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Karyotyping01:17

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...
Genetic Screens02:46

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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
Forward or “classical” genetic screens involve creating random mutations in an organism’s DNA using radiation, mutagens, or insertion of additional bases, which result in visible changes...

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Related Experiment Video

Updated: Jun 17, 2026

Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants
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Newborn screening programs: should 22q11 deletion syndrome be added?

Abigail M Bales1, Christina A Zaleski, Elizabeth W McPherson

  • 1Department of Medical Genetic Services, Marshfield Clinic, Marshfield, Wisconsin 54449, USA. mcpherson.elizabeth@marshfieldclinic.org

Genetics in Medicine : Official Journal of the American College of Medical Genetics
|January 15, 2010
PubMed
Summary

Newborn screening for 22q11 deletion syndrome is debated. While it could detect severe issues like heart defects, concerns exist regarding screening effectiveness and potential harms.

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Area of Science:

  • Genetics
  • Pediatrics
  • Public Health

Background:

  • 22q11 deletion syndrome (22q11DS) is highly variable and proposed for newborn screening.
  • Key complications include cardiac defects (80%), hypocalcemia (20%), and immune deficiency (<1%).
  • Current screening methods may miss significant complications or be inefficient.

Purpose of the Study:

  • To review the literature on 22q11DS incidence, features, and prognosis.
  • To evaluate the potential benefits and drawbacks of adding 22q11DS to newborn screening panels.
  • To consider the implications for newborn screening criteria.

Main Methods:

  • Literature review of 22q11 deletion syndrome and newborn screening.
  • Analysis of incidence, prevalence, clinical features, and prognosis.
  • Assessment of screening benefits, risks, and logistical challenges.

Main Results:

  • 22q11DS has high variability; severe complications affect a minority but can be life-threatening.
  • Screening benefits include early detection of cardiac defects and hypocalcemia, but concerns about technique and timing exist.
  • Alternative methods may detect congenital heart disease more efficiently.

Conclusions:

  • Universal screening for 22q11DS presents challenges and potential harms, including untested techniques and "vulnerable child syndrome."
  • The addition of 22q11DS screening may set a precedent, necessitating a reevaluation of newborn screening criteria.
  • Careful consideration of benefits versus risks is crucial for highly variable conditions.