中国组织工程研究 ›› 2025, Vol. 29 ›› Issue (5): 1013-1020.doi: 10.12307/2025.291

• 肌肉肌腱韧带组织构建 tissue construction of the muscle, tendon and ligament • 上一篇    下一篇

甲基化测序和转录组整合分析黄韧带肥厚的分子机制

何  杨1,唐步源1,卢昌怀2   

  1. 1湖南中医药大学,湖南省长沙市  410208;2常德市第一中医医院骨伤科脊柱二病区,湖南省常德市  415000


  • 收稿日期:2024-01-12 接受日期:2024-03-13 出版日期:2025-02-18 发布日期:2024-06-04
  • 通讯作者: 卢昌怀,博士,主任医师,常德市第一中医医院骨伤科脊柱二病区,湖南省常德市 415000
  • 作者简介:何杨,男,1998年生,湖南省常德市人,汉族,湖南中医药大学在读硕士,医师,主要从事脊柱退变与微创研究。
  • 基金资助:
    湖南省自然科学基金面上项目(2021JJ30049),项目负责人:卢昌怀;湖南省研究生科研创新项目(2022CX201),项目负责人:何杨

Molecular mechanisms of ligament flavum hypertrophy: analysis based on methylation sequencing and transcriptome integration 

He Yang1, Tang Buyuan1, Lu Changhuai2   

  1. 1Hunan University of Chinese Medicine, Changsha 410208, Hunan Province, China; 2No. 2 Spinal Ward, Department of Orthopedics and Traumatology, the First Hospital of Traditional Chinese Medicine in Changde, Changde 415000, Hunan Province, China
  • Received:2024-01-12 Accepted:2024-03-13 Online:2025-02-18 Published:2024-06-04
  • Contact: Lu Changhuai, MD, Chief physician, No. 2 Spinal Ward, Department of Orthopedics and Traumatology, the First Hospital of Traditional Chinese Medicine in Changde, Changde 415000, Hunan Province, China
  • About author:He Yang, Master candidate, Physician, Hunan University of Chinese Medicine, Changsha 410208, Hunan Province, China
  • Supported by:
    Natural Science Foundation of Hunan Province (General Program), No. 2021JJ30049 (to LCH); Postgraduate Research Innovation Project of Hunan Province, No. 2022CX201 (to HY)

摘要:




文题释义:
DNA甲基化:是广泛存在于真核生物体内的生物学过程和表观遗传修饰,是储存表观遗传信息的最主要形式,也被认为是表观遗传的核心,与许多生物学现象如衰老、疾病、肿瘤发生和死亡等有密切联系,通过检测正常和肥厚黄韧带组织中甲基化水平差异的位点,可以初步判断调控黄韧带肥厚的潜在基因。
黄韧带肥厚:是在人体衰老过程中黄韧带出现的一种退行性改变,主要表现为黄韧带弹性纤维降解、胶原纤维大量增生、纤维结构改变,最终发生纤维化和瘢痕形成,受老化、机械应力和活动水平等多项因素的影响,是引起腰椎管狭窄的决定性因素之一。

背景:黄韧带肥厚是腰椎管狭窄症的最主要病因,是多个病理因素共同作用的结果,目前黄韧带肥厚的分子机制、作用通路尚不明确,缺乏有效的非手术治疗方案。
目的:使用甲基化测序和转录组整合分析方法,研究黄韧带肥厚发生发展的分子机制。
方法:收集5个正常黄韧带组织和5个肥厚黄韧带组织,采用甲基化测序记录异常甲基化位点和甲基化状态,采用转录组整合分析记录异常表达的基因,取二者交集中甲基化水平与表达水平负相关的基因。采用GO和KEGG富集分析研究差异基因表达的主要功能通路和分子功能。使用PPI互作分析筛选调控黄韧带肥厚的关键基因。
结果与结论:对两组黄韧带行甲基化测序发现高甲基化位点37 173个,低甲基化位点10 583个,转录组整合分析发现异常表达基因720个,其中463个上调基因、257个下调基因。两者重叠基因383个,其中192个基因甲基化水平与表达水平负相关。GO功能通路分析结果显示分子功能富集到10个条目,细胞组分富集到15个条目,生物学途径富集到30个条目。KEGG通路富集分析结果显示,192个基因主要富集到PI3K-Akt信号通路、Rap1信号通路、Focal adhesion信号通路、信号通路等9条通路。PPI互作分析筛选出PPARG、EGFR、CNR1、TNF和COL11A2 5个基因可能是调控黄韧带肥厚的关键基因,主要通过调控组织纤维化、细胞增殖分化、炎症因子水平、胶原纤维表达水平等途径影响黄韧带肥厚的发生发展。


关键词: 黄韧带肥厚, 甲基化测序, 转录组整合分析, 腰椎管狭窄症, DNA甲基化

Abstract: BACKGROUND: Ligament flavum hypertrophy is the main cause of lumbar spinal stenosis, which is the result of multiple pathological factors working together. Currently, the molecular mechanism and pathway of action of ligament flavum hypertrophy are unclear, and there is a lack of effective non-surgical treatment options. 
OBJECTIVE: To investigate the molecular mechanisms of ligament flavum hypertrophy using methylation sequencing and transcriptome integration analysis methods. 
METHODS: Five normal ligament flavum tissue samples and five hypertrophic ligament flavum tissue samples were collected. Abnormal methylation sites and methylation status were recorded by methylation sequencing and abnormally expressed genes were recorded by transcriptome integration analysis. 
The genes that showed a negative correlation between methylation level and expression level at the intersection of the two were selected. GO and KEGG enrichment analyses were used to study the major functional pathways and molecular functions of differentially expressed genes. Key genes regulating ligamentum flavum hypertrophy were screened using protein-protein interaction analysis.
RESULTS AND CONCLUSION: Methylation sequencing of the two groups of the ligament flavum showed 37 173 hypermethylation sites and 10 583 low methylation sites. Transcriptome integration analysis found 720 abnormally expressed genes, of which 463 were upregulated and 257 were down-regulated. There were 383 overlapping genes, of which 192 genes showed a negative correlation between the methylation level and the expression level. GO functional pathway analysis results showed that molecular function was enriched to 10 terms, cellular component was enriched to 15 terms, and biological process (BP) was enriched to 30 terms. The results of KEGG pathway enrichment analysis showed that 192 genes were mainly enriched to 9 pathways, such as PI3K-Akt signaling pathway, Rap1 signaling pathway, and focal adhesion signaling pathway. The protein-protein interaction analysis identified five genes, PPARG, EGFR, CNR1, TNF and COL11A2, which may be the key genes that regulate ligamentum flavum hypertrophy, and they can influence the occurrence and development of ligamentum flavum hypertrophy mainly through the regulation of tissue fibrosis, cell proliferation and differentiation, inflammatory factor levels, and collagen fiber expression.

Key words: Iigamentum flavum hypertrophy, methylation sequencing, transcriptome integration analysis, lumbar spinal stenosis, DNA methylation

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