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What is Gene Expression?01:42

What is Gene Expression?

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Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...
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What is Gene Expression?01:36

What is Gene Expression?

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A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised  of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then...
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Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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Cell Specific Gene Expression01:58

Cell Specific Gene Expression

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mRNA Stability and Gene Expression02:51

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The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
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遺伝子発現に基づく機械学習とSHAP解析を用いた大腸がん予測

Yulai Yin1, Zhen Yang1, Xueqing Li1,2

  • 1School of Medicine, Nankai University, Tianjin 300071, China.

Genes
|January 28, 2026
PubMed
まとめ

機械学習を用いた大腸がん(CRC)の新規遺伝子診断モデルが開発された。この10遺伝子モデルは高い予測性能を示し、早期CRC検出と介入の可能性を提供する。

キーワード:
大腸がん差次的遺伝子機械学習メンデルランダム化予測モデル

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科学分野:

  • ゲノミクス
  • バイオインフォマティクス
  • 腫瘍学

背景:

  • 大腸がん(CRC)は、世界的な健康問題として大きな課題となっています。
  • 正確かつ早期の診断は、効果的な治療と患者転帰の改善のために不可欠です。
  • 遺伝子マーカーは、精密診断ツールの開発のための有望な道を提供します。

研究 の 目的:

  • 大腸がん(CRC)の堅牢な遺伝子診断モデルを開発および検証すること。
  • 統合バイオインフォマティクス解析を通じてCRC関連の主要遺伝子を特定すること。
  • CRCリスクと診断の予測に機械学習を活用すること。

主な方法:

  • TCGAデータベースを用いた差次的遺伝子発現解析。
  • eQTLおよびCRC転帰データを用いたメンデルランダム化解析。
  • XGBoostを含む9つの機械学習アルゴリズムを用いた診断モデルの開発と検証。
  • 差次的発現、ランダム化解析、および機械学習モデルの重要性に基づいた遺伝子選択。

主要な成果:

  • TCGAデータベースを用いて、3716の差次的発現遺伝子(DEG)とメンデルランダム化により特定された121の大腸がん関連遺伝子を同定しました。
  • 最終的な10遺伝子シグネチャ(RIF1、GDPD5、DBNDD1、RCCD1、CLDN5、ASCL2、IFITM3、IFITM1、SMPDL3A、SUCLG2)を確立しました。
  • XGBoostモデルはAUC 0.990を達成し、最終モデルはAUC 0.9875(トレーニング)および0.9601(検証)を示しました。
  • IFITM1およびDBNDD1が最も影響力のある遺伝子として特定されました。

結論:

  • CRCにおける遺伝子発現プロファイルは、細胞増殖、代謝、および免疫回避の亢進を反映しています。
  • 開発された10遺伝子の遺伝子診断モデルは、CRCに対して強力な予測性能を示します。
  • このモデルは、早期CRC診断、介入、および三次予防戦略において大きな可能性を秘めています。