Related Experiment Video
Updated: Oct 1, 2025
Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification
Published on: December 3, 2016
Changes in skeletal dysplasia nosology
Maria Claudia Jurcă1, Sânziana Iulia Jurcă, Filip Mirodot
1Department of Genetics, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania; emilia.severin@umfcd.ro; Faculty of Medicine and Pharmacy, University of Oradea, Romania; berceabogdan95@gmail.com.
Insights
Skeletal dysplasias (SDs) are a group of over 400 bone growth disorders. The 2019 International Skeletal Dysplasia Society classification, aided by genetic sequencing, improves diagnosis and understanding of these rare diseases.
Area of Science:
- Genetics
- Orthopedics
- Medical Genetics
Background:
- Skeletal dysplasia (SD), or osteochondrodysplasia (OCD), encompasses over 400 distinct genetic disorders affecting bone development and growth.
- While individually rare, SDs collectively occur in approximately 1:5000 births, presenting diverse clinical features, prognoses, and inheritance patterns.
- Accurate classification is crucial for diagnosis, especially with advancements in genetic sequencing.
Purpose of the Study:
- To highlight the importance of nosology in classifying skeletal dysplasias.
- To present the updated 2019 International Skeletal Dysplasia Society (ISDS) classification.
- To emphasize the role of molecular genetics and genotype-phenotype correlations in diagnosing SDs.
Main Methods:
- Review of historical and current classification systems for skeletal dysplasias.
- Integration of clinical, radiological, and molecular data.
- Application of next-generation sequencing technologies.
Main Results:
- The 2019 ISDS classification organizes SDs into 42 major groups comprising 461 entities.
- Next-generation sequencing has identified 437 genes associated with 426 (92.4%) of SDs.
- Genotype-phenotype correlations are increasingly vital for accurate diagnosis and understanding of SDs.
Conclusions:
- The updated nosology provides a robust framework for classifying skeletal dysplasias.
- Molecular genetic advancements significantly enhance diagnostic accuracy for SDs.
- This classification aids clinicians in diagnosing patients and interpreting novel genetic variants.
Abstract:
Skeletal dysplasia (SD), also called osteochondrodysplasia (OCD), is a large group of skeletal disorders (over 400 distinct entities) caused by abnormalities in bone development and growth. SDs varies according to different natural histories, prognoses, hereditary patterns to etiopathogenetic mechanisms. At birth, the incidence is low, reported at the level of each entity, but taken collectively; the incidence is estimated at 1:5000 births. Nosology is a branch of medical science. It deals with the systematic classification of diseases and disorders. Thus, combining information about the catalogue of clinically distinct disorders, pending molecular explanations, and genotype-phenotype correlations, the classification of SDs will be more accurate. This is extremely useful for diagnosing patients with genetic skeletal diseases, especially given the expected flow of information with new sequencing technologies. Over the years, various terms and classifications of SD have been used and have attempted to order and classify this group of genetic diseases according to clinical, radiological, and molecular criteria. In 2019, the Nosology Committee of the International Skeletal Dysplasia Society (ISDS) updated the classification of SD. This new classification divides SD into 42 large groups that include 461 entities. Advances in next-generation sequencing techniques have revolutionized the entire field of genetics, with 437 different genes are currently identified in 426 (92.4%) of SDs. Nosology is a real help for the clinician in establishing a diagnosis as accurately as possible, for the recognition of new diseases while serving as a guide for the interpretation of new genetic variants.
Related Concept Videos
01:09Changes in the Appendicular Skeleton with Age
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
01:20Introduction to the Skeletal System
Components of the Skeletal System
Bone, or osseous tissue, is a hard connective tissue that forms an internal support structure for the human body. Bones shield vulnerable organs and soft tissue from external forces. For example, the vertebral bones protect and support the spinal cord.
Cartilage, a semi-rigid connective tissue found in regions such as...
01:29Bone Disorders
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...
01:18Classification of Bones
Long and Short Bones
The appendicular skeleton, particularly the upper and lower limbs, is primarily made of long and short bones. The...
01:21Nondisjunction
01:29Bone Formation by Intramembranous Ossification
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into ...