Chemistry: molecular biology and microbiology – Measuring or testing process involving enzymes or... – Involving nucleic acid
Patent
1995-02-03
1999-09-07
Horlick, Kenneth R.
Chemistry: molecular biology and microbiology
Measuring or testing process involving enzymes or...
Involving nucleic acid
435 912, 536 2431, 536 2433, C12Q 168, C12P 1934, C07H 2104
Patent
active
059486112
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to the field of compounds and methods for detecting genetic diseases linked to anomalies of genes for collagens and other structural proteins found in cartilage and joints.
BACKGROUND OF THE INVENTION
Osteoarthritis is a progressive disease of joints that is a cause of serious disability in large numbers of people. The disease is defined as a progressive degeneration of the cartilaginous surfaces of joints that leads to stiffness, pain, and loss of mobility. Degeneration of the cartilaginous surface of joints seen in osteoarthritis can have a number of causes. For example, severe trauma to a joint or a bacterial infection in a joint can produce degeneration of the joint that is either immediate or slowly progressive over many years. A number of metabolic disturbances are also know to produce degeneration of joints.
Cartilage and membranes that line joints are complex structures. A major source of the strength of cartilage is the fibrils of type II collagen. The fibrils of type II collagen are stretched into three-dimensional arcades primarily by the presence of another group of macromolecules called proteoglycans. Proteoglycans are highly charged and, therefore, absorb water and salts and thereby extend the arcades of type II collagen fibrils. As a result, a highly resilient structure is formed that can withstand the intermittent pounding and pressures that joints must undergo. In addition to proteoglycans and type II collagen, cartilage is known to contain at least four other kinds of collagens (types VI, IX, X and XI) in lesser amounts than type II collagen. It is very likely that additional collagens will be discovered in cartilage in the future. In addition, it is clear that the matrix of cartilage also contains a number of other proteins that are still poorly characterized and that may contribute to the structure and function of the tissue.
Collagens, proteoglycans and other proteins found in the matrix of cartilage are synthesized by cells embedded within the matrix. The matrix is actively synthesized during embryonic development of certain tissues and during periods of growth. The rates of synthesis and degradation of the matrix are less during adult life. However, throughout life, a continual slow synthesis and degradation of cartilage occurs, particularly in response to the pressures associated with physical activity.
Cartilage itself has several different functions in the body. During embryonic development, transient tracks of type II collagen and probably other components of cartilage are formed in many structures. The tracks appear to serve as a guide for cell migration and a template for formatting of skeleton and associated structures. in addition, cartilage serves as a precursor structure for many bones. During the development of long bones such as those of the arms and legs, cartilage is part of the growth plate in which cell growth occurs. More specifically, the cartilage grows away from the midpoint of the long bone and is continually degraded and gradually replaced by bone itself. An additional function of cartilage is to give shape and form to tissues such as the nose and ears. Many of the macromolecules found in cartilage are also present in the vitreous gel of the eye and account for the high viscosity of the vitreous. Still another major function of cartilage is to provide strength and resilience to structures such as the intervertebral disc of the spine. In joints, it provides not only strength and resilience, but also the smooth surfaces for motion under heavy loads.
The degeneration of joint cartilages that occurs in osteoarthritis is caused by a failure of the cartilage to maintain its structural integrity. In this process, the cartilage surface is eroded by physical pressures and is not adequately replaced by the new synthesis of cartilage. Instead of adequate repair of cartilage, secondary changes occur in the joint surface and in the joint. These changes include, for example, inflammatory responses characterized by invasion
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Ahmad Nilofer Nina
Ala-Kokko Leena
Baldwin Clinton
Hopkinson Ian
Prockop Darwin J.
Horlick Kenneth R.
Thomas Jefferson University
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