drugs.
doi_str_mv 10.1038/ng.2984
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Diffuse-type gastric carcinoma (DGC) is characterized by a highly malignant phenotype with prominent infiltration and stromal induction. We performed whole-exome sequencing on 30 DGC cases and found recurrent RHOA nonsynonymous mutations. With validation sequencing of an additional 57 cases, RHOA mutation was observed in 25.3% (22/87) of DGCs, with mutational hotspots affecting the Tyr42, Arg5 and Gly17 residues in RHOA protein. These positions are highly conserved among RHO family members, and Tyr42 and Arg5 are located outside the guanine nucleotide–binding pocket. Several lines of functional evidence indicated that mutant RHOA works in a gain-of-function manner. Comparison of mutational profiles for the major gastric cancer subtypes showed that RHOA mutations occur specifically in DGCs, the majority of which were histopathologically characterized by the presence of poorly differentiated adenocarcinomas together with more differentiated components in the gastric mucosa. 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Academic</collection><jtitle>Nature genetics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kakiuchi, Miwako</au><au>Nishizawa, Takashi</au><au>Ueda, Hiroki</au><au>Gotoh, Kengo</au><au>Tanaka, Atsushi</au><au>Hayashi, Akimasa</au><au>Yamamoto, Shogo</au><au>Tatsuno, Kenji</au><au>Katoh, Hiroto</au><au>Watanabe, Yoshiaki</au><au>Ichimura, Takashi</au><au>Ushiku, Tetsuo</au><au>Funahashi, Shinichi</au><au>Tateishi, Keisuke</au><au>Wada, Ikuo</au><au>Shimizu, Nobuyuki</au><au>Nomura, Sachiyo</au><au>Koike, Kazuhiko</au><au>Seto, Yasuyuki</au><au>Fukayama, Masashi</au><au>Aburatani, Hiroyuki</au><au>Ishikawa, Shumpei</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Recurrent gain-of-function mutations of RHOA in diffuse-type gastric carcinoma</atitle><jtitle>Nature genetics</jtitle><stitle>Nat Genet</stitle><addtitle>Nat Genet</addtitle><date>2014-06-01</date><risdate>2014</risdate><volume>46</volume><issue>6</issue><spage>583</spage><epage>587</epage><pages>583-587</pages><issn>1061-4036</issn><eissn>1546-1718</eissn><abstract>Shumpei Ishikawa and colleagues report the identification of recurrent gain-of-function mutations in RHOA in diffuse-type gastric carcinomas. Diffuse-type gastric carcinoma (DGC) is characterized by a highly malignant phenotype with prominent infiltration and stromal induction. We performed whole-exome sequencing on 30 DGC cases and found recurrent RHOA nonsynonymous mutations. With validation sequencing of an additional 57 cases, RHOA mutation was observed in 25.3% (22/87) of DGCs, with mutational hotspots affecting the Tyr42, Arg5 and Gly17 residues in RHOA protein. These positions are highly conserved among RHO family members, and Tyr42 and Arg5 are located outside the guanine nucleotide–binding pocket. Several lines of functional evidence indicated that mutant RHOA works in a gain-of-function manner. Comparison of mutational profiles for the major gastric cancer subtypes showed that RHOA mutations occur specifically in DGCs, the majority of which were histopathologically characterized by the presence of poorly differentiated adenocarcinomas together with more differentiated components in the gastric mucosa. Our findings identify a potential therapeutic target for this poor-prognosis subtype of gastric cancer with no available molecularly targeted drugs.</abstract><cop>New York</cop><pub>Nature Publishing Group US</pub><pmid>24816255</pmid><doi>10.1038/ng.2984</doi><tpages>5</tpages></addata></record>
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language eng
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source MEDLINE; Nature Journals Online; SpringerLink Journals - AutoHoldings
subjects 13/89
38/77
45
45/23
692/699/1503/1504/1829
692/699/67/395
Adenocarcinoma - genetics
Agriculture
Amino Acid Sequence
Animal Genetics and Genomics
Biomedicine
Cancer
Cancer Research
Carcinoma - genetics
Care and treatment
Cell Differentiation
DNA Mutational Analysis
Gastric cancer
Gastric Mucosa - pathology
Gene Function
Gene Library
Gene mutations
Genes
Genetic aspects
Genetic research
Germ-Line Mutation
Grants
High-Throughput Nucleotide Sequencing
Human Genetics
Humans
Identification and classification
letter
Models, Molecular
Molecular Sequence Data
Mutation
Oncology, Experimental
Phenotype
Prognosis
Proteins
rhoA GTP-Binding Protein - genetics
RNA, Small Interfering - metabolism
Science
Sequence Homology, Amino Acid
Stomach cancer
Stomach Neoplasms - genetics
Stromal Cells - metabolism
Studies
Tumors
title Recurrent gain-of-function mutations of RHOA in diffuse-type gastric carcinoma
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