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Mutations01:39

Mutations

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A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
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Loss-of-function mutations in FREM2 disrupt eye morphogenesis.

Xiayin Zhang1, Dongni Wang1, Meimei Dongye1

  • 1State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, 510060, China.

Experimental Eye Research
|February 26, 2019
PubMed
Summary
This summary is machine-generated.

This study identifies new mutations in the FREM2 gene causing isolated cryptophthalmos, a rare congenital disorder affecting eyelid development. Researchers developed a mouse model to study the condition, offering insights for prenatal diagnosis and treatment.

Keywords:
Development of eyelidsFREM2 mutationGenotype–phenotype correlationIsolated cryptophthalmosOcular abnormalities

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Area of Science:

  • Genetics and Developmental Biology
  • Ophthalmology

Background:

  • Cryptophthalmos is a rare congenital disorder involving ocular and eyelid malformations.
  • It is characterized by skin covering the eyes and fused eyelids.

Purpose of the Study:

  • To characterize clinical manifestations of isolated bilateral cryptophthalmos.
  • To investigate the role of the FREM2 gene in this condition.
  • To establish and validate a mouse model for cryptophthalmos research.

Main Methods:

  • Clinical evaluation of three patients with isolated bilateral cryptophthalmos.
  • Genetic analysis to identify mutations in the FREM2 gene.
  • CRISPR/Cas9 gene editing to create a mouse model (Frem2R725X/R2156W).
  • RNA sequencing (RNA-seq) of fetal mutant mice.

Main Results:

  • Identified novel compound heterozygous mutations in the FREM2 gene in patients.
  • The generated mouse model recapitulated the human cryptophthalmos phenotype.
  • Detected FREM2 expression in the retina of affected eyes.
  • Identified differentially expressed genes in fetal mutant mice.

Conclusions:

  • Expands the known spectrum of FREM2 mutations associated with cryptophthalmos.
  • Highlights FREM2's crucial role in eyelid and eye development.
  • Provides a valuable animal model for studying cryptophthalmos pathogenesis and eyelid development.
  • Offers insights for potential prenatal diagnosis of isolated cryptophthalmos.