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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...
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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
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Persistent Notochord in a Fetus with COL2A1 Mutation.

Elisabeth Codsi1, Brian C Brost2, Arij Faksh1

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Summary

A COL2A1 gene mutation was linked to a persistent notochord, a rare fetal anomaly, identified via ultrasound. This case report details the ultrasound and postmortem findings, contributing to understanding skeletal dysplasias.

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Area of Science:

  • Genetics and Developmental Biology
  • Medical Imaging and Diagnostics
  • Skeletal Dysplasias

Background:

  • COL2A1 mutations are associated with various skeletal dysplasias.
  • A persistent notochord is a rare congenital anomaly.
  • Prenatal diagnosis of skeletal anomalies relies heavily on ultrasound.

Purpose of the Study:

  • To report the first human case of a persistent notochord associated with a COL2A1 mutation.
  • To describe the prenatal ultrasound findings in this unique case.
  • To review the potential pathogenesis of a persistent notochord in the context of COL2A1 mutations.

Main Methods:

  • Second-trimester fetal ultrasound examination.
  • Postmortem examination of the fetus.
  • Review of existing literature on COL2A1 mutations and persistent notochord.

Main Results:

  • Ultrasound revealed multiple anomalies: micromelia, poor vertebral mineralization, and a persistent notochord.
  • Genetic testing confirmed a mutation in the COL2A1 gene.
  • Postmortem findings corroborated the ultrasound observations.

Conclusions:

  • This case establishes a novel association between COL2A1 mutations and persistent notochord in humans.
  • Prenatal ultrasound is crucial for identifying complex fetal anomalies.
  • Further research is needed to elucidate the specific pathogenic mechanisms linking COL2A1 to notochordal persistence.