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Classification of Bones

Classification of Bones

The bones of the human skeletal system are of varied shapes, sizes, and functions. They can be classified based on their shape and function into four major classes: long bones, short bones, flat bones, and irregular bones. Some classifications include a fifth type, the sesamoid bones, as a separate class, whereas others categorize them under short bones.
Long and Short Bones
The appendicular skeleton, particularly the upper and lower limbs, is primarily made of long and short bones. The...

Cohesins

Cohesins

Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of...

Classification of Skeletal Muscle Fibers

Classification of Skeletal Muscle Fibers

Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
Slow-Twitch Muscle Fibers
Slow oxidative, muscle fibers appear red due to large numbers of capillaries and high levels of...

Incomplete Dominance

Incomplete Dominance

Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.

Classification of Skeletal Muscle Relaxants

Classification of Skeletal Muscle Relaxants

Skeletal muscle relaxants are a group of drugs that can reduce muscle stiffness and induce temporary paralysis to relieve pain. These agents can act centrally to reduce muscle tone or spasms in painful conditions such as multiple sclerosis (MS), amyotrophic lateral sclerosis (ALS), or spinal injuries; they are called antispasmodics or spasmolytics.
Peripherally acting skeletal muscle relaxants interfere with the neurotransmission at the neuromuscular end plate to induce paralysis during...

Karyotyping

Karyotyping

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Related Experiment Video

Updated: Jan 10, 2026

Selecting Multiple Biomarker Subsets with Similarly Effective Binary Classification Performances

Selecting Multiple Biomarker Subsets with Similarly Effective Binary Classification Performances

Published on: October 11, 2018

Evidence-based classification of genes implicated in skeletal disorders using the ClinGen curation framework.

Ryan F Webb¹, Hannah McCurry¹, Amanda Girod¹

¹Program in Medical and Population Genetics, Broad Institute of MIT and Harvard, Cambridge, MA 02142, United States.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research

|November 28, 2025

Summary

This summary is machine-generated.

The ClinGen Skeletal Disorders Gene Curation Expert Panel definitively linked nine key genes to skeletal dysplasias. This genetic evidence strengthens diagnostic panels for skeletal diseases.

Keywords:

ClinGen gene-disease validity genomic medicine skeletal skeletal disorder skeletal dysplasia

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Targeted Next-generation Sequencing and Bioinformatics Pipeline to Evaluate Genetic Determinants of Constitutional Disease

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Published on: April 4, 2018

Area of Science:

Genetics
Skeletal Biology
Clinical Diagnostics

Background:

Over 770 genetic skeletal disorders are known, linked to more than 550 genes.
Accurate gene-disease relationship data is crucial for clinical genetic testing panels.
The ClinGen Skeletal Disorders Gene Curation Expert Panel aims to validate these relationships.

Purpose of the Study:

To assess the clinical validity of gene-disease relationships for common skeletal dysplasias.
To evaluate nine specific genes (COL1A1, COL1A2, COL2A1, FGFR3, SLC26A2, TRPV4, COMP, ALPL, SOX9) implicated in skeletal disorders.
To inform clinical testing laboratories about reliable gene targets for diagnostic panels.

Main Methods:

Utilized a semi-quantitative scoring framework developed by ClinGen.
Reviewed medical literature for nine genes associated with 26 distinct skeletal disorders.
Assessed the strength of evidence for each gene-disease association.

Main Results:

All nine genes showed definitive associations with at least one skeletal disorder.
Out of 26 evaluated gene-disease relationships, 22 (84.6%) were classified as Definitive.
Two relationships were classified as Moderate and two as Limited, requiring further data for confirmation.

Conclusions:

The ClinGen Skeletal Disorders Gene Curation Expert Panel established definitive links between nine genes and skeletal disorders.
The findings enhance the accuracy and reliability of genetic testing for skeletal diseases.
Further research is needed to upgrade Moderate and Limited gene-disease relationships to Definitive status.