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Related Concept Videos

Complementation Tests00:49

Complementation Tests

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A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
Organisms heterozygous for different mutations are crossed pairwise in all combinations. If present on different genes, the mutations can complement each other by providing the missing...
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Pleiotropy01:33

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Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
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Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
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Related Experiment Video

Updated: Mar 6, 2026

A Novel Strategy Combining Array-CGH, Whole-exome Sequencing and In Utero Electroporation in Rodents to Identify Causative Genes for Brain Malformations
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Fanconi anemia: correlating central nervous system malformations and genetic complementation groups.

Benjamin A Johnson-Tesch1, Rakhee S Gawande2, Lei Zhang3

  • 1Department of Radiology, University of Minnesota, MMC 292, 420 Delaware St. SE, Minneapolis, MN, 55455, USA. joh04737@umn.edu.

Pediatric Radiology
|March 12, 2017
PubMed
Summary

Fanconi anemia patients often have central nervous system abnormalities, particularly those with BRCA2 mutations. These findings highlight the importance of genetic complementation groups in understanding these congenital conditions.

Keywords:
BRCA2Central nervous systemChildrenCongenitalFanconi anemiaPontocerebellar hypoplasiaRadiology

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Area of Science:

  • Neuroscience
  • Genetics
  • Pediatrics

Background:

  • Fanconi anemia (FA) is a rare genetic disorder.
  • Congenital central nervous system (CNS) abnormalities in FA are not well understood.
  • Specific genetic complementation groups' impact on CNS malformations requires further characterization.

Purpose of the Study:

  • To investigate the relationship between genetic complementation groups and CNS anatomy in Fanconi anemia patients.
  • To identify specific CNS abnormalities associated with different FA genotypes.
  • To compare the prevalence of CNS abnormalities in FA patients versus healthy controls.

Main Methods:

  • Retrospective chart review of 36 FA patients with brain MRIs.
  • Comparison with 19 age- and sex-matched controls.
  • Genotyping for 27 FA patients, including FA-A, FA-C, FA-G, and FA-D1 (BRCA2 mutations).

Main Results:

  • 61% of FA patients exhibited CNS or skull base abnormalities.
  • Common abnormalities included hypoplastic clivus, adenohypophysis, and platybasia.
  • FA-D1 patients showed a higher incidence of pontocerebellar hypoplasia and had shorter clivus lengths compared to controls.

Conclusions:

  • Fanconi anemia patients demonstrate increased rates of midline CNS and skull base abnormalities.
  • Posterior fossa malformations, such as pontocerebellar hypoplasia, are strongly associated with biallelic BRCA2 mutations (FA-D1).
  • Genetic background significantly influences the spectrum of CNS abnormalities in Fanconi anemia.