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Related Concept Videos

Karyotyping01:17

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Overview
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Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers.  Nondisjunction is common during anaphase I or anaphase II of meiosis.  Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold...
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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Related Experiment Video

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Chromosome Preparation From Cultured Cells
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Chromosome evolution screens recapitulate tissue-specific tumor aneuploidy patterns.

Emma V Watson1,2, Jake June-Koo Lee3, Doga C Gulhan3,4

  • 1Department of Genetics, Harvard Medical School and Department of Medicine, Division of Genetics, Brigham and Women's Hospital, Boston, MA, USA.

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|February 22, 2024
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Summary

Copy number alterations in cancer are common but poorly understood. This study reveals how cells select for fittest karyotypes, uncovering mechanisms like Notch signaling in breast cancer development.

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Area of Science:

  • Genetics
  • Cancer Biology
  • Genomics

Background:

  • Whole chromosome and arm-level copy number alterations (CNAs) are frequent in tumors.
  • The selective advantages of these CNAs are not well understood.

Purpose of the Study:

  • To investigate the selective advantages of CNAs in cancer evolution.
  • To model tissue-specific aneuploidy patterns and identify underlying mechanisms.

Main Methods:

  • Unbiased whole chromosome genetic screens and in vitro evolution of aneuploidized human renal and mammary epithelial cells.
  • Hi-C-based translocation mapping to analyze karyotype evolution.
  • Isogenic clonal lineage analysis to elucidate CNA mechanisms.

Main Results:

  • Iterative selection identified fittest karyotypes, modeling tissue-specific tumor aneuploidy patterns without driver mutations.
  • Arm-level events often arise in pairs via centromeric translocations, more frequently in tetraploids.
  • Notch signaling potentiation identified as a driver of 1q gain in breast cancer.

Conclusions:

  • Intrinsic, tissue-specific proliferative effects likely drive tumor copy number patterns in cancer.
  • Aneuploidy and specific CNAs can confer selective advantages during tumor evolution.