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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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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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Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each...
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Meiosis is the process by which diploid cells divide to produce haploid daughter cells. In humans, each diploid cell contains 46 chromosomes, half from the mother and half from the father. Following meiosis, the resulting haploid eggs or sperm only contain 23 chromosomes; however, each of these chromosomes contains a unique combination of parental information that results from the meiotic process of crossing over.
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Meiosis is the process by which diploid cells divide to produce haploid daughter cells. In humans, each diploid cell contains 46 chromosomes, half from the mother and half from the father. Following meiosis, the resulting haploid eggs or sperm only contain 23 chromosomes; however, each of these chromosomes contains a unique combination of parental information that results from the meiotic process of crossing over.
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Cell-specific endopolyploidy in developing Artemia.

John A Freeman1, Robert B Chronister2

  • 1Department of Biology (JAF), University of South Alabama, 36688, Mobile, AL, USA.

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|March 18, 2017
PubMed
Summary
This summary is machine-generated.

Developing brine shrimp (Artemia franciscana SFB) exhibit tissue-specific DNA content variations. This endopolyploidy, driven by endoreduplication, impacts cell proliferation and differentiation across various tissues.

Keywords:
ArtemiaDifferentiationEndopolyploidy

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Genetics

Background:

  • Cellular DNA content and ploidy are critical for tissue development and function.
  • Understanding cell cycle regulation and differentiation pathways is essential in developmental studies.
  • Artemia franciscana (brine shrimp) serves as a model organism for studying crustacean development.

Purpose of the Study:

  • To investigate tissue-specific differences in DNA content within developing Artemia franciscana.
  • To determine the relationship between DNA content, cell proliferation, and differentiation in various tissues.
  • To elucidate the mechanism driving observed ploidy variations, specifically endopolyploidy.

Main Methods:

  • Utilized fluorescence intensity of bisbenzimide-stained nuclei to quantify DNA content.
  • Measured nuclear area as an indicator of DNA content and ploidy.
  • Analyzed chromosome number to confirm ploidy levels and identify the mechanism of polyploidization.

Main Results:

  • Demonstrated significant tissue-specific variations in DNA content, ranging from diploid (2C) to polyploid (>8C).
  • Identified proliferating diploid cells in the epidermis and neural tissues, while setal and salt gland cells showed higher ploidy and limited division.
  • Confirmed that endopolyploidy in Artemia franciscana is primarily achieved through endoreduplication, not whole genome duplication, with a consistent chromosome number (n=42) across tissues.

Conclusions:

  • Developing Artemia franciscana exhibits complex tissue-specific endopolyploidy, regulated by endoreduplication.
  • Ploidy level is correlated with cell type and proliferative status, influencing tissue morphogenesis and function.
  • This study provides insights into the diverse strategies of cell cycle regulation during development in invertebrates.