COMP
cartilage oligomeric matrix protein
Normal Function
Health Conditions Related to Genetic Changes
Multiple epiphyseal dysplasia
More than 20 mutations in the COMP gene that cause dominant multiple epiphyseal dysplasia have been identified. This disorder can also be caused by mutations in four other genes; however, the majority of individuals have mutations in the COMP gene.
Mutations in the COMP gene that cause dominant multiple epiphyseal dysplasia change one protein building block (amino acid) or result in small additions or deletions of amino acids in the COMP protein. All identified mutations have occurred in two regions of the COMP protein, which are referred to as the type III and C-terminal domains. COMP mutations lead to the improper folding of the COMP protein in the endoplasmic reticulum, a structure in the cell involved in protein processing and transport. The abnormal COMP protein is unable to leave the endoplasmic reticulum, which causes this cellular structure to enlarge. The endoplasmic reticulum eventually becomes so large that it is no longer able to function normally, and the chondrocyte dies. The premature death of chondrocytes results in diminished growth of the long bones and short stature.
Researchers believe that the lack of COMP protein in the spaces between the chondrocytes leads to the formation of abnormal cartilage. This abnormal cartilage probably breaks down easily, which results in early-onset osteoarthritis.
More About This Health ConditionRelated Conditions
Multiple epiphyseal dysplasiaPseudoachondroplasia
Health Conditions Related to Genetic Changes
More than 20 mutations in the COMP gene that cause dominant multiple epiphyseal dysplasia have been identified. This disorder can also be caused by mutations in four other genes; however, the majority of individuals have mutations in the COMP gene.
Mutations in the COMP gene that cause dominant multiple epiphyseal dysplasia change one protein building block (amino acid) or result in small additions or deletions of amino acids in the COMP protein. All identified mutations have occurred in two regions of the COMP protein, which are referred to as the type III and C-terminal domains. COMP mutations lead to the improper folding of the COMP protein in the endoplasmic reticulum, a structure in the cell involved in protein processing and transport. The abnormal COMP protein is unable to leave the endoplasmic reticulum, which causes this cellular structure to enlarge. The endoplasmic reticulum eventually becomes so large that it is no longer able to function normally, and the chondrocyte dies. The premature death of chondrocytes results in diminished growth of the long bones and short stature.
Researchers believe that the lack of COMP protein in the spaces between the chondrocytes leads to the formation of abnormal cartilage. This abnormal cartilage probably breaks down easily, which results in early-onset osteoarthritis.
About 60 mutations in the COMP gene have been identified in individuals with pseudoachondroplasia. One particular mutation is found in approximately 30 percent of affected individuals. This mutation results in the deletion of a single amino acid, called aspartic acid, in the COMP protein. This gene mutation is usually written as 469delD or D469del. Most other COMP gene mutations involve the substitution of one amino acid for another amino acid in the COMP protein.
Mutations in the COMP gene that cause pseudoachondroplasia also result in the buildup of COMP protein in the endoplasmic reticulum and eventual chondrocyte death. It is not clear why some mutations in the COMP gene cause pseudoachondroplasia and other mutations cause dominant multiple epiphyseal dysplasia.