Related Experiment Video
Updated: Aug 6, 2026
08:14
Induction and Diagnosis of Tumors in Drosophila Imaginal Disc Epithelia
Published on: July 25, 2017
[Kniest's dysplasia]
1Bezirkskrankenhaus--Sliven, VR Bulgarien.
Radiologia Diagnostica
|January 1, 1990
Summary
Kniest
Area of Science:
- Genetics
- Skeletal Dysplasias
- Connective Tissue Disorders
Background:
- Kniest's dysplasia is a rare skeletal dysplasia characterized by disproportionate short stature and skeletal abnormalities.
- It is typically caused by mutations in the type II collagen gene (COL2A1).
Observation:
- This study describes three female patients with Kniest's dysplasia.
- Two patients from the same family exhibited only skeletal defects.
- A third patient presented with skeletal defects along with additional symptoms affecting tendons, sclerae, eye lenses, retinal vessels, and hearing.
Findings:
- The observed clinical heterogeneity suggests genetic variations within Kniest's dysplasia.
- These variations lead to differing manifestations, ranging from skeletal-only defects to systemic involvement due to collagen deficiency.
Implications:
- Understanding these genetic variations is crucial for accurate diagnosis and genetic counseling.
- Further research into the molecular mechanisms underlying these variations can inform potential therapeutic strategies for Kniest's dysplasia and related collagenopathies.
Related Concept Videos
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.
01:29Nondisjunction
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.
01:09Cytoskeletal Linker Proteins - Plakins
Plakins are large proteins with binding domains for microtubules, microfilaments, intermediate filaments, and membrane-associated protein complexes at cell junctions. Plakin functions are evolutionarily conserved and are primarily involved in organizing the different components of the cytoskeleton by crosslinking them to each other and connecting them to the cell-matrix and cell adhesion complexes. They are also known to interact with signal transducers, serve as scaffolds for signaling...
01:21Nondisjunction
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers. Nondisjunction is common during anaphase I or anaphase II of meiosis. Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold sister...
01:29Bone Disorders
Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
01:24Cellular Adaptation IV: Dysplasia and Metaplasia
DysplasiaDysplasia refers to abnormal changes in the size, shape, and organization of mature cells, characterized by pleomorphism, nuclear abnormalities, and increased mitotic activity. It commonly affects epithelial tissues, including the cervix, gastrointestinal tract, respiratory mucosa, and endometrium. Although it may occur alongside hyperplasia, dysplasia is not a true adaptive response but a preneoplastic change with potential to progress to cancer.When confined above the basement...