Related Experiment Video
Updated: Jul 13, 2026
13:55
Combined Immunofluorescence and DNA FISH on 3D-preserved Interphase Nuclei to Study Changes in 3D Nuclear Organization
Published on: February 3, 2013
A novel X-linked combined immunodeficiency disease
E G Brooks1, F C Schmalstieg, D P Wirt
1Department of Pediatrics, University of Texas Medical Branch, Galveston 77550.
The Journal of Clinical Investigation
|November 1, 1990
Summary
A new X-linked combined immunodeficiency disease was identified in males, characterized by immune dysregulation and recurrent infections. This distinct disorder affects T-cell populations and antibody production, requiring further investigation.
Area of Science:
- Immunology
- Genetics
- Human Pathology
Background:
- Combined immunodeficiency diseases (CIDs) are a group of rare genetic disorders affecting the innate and adaptive immune systems.
- X-linked inheritance patterns are observed in several known CID subtypes, impacting males predominantly.
Observation:
- A novel X-linked CID was identified in five males from an extended family in the United States.
- Affected individuals presented with a paucity of lymphoid tissue, recurrent sinopulmonary infections, severe varicella, and chronic human papillomavirus (HPV) infections.
Findings:
- Immunological evaluation revealed normal serum immunoglobulin levels but restricted IgG antibody formation.
- Key findings included normal B and NK cell counts, but decreased CD4+ and CD8+ T lymphocytes, particularly CD45RA+ subpopulations.
- Diminished T-cell proliferation and reduced interleukin-2 (IL-2) production were observed.
Implications:
- This novel disorder represents a distinct form of combined immunodeficiency, differing from previously described X-linked CIDs.
- Understanding the genetic basis and immunological characteristics of this condition is crucial for accurate diagnosis and potential therapeutic strategies.
- Further research into the specific gene defect and its downstream effects on T-cell development and function is warranted.
Related Concept Videos
01:19X-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”.
01:43Sex-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.
01:19X-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”.
01:43Sex 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.
02:32Exon Recombination
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Exon shuffling follows “splice frame rules.” Each exon has three reading...
01:25Immunodeficiency Diseases
Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
There are three main causes of immunodeficiency disorders...
There are three main causes of immunodeficiency disorders...