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Congenital microcephaly-linked CDK5RAP2 affects eye development.

Sami Zaqout1,2,3,4,5, Ethiraj Ravindran1,2,3,4, Gisela Stoltenburg-Didinger1

  • 1Institute of Cell and Neurobiology, Charité - Universitätsmedizin Berlin, Berlin, Germany.

Annals of Human Genetics
|July 30, 2019
PubMed
Summary
This summary is machine-generated.

Mutations in the CDK5RAP2 gene cause primary microcephaly (MCPH3). This study reveals CDK5RAP2 is crucial for eye development, with mutant mice showing severe eye malformations and increased cell death in the retina.

Keywords:
CDK5RAP2cataracteye developmentmicrocephalymicrophthalmia

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Area of Science:

  • Developmental Biology
  • Genetics
  • Ophthalmology

Background:

  • Autosomal recessive primary microcephaly type 3 (MCPH3) is linked to biallelic mutations in the CDK5RAP2 gene.
  • MCPH3 typically presents with intellectual disability and microcephaly, with no other organ involvement historically reported.
  • Recent reports suggest a potential association between MCPH3 and congenital cataracts, but further evidence was needed.

Purpose of the Study:

  • To investigate the role of CDK5RAP2 in eye development.
  • To determine if CDK5RAP2 mutations are causally linked to ocular abnormalities observed in MCPH3 patients.

Main Methods:

  • Analysis of Cdk5rap2 mutant mice (an/an) to assess ocular phenotypes.
  • Histological examination of retinal progenitor cells.
  • Assessment of apoptosis and cell proliferation in the retina.

Main Results:

  • A significant proportion of Cdk5rap2 mutant mice exhibited eye malformations, including microphthalmia (reduced eye size) and anophthalmia (absent eyes).
  • Elevated levels of apoptosis were observed in the retinal progenitor cells of mutant mice.
  • An increase in mitotic cells within the an/an retinal progenitor cell population was detected.

Conclusions:

  • The study provides strong evidence supporting a causal link between CDK5RAP2 and normal eye development.
  • Cdk5rap2 plays a critical role in regulating cell survival and proliferation during eye development.
  • Disruption of CDK5RAP2 function can lead to severe ocular malformations.