Genomic analyses reveal mutational signatures and frequently altered genes in esophageal squamous cell carcinoma.
Am J Hum Genet
; 96(4): 597-611, 2015 Apr 02.
Article
en En
| MEDLINE
| ID: mdl-25839328
ABSTRACT
Esophageal squamous cell carcinoma (ESCC) is one of the most common cancers worldwide and the fourth most lethal cancer in China. However, although genomic studies have identified some mutations associated with ESCC, we know little of the mutational processes responsible. To identify genome-wide mutational signatures, we performed either whole-genome sequencing (WGS) or whole-exome sequencing (WES) on 104 ESCC individuals and combined our data with those of 88 previously reported samples. An APOBEC-mediated mutational signature in 47% of 192 tumors suggests that APOBEC-catalyzed deamination provides a source of DNA damage in ESCC. Moreover, PIK3CA hotspot mutations (c.1624G>A [p.Glu542Lys] and c.1633G>A [p.Glu545Lys]) were enriched in APOBEC-signature tumors, and no smoking-associated signature was observed in ESCC. In the samples analyzed by WGS, we identified focal (<100 kb) amplifications of CBX4 and CBX8. In our combined cohort, we identified frequent inactivating mutations in AJUBA, ZNF750, and PTCH1 and the chromatin-remodeling genes CREBBP and BAP1, in addition to known mutations. Functional analyses suggest roles for several genes (CBX4, CBX8, AJUBA, and ZNF750) in ESCC. Notably, high activity of hedgehog signaling and the PI3K pathway in approximately 60% of 104 ESCC tumors indicates that therapies targeting these pathways might be particularly promising strategies for ESCC. Collectively, our data provide comprehensive insights into the mutational signatures of ESCC and identify markers for early diagnosis and potential therapeutic targets.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Neoplasias Esofágicas
/
Carcinoma de Células Escamosas
/
Transducción de Señal
/
Genoma Humano
/
Fosfatidilinositol 3-Quinasas
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Predisposición Genética a la Enfermedad
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Citidina Desaminasa
/
Mutación
Tipo de estudio:
Prognostic_studies
/
Screening_studies
Límite:
Humans
País/Región como asunto:
Asia
Idioma:
En
Revista:
Am J Hum Genet
Año:
2015
Tipo del documento:
Article
País de afiliación:
China