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pH Scale02:41

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Hydronium and hydroxide ions are present both in pure water and in all aqueous solutions, and their concentrations are inversely proportional as determined by the ion product of water (Kw). The concentrations of these ions in a solution are often critical determinants of the solution’s properties and the chemical behaviors of its other solutes. Two different solutions can differ in their hydronium or hydroxide ion concentrations by a million, billion, or even trillion times. A common means of...
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Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.
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A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.
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Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
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集団スケールのシーケンシングは,持続的なEBV DNAの決定因子を解決します.

Sherry S Nyeo1,2, Erin M Cumming1, Oliver S Burren3

  • 1Computational and Systems Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA.

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まとめ

持続的なエプスタイン・バーウイルス (EBV) のDNAレベルは,様々な病気に関連しています. 遺伝的要因,特に免疫調節と抗原処理における遺伝的要因は,EBVの持続性と疾患のリスクに影響を与える.

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科学分野:

  • 遺伝学 遺伝学とは
  • ウイルス学 ウイルス学 ウイルス学
  • 免疫学 免疫学とは
  • バイオインフォマティックス

背景:

  • エプスタイン・バーウイルス (EBV) は,自己免疫疾患,がん,神経疾患に関連する広範囲に広がるヘルペスウイルスです.
  • 主要EBV感染はしばしば無症状ですが,持続的な感染は免疫機能の調節不全と慢性的な健康問題につながる可能性があります.
  • 初期被曝後にEBVの持続性を決定する遺伝的要因は十分に理解されていません.

研究 の 目的:

  • 持続的なエプスタイン・バーウイルスDNAの遺伝的構造を調査するために.
  • 大規模な人口データを用いて,EBVのDNAレベルに影響を与える宿主の遺伝的要因を特定する.
  • EBVのDNA負荷と様々な非癌性疾患との関連を調査する.

主な方法:

  • UK Biobank (n=490,560) とAll of Us (n=245,394) のコホートからの全ゲノムシーケンシング (WGS) と健康記録データを活用した.
  • WGSデータを用いた血液サンプルにおける定量化された持続性EBVDNA.
  • 遺伝的決定因子を特定するために全ゲノム関連研究 (GWAS) を実施し,遺伝子発現とHLAデータを分析した.

主要な成果:

  • 既存のWGSデータからEBVDNAを定量化するための再現可能な方法を確立しました.
  • EBVのDNAレベルと呼吸器系,自己免疫系,神経系,心血管疾患との間に有意な関連性を特定しました.
  • 免疫調節領域に濃縮されたEBVDNAの持続性の遺伝的遺伝性を発見し,148の候補遺伝子を特定し,変異性抗原処理とHLAクラスIIの変異を伴う.

結論:

  • 集団規模のWGSデータの再分析は,ウイルスDNAの持続性の遺伝的根拠を効果的に明らかにすることができます.
  • ホストの遺伝的変異は,EBVのDNAの持続性を著しく調節し,さまざまな疾患に対する感受性に影響を与えます.
  • この枠組みは,ヒトウイルス群内の他のウイルス感染症の遺伝的基盤を研究するために一般化できます.