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Cell Lines

Cell Lines

A cell line is a population of cells grown in vitro that can be subcultured over several generations. Normal cells cease to divide after a certain number of cell divisions, a process known as replicative senescence. This number, called the Hayflick limit, was conceptualized by Leonard Hayflick in 1961 when he observed that fetal cells grown in culture could only divide 40-60 times. This limit is due to the shortening of the telomeres during each round of cell division, preventing cell division...

Overview Of Cell Separation And Isolation

Overview Of Cell Separation And Isolation

Cell separation was first achieved in 1964 by S. H. Seal, who separated large tumor cells from the smaller blood cells using filtration. Two years later, Pohl and Hawk performed experiments on how cells respond differently to a nonuniform electric field based on the cell type. Such observations were the inception of cell separation methods, which allow isolating a single cell type from a heterogeneous sample.

Genome Annotation and Assembly

Genome Annotation and Assembly

The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.

Heterochromatin

Heterochromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...

Euchromatin

Euchromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...

Flow Cytometry

Flow Cytometry

The development of flow cytometry techniques began in 1934 with initial attempts by Andrew Moldavan, a bacteriologist who counted the cells in a flowing capillary system. Moldavan pumped cells through a capillary tube focused under a microscope for visualization. The invention of photometry allowed the measurement of differentially-stained cells, and Louis Kamentsky developed the first multiparameter flow cytometer in 1965 to identify and count the cancer cells in cervical tissue specimens.
In...

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Updated: Jun 5, 2025

Single-cell RNA-Seq of Defined Subsets of Retinal Ganglion Cells

Single-cell RNA-Seq of Defined Subsets of Retinal Ganglion Cells

Published on: May 22, 2017

AnnoGCD:一个通用的类别发现框架,用于自动注释单元类型.

Francesco Ceccarelli¹, Pietro Liò¹, Sean B Holden¹

¹Department of Computer Science and Technology, University of Cambridge, 15 JJ Thomson Ave, CB3 0FD, Cambridge, UK.

NAR genomics and bioinformatics

|December 11, 2024

概括

此摘要是机器生成的。

在单细胞RNA测序 (scRNA-seq) 数据中,AnnoGCD自动注释细胞类型. 这种新的框架发现了已知的和新的细胞类型,即使在不平衡的数据集中,也促进了生物研究.

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Droplet Barcoding-Based Single Cell Transcriptomics of Adult Mammalian Tissues

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Published on: January 10, 2019

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Last Updated: Jun 5, 2025

Single-cell RNA-Seq of Defined Subsets of Retinal Ganglion Cells

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Published on: May 22, 2017

Discrimination and Characterization of Heterocellular Populations Using Quantitative Imaging Techniques

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Published on: June 30, 2017

Droplet Barcoding-Based Single Cell Transcriptomics of Adult Mammalian Tissues

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Published on: January 10, 2019

科学领域:

基因组学就是基因组学.
计算生物学计算生物学
生物信息学是一种生物信息学.

背景情况:

准确的细胞类型识别对于理解使用单细胞RNA测序 (scRNA-seq) 的生物系统至关重要.
传统的方法需要大量的标记数据集,这往往是不切实际的,因为成本和不完整的信息.
在scRNA-seq数据分析中,发现新型细胞类型仍然是一个重大挑战.

研究的目的:

开发一种用于scRNA-seq数据中自动注释细胞类型的新型计算框架.
通过结合标记和未标记数据来解决传统方法的局限性.
为了使已知和新型细胞类型的发现,包括不平衡的数据集.

主要方法:

提出AnnoGCD,这是一个半监督的框架,结合了通用类别发现 (GCD) 和异常检测 (AD).
实施了两块方法:用于已知的细胞类型分类的半监督区块和用于新型细胞类型识别和聚类的无监督区块.
评估了五个人类scRNA-seq数据集和一只老鼠地图.

主要成果:

与现有方法相比,AnnoGCD在识别已知和新型细胞类型方面表现出卓越的性能.
该框架在处理具有显著类不平衡的数据集方面表现出强度.
取得了已知的细胞类型的准确分类,并有效地发现了新的细胞类型.

结论:

在scRNA-seq数据中,AnnoGCD提供了一种强大且可扩展的解决方案,用于在scRNA-seq数据中自动注释细胞类型.
该方法通过使复杂细胞群的更全面的分析,促进了生物研究的进步.
为生物研究和临床应用提供了有价值的工具,代码可在GitHub上找到.