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Neurulation01:30

Neurulation

Neurulation is the embryological process which forms the precursors of the central nervous system and occurs after gastrulation has established the three primary cell layers of the embryo: ectoderm, mesoderm, and endoderm. In humans, the majority of this system is formed via primary neurulation, in which the central portion of the ectoderm—originally appearing as a flat sheet of cells—folds upwards and inwards, sealing off to form a hollow neural tube. As development proceeds, the anterior...
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Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata will form...
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The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
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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 sister...
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A case of lower mesodermal defects sequence.

T Tos1, S Aktas, M Ikbal

  • 1Department of Genetics, Dr. Sami Ulus Maternity and Children's Hospital, Ankara, Turkey. tulaytos@hotmail.com

Genetic Counseling (Geneva, Switzerland)
|February 5, 2011
PubMed
Summary

A stillborn fetus presented with a rare lower mesodermal defects sequence. This condition was linked to severe congenital anomalies including craniorachischisis and anencephaly.

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Area of Science:

  • Developmental biology
  • Teratology
  • Medical genetics

Background:

  • Mesodermal defects are a group of congenital anomalies resulting from abnormal development of the mesoderm.
  • These defects can affect various organ systems and range in severity.
  • Understanding the genetic and environmental factors influencing mesodermal development is crucial.

Observation:

  • A stillborn fetus was identified with a significant lower mesodermal defects sequence.
  • The fetus exhibited concurrent severe congenital malformations.
  • These included craniorachischisis, anencephaly, and bilateral pulmonary hypoplasia.

Findings:

  • The case highlights a rare association between lower mesodermal defects sequence and a constellation of severe neural tube defects and organ development issues.
  • Craniorachischisis and anencephaly represent severe disruptions in central nervous system development.
  • Bilateral pulmonary hypoplasia indicates compromised lung development, often incompatible with life.

Implications:

  • This case expands the known spectrum of mesodermal defects sequence and its potential phenotypic manifestations.
  • It underscores the complex interplay between mesodermal development and the formation of the central nervous system and other organs.
  • Further research into the etiology of such complex congenital anomalies is warranted to improve diagnostic and potentially therapeutic strategies.