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Related Concept Videos

Chromosomal Theory of Inheritance01:39

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In 1866, Gregor Mendel published the results of his pea plant breeding experiments, providing evidence for predictable patterns in the inheritance of physical characteristics. The significance of his findings was not immediately recognized. In fact, the existence of genes was unknown at the time. Mendel referred to hereditary units as “factors.”
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Inheritance of Chromatin Structures03:17

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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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Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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Non-nuclear Inheritance01:29

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Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm⁠—such as chloroplasts and mitochondria⁠—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
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Computational Analysis of the Caenorhabditis elegans Germline to Study the Distribution of Nuclei, Proteins, and the Cytoskeleton
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Centromere inheritance through the germline.

Arunika Das1,2, Evan M Smoak1,2,3, Ricardo Linares-Saldana4

  • 1Department of Biology, University of Pennsylvania, Philadelphia, PA, 19104, USA.

Chromosoma
|August 10, 2017
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Summary

Centromere identity relies on the epigenetic mark of centromere protein A (CENP-A). Maintaining CENP-A is crucial for inheritance, especially during challenging gametogenesis.

Keywords:
CENP-ACentromereGermlineInheritance

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Genetics

Background:

  • Centromeres are essential for chromosome segregation and genetic inheritance.
  • Centromere identity is epigenetically defined by centromere protein A (CENP-A) nucleosomes, independent of DNA sequence.
  • Maintaining CENP-A marks across generations is critical for centromere inheritance.

Purpose of the Study:

  • To review the current understanding of centromere inheritance during animal gametogenesis.
  • To highlight challenges and outstanding questions in germline centromere inheritance.

Main Methods:

  • Review of existing literature on centromere biology and gametogenesis.
  • Analysis of models for CENP-A chromatin assembly in cycling somatic cells.
  • Consideration of unique challenges posed by germline cell cycle arrest and genome reorganization.

Main Results:

  • Centromere inheritance depends on maintaining CENP-A nucleosomes across cell generations.
  • Existing models of CENP-A assembly in somatic cells may not fully apply to gametogenesis.
  • Gametogenesis presents unique hurdles for centromere inheritance due to extended cell cycle arrest and genome-wide reorganization.

Conclusions:

  • Germline centromere inheritance faces significant challenges distinct from somatic cell inheritance.
  • Further research is needed to understand how CENP-A marks are maintained through gametogenesis.
  • Understanding germline centromere inheritance is crucial for ensuring accurate genetic transmission.