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The Genetics of Primary Microcephaly.

Divya Jayaraman1,2,3, Byoung-Il Bae4, Christopher A Walsh1,5,6

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Primary microcephaly (MCPH) is a rare genetic brain development disorder. Studying MCPH genes reveals critical molecular mechanisms regulating neural progenitor cells and brain size.

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Area of Science:

  • Genetics
  • Developmental Biology
  • Neuroscience

Background:

  • Primary microcephaly (MCPH) is a rare genetic disorder characterized by a head circumference more than 3 standard deviations below the mean.
  • Causes of MCPH are diverse, including toxic exposures, infections, and metabolic conditions, alongside genetic factors.
  • Studying MCPH provides insights into neural progenitor cell regulation, brain size determination, and human brain evolution.

Purpose of the Study:

  • To explore the diverse genetic and molecular mechanisms underlying primary microcephaly.
  • To highlight the role of MCPH genes in regulating cerebral cortical size during development.

Main Methods:

  • Review of recent gene discoveries and functional studies related to MCPH.
  • Analysis of implicated cellular processes and molecular pathways.

Main Results:

  • Many MCPH genes encode centrosomal proteins crucial for centriole biogenesis.
  • Other MCPH genes are involved in DNA replication and repair.
  • Novel implicated processes include cytokinesis, Wnt signaling, autophagy, and apical polarity complex function.

Conclusions:

  • MCPH genes regulate a wide array of molecular and cellular mechanisms.
  • These mechanisms are critical for controlling cerebral cortical size during development.
  • Understanding MCPH advances knowledge of brain development and evolution.