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Genomic Imprinting and Inheritance02:30

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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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After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.
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During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
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Zygotic Fluorescence Recovery After Photo-bleaching Analysis for Chromatin Looseness That Allows Full-term Development
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Epigenetic dynamics during preimplantation development.

Chelsea Marcho1, Wei Cui1, Jesse Mager2

  • 1Department of Veterinary and Animal ScienceUniversity of Massachusetts Amherst, 661 North Pleasant Street, Amherst, Massachusetts 01003, USA.

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|June 3, 2015
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Summary
This summary is machine-generated.

Early mammalian development involves crucial epigenetic reprogramming after fertilization. DNA methylation and histone modifications establish essential programs for cell differentiation and lineage decisions.

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Area of Science:

  • Developmental Biology
  • Epigenetics
  • Genomics

Background:

  • Mammalian development requires cell differentiation from a single zygote with identical genetic material.
  • Epigenetic reprogramming, including erasure of marks, is vital for establishing totipotency post-fertilization.

Purpose of the Study:

  • To review the dynamics of DNA methylation and histone modifications during mammalian preimplantation development.
  • To highlight insights from next-generation sequencing and discoveries in active DNA demethylation.

Main Methods:

  • Review of current literature on epigenetic dynamics in preimplantation embryos.
  • Comparative analysis of human embryos with other model organisms using next-generation sequencing.

Main Results:

  • Epigenetic programs are established shortly after zygote formation, guiding early lineage decisions.
  • Active DNA demethylation mechanisms play a significant role in preimplantation development.

Conclusions:

  • Understanding DNA methylation and histone modification dynamics is key to comprehending early mammalian development.
  • Next-generation sequencing technologies have advanced our knowledge of these crucial epigenetic processes.