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Related Experiment Video

Updated: Jul 16, 2026

A Novel Strategy Combining Array-CGH, Whole-exome Sequencing and In Utero Electroporation in Rodents to Identify Causative Genes for Brain Malformations

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Published on: December 1, 2017

Genetic and evolutional mechanisms explain associated malformations--a 'G-E-M' concept.

Sanjay G Gokhale¹, Sankalp Gokhale

¹Department of Pediatrics and Neonatology, Rajhans Hospital and Pathology Laboratory Station Road, Saphale 401102, Maharashtra, India. rajhanssanjay@yahoo.com

Medical Hypotheses

|March 23, 2007

Summary

Evolutionary history reveals that segmented organs like the heart and kidneys predated the vertebral column. Hox genes play a crucial role in conserved embryonic development across species, explaining complex malformations.

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Published on: May 8, 2020

Area of Science:

Evolutionary developmental biology
Comparative genomics
Developmental malformations

Background:

Segmented structures such as the heart and kidneys evolved before the vertebral column.
Segmentation is a fundamental body plan principle in invertebrates (annelids, arthropods) and vertebrates.
The evolution of the vertebral column, heart, and kidneys involved shared genetic control over embryological development.

Purpose of the Study:

To explore the evolutionary timeline of segmented organ development.
To investigate the role of Hox genes in conserved embryonic morphogenesis.
To provide an evolutionary and genetic framework for understanding developmental malformations like VACTERL.

Main Methods:

Comparative analysis of evolutionary timelines for key segmented structures.
Review of genetic mechanisms, particularly homeobox (Hox) genes, in embryogenesis.
Examination of evolutionary conservation of developmental control between vertebrates and invertebrates.

Main Results:

The notochord evolved into a segmented vertebral column, with ribs appearing later.
Segmentation is evident in hearts and kidneys of invertebrates, indicating early evolution.
Hox gene mutations are linked to significant morphological changes and macroevolutionary events, such as insect divergence.
Embryonic morphology control is highly conserved, with Hox genes central to this process.

Conclusions:

The evolution of segmented organs and the vertebral column is intertwined with shared genetic pathways.
Hox genes are critical regulators of embryonic development, conserved across diverse taxa.
Understanding these evolutionary and genetic mechanisms offers insights into the etiology of congenital malformations.