46 research outputs found
The role of RNA quality control via nonsense-mediated mRNA decay in longevity of C. elegans
Doctorλ
Ένκ° μ§νλ κ°μ²΄μ κ²½μ° DNAμ λ¨λ°±μ§μ λ³μ΄κ° μκΈ°κ±°λ κ·Έ κΈ°λ₯μ΄ μ νλμ΄ μλ€. κ·Έλ¦¬κ³ DNAμ λ¨λ°±μ§μ μνκ° λλΉ μ§λ κ² λν λ
Ένλ₯Ό μ΄μ§νκ±°λ μ§λ³μ μΌκΈ°νλ€λ κ²μ΄ μ μλ €μ Έ μμλ€. νμ§λ§ RNAμ νμ§μ΄ λ
Ένμ λ°λΌ λ³νλμ§, νΉμ RNA νμ§ μ μ§κ΄λ¦¬κ° λ
Ένμ μν₯μ λΌμΉλμ§λ μ μλ €μ Έ μμ§ μμλ€. μνκ° λλΉ μ§ RNAλ μλͺ» μμ±λ RNAλ nonsense-mediated mRNA decay (NMD) μμ©μ ν΅ν΄ λΆν΄λμ΄ μμ΄μ§μΌλ‘μ¨ RNAμ νμμ±μ΄ μ μ§λλ€. λ³Έ μ°κ΅¬μμλ RNA μ μ§κ΄λ¦¬μ μ€μν NMD μμ©μ΄ μμκΌ¬λ§μ μΆ©μ μ₯μ λͺ¨λΈμΈ DAF-2/μΈμλ¦° μμ©μ²΄ λμ°λ³μ΄μ μλͺ
μ¦κ°μ νμμ μ΄λΌλ κ²μ μλ‘κ² λ°νλ€. DAF-2μ κΈ°λ₯μ΄ μ νλμ λ NMDμ νμ±μ΄ μ¦κ°νμκ³ , μ΄λ₯Ό ν΅ν΄ ν΄λ‘μΈ μ μλ μλͺ»λ RNAκ° λΆν΄λμ΄ μμ΄μ‘λ€. λν, NMD 볡ν©μ²΄λ₯Ό ꡬμ±νλ μ€μν λ¨λ°±μ§μΈ SMG-2/UPF1μ΄ DAF-2/μΈμλ¦° μμ©μ²΄ λμ°λ³μ΄λΏλ§ μλλΌ λ€λ₯Έ μ₯μ λͺ¨λΈ κΌ¬λ§μ μΆ©μ μλͺ
μ°μ₯μ νμνλ€λ κ²μ μμλμΌλ‘μ¨ SMG/UPF1μ ν΅ν NMDκ° λ€μν λ°©λ²μ ν΅ν μλͺ
μ°μ₯μ μ€μν μν μ ν μ μλ€λ κ²μ μμλλ€. λλΆμ΄, νΉν μ κ²½μΈν¬μ NMDκ° μλͺ
μ μ€μν κ²μΌλ‘ λνλ¬κ³ , NMD νκΉμΈ YARS-2/tyrosyl tRNA synthetase RNAμ μμ΄ μ€μ΄λλ κ²μ΄ DAF-2/μΈμλ¦° μμ©μ²΄ λμ°λ³μ΄μ μ₯μμ νμμ μ΄λΌλ κ²μ 보μλ€. μ΄ μ°κ΅¬λ NMDλ₯Ό ν΅ν RNA νμμ±μ‘°μ μ΄ DAF-2/μΈμλ¦° μμ©μ²΄ λμ°λ³μ΄μ μ₯μμ μ€μνλ€λ κ²μ μ²μμΌλ‘ λ°νμΌλ©°, κ³ λ±λλ¬Όλ NMD μμ©μ κ°μ§κ³ μλ€λ μ¬μ€λ‘ λ³Ό λ, NMDλ₯Ό ν΅ν RNAμ μ§μ μ μ§κ΄λ¦¬κ° μΈκ°μ μ₯μμλ μ€μν μν μ ν μ μλ€λ κ°λ₯μ±μ μ μνμλ€.The requirement for protein and DNA homeostasis in longevity is well known. However, the role of RNA quality control in aging remains unexplored. Here, we show that nonsense-mediated mRNA decay (NMD), which degrades abnormal transcripts as well as some normal transcripts, promotes longevity by enhancing RNA surveillance in C. elegans. We found that long-lived daf-2/insulin/insulin-like growth factor 1 (IGF-1) receptor mutants displayed enhanced NMD activity and reduced levels of potentially aberrant transcripts. NMD components, including smg-2/UPF1, were required for the long lifespan of daf-2 mutants. In addition, smg-2/UPF1 was required for dietary restriction (eat-2), germline loss (glp-1), and mitochondrial mutant (isp-1) longevity, suggesting that NMD is generally important for maintenance of biological function with age. NMD in the nervous system of the animals was particularly important for RNA homeostasis to promote longevity. We propose that up-regulation of NMD activity contributes to long lifespan caused by reduced insulin/IGF-1 signaling, and that NMD-mediated RNA surveillance is a crucial homeostatic process that contributes to organismal longevity