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               ·1232 ·                           南 京    医 科 大 学 学         报                        2025年9月


              A          HCC827                HCC827/OR        B                       C    40
                                                                   (μmol/L)  8 7 6           30          ***

                ×100                                                  5 4 3                 Relative expression of cirrc⁃3633  20
                                                                   IC50 of osimertinib  0.09  10   **


                                                                    0.06
                          H1975                 H1975/OR            0.03 0                    0
                                                                       HCC827  H1975           H1975  HCC827
                                                                                                 H1975/OR
                                                                                                       HCC827/OR
                                                                                H1975/OR
                                                                        HCC827/OR
                ×100


                 A:Morphology of drug⁃resistant cells and sensitive cells. B:IC50 of drug⁃resistant cells was elevated compared with that of sensitive cells. C:qRT⁃
                                                                            **
              PCR verification that circ_0003633 was significantly highly expressed in drug⁃resistant cell lines. P < 0.01 and  *** P < 0.001(n=3).
                                               图1 circ_0003633在耐药细胞中高表达
                                     Figure 1 circ_0003633 is highly expressed in drug⁃resistant cells

              证 circ_0003633 环形结构的发散和收敛引物,仅在                    证实了circ_0003633含有circRNA结构,比线性亲本
              cDNA中成功扩增,而发散引物在gDNA无法检测到                         基因 RYK 具有更强的抵抗 RNase R 外切酶的作用
              相应的条带,证实了 circ_0003633 的环状结构(图                   (图2C)。此外,通过核质分离实验(图2D)和FISH实
              2B)。同时,使用RNase R外切酶消化细胞的RNA也                      验(图2E)检测了circ_0003633的亚细胞定位。结果


              A
                 Species  Gene  Isoform    Location    Strand  FPM  Exon Start⁃ExonEnd  Seq Type  Cell Line  Conservation
                                                                                    _
                 Human  RYK  ENST00000460933  Chr3:133894452-  -  0.095  7-13     Ribo   Liver_N22   N.A.
                (hg19)                     133914026
                      position
                organism  (genome  strand  circRNA ID  genomic  spliced  samples  scores  repeats  annotation  best  gene  circRNA
                                                                                            transcript
                                          length
                                                length
                                                                                                   symbol
                                                                                                        study
                      browser link)
                hsa   chr3:133894452⁃ -  hsa_circ_0003633  19 574  796  Hs68_control,Hs68_RNase,WAS2,  11,164,3,0,  None  ANNOTATED, NM_001005861 RYK  Jeck2013,
                      133914026                      cerebellum,diencephalon,  38,65,74,25,  CDS,coding,  Maass2017,
                                                     frontal_cortex,occipital_lobe,  25,5,11,7,15,  INTERNAL,  Rybak2015,
                                                     parietal_lobe,temporal_lobe,549,  23,14,26,NA,  OVCODE,  Salzman2013
                                                     Ag04450,Bj,Gm12878,H1hesc,Helas3, 3,5,4,8  OVEXON
                                                     Hepg2,Huvec,K562,Nhek,Nhlf,Sknshra
                   B       Marker  cDNA  cDNAgDNA      D          HCC827/OR                H1975/OR
                      200 bp                               1.5  Nucleus             1.5  Nucleus
                                                           Relative RNA level  0.9  Relative RNA level  0.9
                      100 bp                               1.2  Cytoplasm           1.2  Cytoplasm
                   C        Mock                           0.6                      0.6
                        1.5  RNase R+   HCC827/OR          0.3                      0.3
                             H1975/OR
                       Relative RNA level  1.0  **  **  E    GAPDH circ_0003633  circ_0003633  circ_0003633
                                                           0.0
                                                                                    0.0
                                                                                      GAPDH
                                                                                            U6
                                                                   U6
                                                                      liner⁃RYK
                                                                                               liner⁃RYK
                        0.5
                                                                                                Merge
                                                                 DAPI
                         0
                                  circ_0003633
                       circ_0003633 liner⁃RYK  liner⁃RYK   H1975/OR
                 A:Basic information of circ_0003633. B,C:Gel electrophoresis and RNase R verification of the circular structure of circ_000363. D,E:Nuclear⁃
                                                                      **
              cytoplasmic separation experiment and FISH detection of circ_0003633 cell localization. P < 0.01(n=3).
                                           图2   验证circ_0003633的环状结构及亚细胞定位
                                Figure 2 Verify the ring structure and subcellular localization of circ_0003633
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