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N6-methyladenosine modification of circNSUN2 facilitates cytoplasmic export and stabilizes HMGA2 to promote colorectal liver metastasis
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N6-methyladenosine modification of circNSUN2 facilitates cytoplasmic export and stabilizes HMGA2 to promote colorectal liver metastasis
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N6-methyladenosine modification of circNSUN2 facilitates cytoplasmic export and stabilizes HMGA2 to promote colorectal liver metastasis
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Journal Article
N6-methyladenosine modification of circNSUN2 facilitates cytoplasmic export and stabilizes HMGA2 to promote colorectal liver metastasis
2019
Overview
Circular RNAs (circRNAs) have been implicated in cancer progression through largely unknown mechanisms. Herein, we identify an
N
6
-methyladenosine (m
6
A) modified circRNA, circNSUN2, frequently upregulated in tumor tissues and serum samples from colorectal carcinoma (CRC) patients with liver metastasis (LM) and predicts poorer patient survival. The upregulated expression of circNSUN2 promotes LM in PDX metastasis models in vivo and accelerates cancer cells invasion in vitro. Importantly,
N
6
-methyladenosine modification of circNSUN2 increases export to the cytoplasm. By forming a circNSUN2/IGF2BP2/
HMGA2
RNA-protein ternary complex in the cytoplasm, circNSUN2 enhances the stability of
HMGA2
mRNA to promote CRC metastasis progression. Clinically, the upregulated expressions of circNSUN2 and
HMGA2
are more prevalent in LM tissues than in primary CRC tissues. These findings elucidate that
N
6
-methyladenosine modification of circNSUN2 modulates cytoplasmic export and stabilizes
HMGA2
to promote CRC LM, and suggest that circNSUN2 could represent a critical prognostic marker and/or therapeutic target for the disease.
Liver metastasis of colorectal cancer leads to poor prognosis. Here the authors report that an
N
6
-methyladenosine modified circular RNA is upregulated in colorectal cancer and promotes liver metastasis by enhancing the stability of
HMGA2
mRNA.
