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Related Experiment Video

Updated: Jun 10, 2026

Lineage Tracing and Clonal Analysis in Developing Cerebral Cortex Using Mosaic Analysis with Double Markers (MADM)
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Cell evolution: On the origin of Cajal-Retzius cells.

Soledad Pérez-Sánchez1, Víctor Borrell1

  • 1Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant 03550, Spain.

Current Biology : CB
|June 8, 2026
PubMed
Summary

Cajal-Retzius cells, crucial for brain development, likely evolved from an ancestral cell family, representing a significant evolutionary innovation in mammals. This study reveals their specialized origin, impacting our understanding of neocortical evolution.

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Area of Science:

  • Developmental Biology
  • Evolutionary Biology
  • Neuroscience

Background:

  • Cajal-Retzius cells are vital for mammalian neocortical development.
  • These cells are considered a key evolutionary innovation in mammals.
  • Their precise evolutionary origin has remained unclear.

Purpose of the Study:

  • To investigate the evolutionary origin of Cajal-Retzius cells.
  • To determine if Cajal-Retzius cells arose from a specialized ancestral cell population.

Main Methods:

  • Comparative genomics analysis.
  • Developmental lineage tracing studies.
  • Molecular marker analysis across species.

Main Results:

  • Evidence suggests Cajal-Retzius cells evolved through specialization.
  • These cells likely originated from a conserved ancestral cell family.
  • The findings support a model of gradual evolutionary refinement.

Conclusions:

  • Cajal-Retzius cells are not a de novo invention but evolved from pre-existing cell types.
  • This specialization event was critical for the development of the mammalian neocortex.
  • Understanding this origin sheds light on mammalian brain evolution.