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Related Concept Videos

Pedigree Analysis01:35

Pedigree Analysis

Overview
X-linked Traits01:19

X-linked Traits

In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
X-linked Traits01:19

X-linked Traits

In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
Sex-linked Disorders01:43

Sex-linked Disorders

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.
Genetic Screens02:46

Genetic Screens

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...
Position-effect Variegation02:32

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.

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Related Experiment Video

Updated: Jun 12, 2026

FISH for Pre-implantation Genetic Diagnosis
07:34

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Published on: February 23, 2011

Familial X;Y translocation with distinct phenotypic consequences: Characterization using FISH and array CGH.

N Bukvic1, V Delli Carri, M L Di Cosola

  • 1Genetica Medica, Dipartimento di Scienze Biomediche, Università degli Studi di Foggia, Foggia, Italy. nenadbukvic@virgilio.it

American Journal of Medical Genetics. Part A
|June 26, 2010
PubMed
Summary

X;Y translocations are rare chromosomal abnormalities. This study details a family with Xp;Yq translocation, linking specific deletions to variable contiguous gene syndromes in males, impacting traits like short stature and developmental delays.

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Area of Science:

  • Genetics
  • Human Genetics
  • Cytogenetics

Background:

  • X;Y translocations are uncommon chromosomal rearrangements with breakpoints typically at Xp22 and Yq11.
  • These aberrations can lead to contiguous gene syndromes in males due to nullisomy of deleted regions.
  • Phenotypic variability in males depends on the extent and location of the deletion.

Observation:

  • This study investigated a family with an Xp;Yq translocation using clinical, cytogenetic, FISH, and array CGH analyses.
  • Patient 1 exhibited a 46,Y,der(X),t(X;Y)(p22;q12) karyotype with deletions in Xp22.31-p22.33 and duplication in Yq11.221-qter.
  • Patient 2 presented with a 46,X,der(X),t(X;Y)(p22;q12) karyotype, showing deletion in Xp22.31-p22.33 and deletion in Yq11.221-qter.

Findings:

  • The study identified specific deletion and duplication patterns associated with the Xp;Yq translocation in the affected family members.
  • Array CGH revealed distinct genetic imbalances on the X and Y chromosomes correlating with observed phenotypes.
  • The breakpoints were precisely mapped, providing detailed genetic information about the translocation.

Implications:

  • Understanding the genetic basis of Xp;Yq translocations is crucial for diagnosing and counseling affected families.
  • This research contributes to the knowledge of contiguous gene syndromes and genotype-phenotype correlations.
  • Detailed cytogenetic and molecular analyses are essential for characterizing complex chromosomal rearrangements and their clinical consequences.