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Related Concept Videos

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Genetic screens are tools used to identify genes and mutations responsible for phenotypes of interest. Genetic screens help identify individuals or a group of people at risk of developing  genetic diseases and help them with early intervention, targeted therapy, and reproductive options.
Forward genetic screens
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Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.  
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Updated: Apr 27, 2026

Identification of Functionally-Relevant Lentivirus Integration Sites in an Insertional Mutagenesis Cell Library
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Genome wide functional genetics in haploid cells.

Ulrich Elling1, Josef M Penninger1

  • 1IMBA, Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Dr. Bohr Gasse 3, 1030 Vienna, Austria.

FEBS Letters
|June 21, 2014
PubMed
Summary

Mammalian haploid stem cells were generated, enabling powerful genetic screens. This approach offers a scalable alternative to RNA interference or CRISPR-Cas9 for biological discovery.

Keywords:
Functional genomicsHaploid ES cellsHaploid genetic screens

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Area of Science:

  • Genetics
  • Developmental Biology
  • Stem Cell Biology

Background:

  • Haploid organisms, like yeast, facilitate genetic analysis due to a single genome copy.
  • Mammalian cells are typically diploid, complicating genetic screens.
  • Previous research utilized near-haploid human leukemic cells for screening.

Purpose of the Study:

  • To generate mammalian haploid embryonic stem cells.
  • To establish a powerful tool for large-scale genetic analysis in mammals.
  • To leverage haploid genetics for uncovering fundamental biological processes.

Main Methods:

  • Generation of haploid embryonic stem cells from parthenogenetic mouse embryos.
  • Utilizing haploid stem cells for high-throughput genetic screening.
  • Comparing haploid genetics to RNA interference (RNAi) and CRISPR-based screens.

Main Results:

  • Successful generation of viable mammalian haploid embryonic stem cells.
  • Demonstration of haploid stem cells as a powerful screening platform.
  • Haploid genetics provides a scalable alternative to existing screening methods.

Conclusions:

  • Mammalian haploid stem cells combine haploid genetics with pluripotency.
  • This breakthrough enables genomic-scale investigation of biological processes.
  • Haploid genetics is a potent tool for biological discovery, complementing RNAi and CRISPR.