Related Experiment Video
Updated: Aug 13, 2026

06:41
In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila
Published on: August 20, 2019
Ehlers Danlos syndrome in two siblings
1Department of Dermatology, Venereology and Leprosy, JLN Hospital and Research Centre, Bhilai Steel Plant, Bhiali, India. sysantosh@yahoo.com
Indian Journal of Dermatology, Venereology and Leprology
|January 6, 2006
Summary
This report details two brothers with Ehlers-Danlos syndrome, a connective tissue disorder. They exhibited skin hyperextensibility, joint hypermobility, and scarring, with the elder brother showing additional kyphoscoliosis and hypogonadism.
Area of Science:
- Genetics and Human Physiology
- Connective Tissue Disorders
Background:
- Ehlers-Danlos syndrome (EDS) is a group of inherited connective tissue disorders.
- It is characterized by joint hypermobility, skin hyperextensibility, and tissue fragility.
Observation:
- Two brothers presented with classic features of Ehlers-Danlos syndrome.
- Both exhibited skin atrophy, hyperextensibility, joint hypermobility, and scarring at trauma sites.
- The elder brother also presented with kyphoscoliosis and hypogonadism, indicating potential systemic involvement.
Findings:
- The cases highlight the variable phenotypic expression of Ehlers-Danlos syndrome within a family.
- Specific symptoms like kyphoscoliosis and hypogonadism may indicate specific subtypes or complications of EDS.
- Genetic factors likely play a significant role in the presentation and severity of EDS.
Implications:
- These cases underscore the importance of comprehensive clinical evaluation in diagnosing Ehlers-Danlos syndrome.
- Further research into the genetic underpinnings of EDS is crucial for targeted therapies.
- Understanding the spectrum of EDS manifestations aids in predicting patient outcomes and managing associated conditions.
More Related Videos
Related Concept Videos
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.
Genomic Imprinting and Inheritance
Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
Nondisjunction
During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
Pedigree Analysis
Overview
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.
Lethal Alleles
Agouti: A Lethal Allele
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...

