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Related Concept Videos

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Multiple comparison test, abbreviated as MCT, is a post hoc analysis generally performed after comparing multiple samples with one or more tests. An MCT will help identify a significantly different sample among multiple samples or a factor among multiple factors.
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Cochran's Q Test is a nonparametric statistical test used to determine if there are potential differences in the outcomes of three or more related groups on a binary (yes/no) or dichotomous outcome. It is essentially an extension of the McNemar Test, which is limited to two related samples - Cochran's Q test can handle three or more related samples, making it more versatile in scenarios where subjects are measured under multiple conditions. The test statistic follows a Chi-Square...
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Testing With Intent in Mosaic Conditions: A Case-Based Review.

Andrew J Kerwin1, Ana L Lop1, Kristyn Vicente2

  • 1Department of Genetics, Florida International University, Herbert Wertheim College of Medicine, Miami, USA.

Cureus
|January 1, 2024
PubMed
Summary

Genetic mosaicism, the presence of different cell lineages in one organism, is more common than previously thought. Understanding its mechanisms aids targeted testing, reducing diagnostic delays and improving genetic counseling for conditions like Pallister-Killian syndrome.

Keywords:
diagnostic odysseygenetic testingmosaicismpallister-killian syndrometissue samplingtuberous sclerosis complex

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Area of Science:

  • Genetics
  • Developmental Biology
  • Medical Genetics

Background:

  • Mosaicism, defined as the presence of two distinct cell lineages within an organism, arises from post-zygotic mutations or chromosomal errors.
  • This phenomenon can occur early in development, impacting various tissues in a pattern-specific manner.

Observation:

  • Genetic testing may yield negative results from standard tissue samples if the variant is present in other, untested tissues.
  • Mosaic conditions often present with variable expressivity and reduced severity compared to germline mutations.
  • Two cases, Pallister-Killian syndrome and tuberous sclerosis complex, illustrate diagnostic challenges due to mosaicism.

Findings:

  • The timing and mechanisms of mosaicism influence the tissue distribution of genetic variants.
  • Tissue-dependent variant patterns can lead to prolonged diagnostic odysseys.
  • Identifying affected germ layers aids in selecting appropriate tissues for diagnostic testing.

Implications:

  • Targeted genetic testing strategies informed by the understanding of mosaicism mechanisms can shorten the diagnostic timeline.
  • Accurate identification of mosaic variants improves the assessment of recurrence risks for offspring.
  • Enhanced genetic counseling and more precise patient management are facilitated by recognizing and characterizing mosaic conditions.