Source -- ifopa.org
Saturday, December 13, 2008
Symptoms of FOP
Children with FOP appear normal at birth except for congenital malformations of the great toe. During the first or second decade of life, children form painful fibrous nodules over the neck, back, and shoulders which mature into bone in a process known as heterotopic ossification. FOP then progresses along the trunk and limbs of the body. These lesions slowly replace the body's muscles with normal appearing bone. Any attempt to remove the extra bone results in even more robust bone formation. People who have FOP experience different rates of new bone formation; in some the progress is rapid, while in others it is more gradual. In each case, the exact rate of progression is unpredictable, although there does appear to be a characteristic pattern to the progression. For example, FOP involvement of the upper regions of the body, such as the back and shoulder areas, almost always precedes the development of FOP in the lower portion of the body, i.e. the hips and knees.
Tuesday, August 5, 2008
FOP gene Found
Researchers at the University of Pennsylvania School of Medicine have located the “skeleton key,” a gene that, when damaged, causes the body’s skeletal muscles and soft connective tissue to undergo a metamorphosis into bone, progressively locking joints in place and rendering movement impossible. Identifying the gene that causes fibrodysplasia ossificans progressiva (FOP), one of the rarest and most disabling genetic conditions known to humans and a condition that imprisons its childhood victims in a “second skeleton,” has been the focus at Penn’s Center for Research in FOP and Related Disorders for the past 15 years. This important discovery is relevant, not only for patients with FOP, but also for those with more common skeletal conditions. Senior authors Eileen M. Shore, PhD, and Frederick S. Kaplan, MD, both from the Penn Department of Orthopaedic Surgery, and their international consortium of colleagues, report their findings in the April 23 advanced online edition of Nature Genetics. “The discovery of the FOP gene is relevant to every condition that affects the formation of bone and every condition that affects the formation of the skeleton,” says Kaplan. The discovery of the FOP gene was the result of painstaking work by the Penn scientists and their colleagues in the International FOP Research Consortium over many years. It involved the identification and clinical examination of multigenerational families, often in remote regions of the world; genome-wide linkage analysis; identification of candidate genes; and finally, the DNA sequencing and analysis of those candidate genes. The team found that FOP is caused by a mutation of a gene for a receptor called ACVR1 in the bone morphogenetic protein-signaling pathway. Kaplan describes FOP as the “Mount Everest” of genetic skeletal disorders. His lifelong ambition, as he puts it “is to conquer the summit of this daunting mountain range and see this emerging knowledge turned into novel therapies that can dramatically improve the life of these children. This is nothing less than a campaign for physical independence and personal freedom for these kids. If the knowledge helps us to see farther to help others, that will be great, but this work is for and about the children.”
One in Two Million
FOP is one of the rarest conditions known to medicine, found in only one in 2 million individuals, but, as Kaplan says, quoting from William Harvey who discovered the circulation of the blood, “Nature is nowhere accustomed more openly to display her secret mysteries than in cases where she shows traces of her workings apart from the beaten path.” Of an estimated 2500 total FOP patients worldwide, there are approximately 600 known patients, and the FOP research group at Penn knows nearly all of them. Says Kaplan, “They are our children, our family.”Early in life, because of a possible molecular short-circuit in the wound repair system of the body, tendons, ligaments, and skeletal muscle begin an inexorable transformation into an armament of bone, imprisoning its childhood victims in a second skeleton. “FOP bone is perfectly normal in every way, except it should not be there,” says Kaplan. “There are no other known examples of one normal organ system turning into another. It's like a runaway factory for making bone that just won't stop.”Children with FOP seem normal at birth, except for telltale malformations of the great toes that look like congenital bunions. Early in childhood, painful swellings that are often mistaken for tumors seize the skeletal muscles and transform them into bone. Eventually, ribbons, sheets, and plates of bone cross the joints, lock them in place, and render movement impossible. Attempts to remove the extra bone leads to explosive growth of new bone. Even the slightest trauma such as bumps, bruises, childhood immunizations, and injections for dental work can cause the muscles to turn to bone. For now, there is no effective prevention or treatment for the molecular sabotage of FOP. The discovery of the FOP gene and the unique mutation that causes FOP provides a highly specific target for future drug development that holds promise for altering not just the symptoms of the disease, but the disease itself.
Penn Team Builds on Past Findings
The Penn team originally surmised that FOP was caused by a mutation of a gene in the bone morphogenetic protein (BMP) signaling pathway, one of the most highly conserved signaling pathways in nature. BMPs are regulatory proteins involved in the embryonic formation and post-natal repair of the skeleton.Indeed, the FOP gene encodes a BMP receptor called Activin Receptor Type IA, or ACVR1, one of three known BMP Type I receptors. BMP receptors are protein switches that help determine the fate of the stem cells in which they are expressed. The ACVR1 protein is 509 amino acids long, and in FOP the amino acid histidine is substituted for the amino acid arginine at amino acid position 206 in all affected individuals.FOP is the first human genetic disease ascribed to ACVR1. “Our identification of ACVR1 as a critical regulator of endochondral bone formation during embryogenesis and in post-natal tissues will undoubtedly re-focus thinking and stimulate new research directions,” says Shore. “This discovery will have a major impact on the study of skeletal biology and regenerative medicine.“This single amino acid substitution is predicted to change the sensitivity and activity of the receptor,” continues Shore. “As is the case for most genes, every cell has two copies of the ACVR1 gene. In FOP patients, one of the two ACVR1 gene copies harbors a mutation that causes the ACVR1 protein to be incorrectly made.” In FOP, the ACVR1 gene is damaged by the substitution of a single genetic letter at a specific location in the gene. The single nucleotide substitution changes the meaning of the genetic message encoded by the ACVR1 gene. “Thus, the substitution of one genetic letter for another out of six billion genetic letters in the human genome – the smallest and most precise change imaginable – is like a molecular terrorist that short circuits a functioning set of muscles and connective tissues and transforms them into a second skeleton – in essence turning a light bulb into an atom bomb,” says Kaplan. ACVR1 is an important BMP signaling switch in cartilage cells of the growth plates of growing bones, especially in the hands and feet, as well as in the cells of skeletal muscle. In previous studies in chickens and zebrafish, other researchers have found that an artificially made “trigger happy” copy of the ACVR1 gene (similar, but not identical to the FOP gene mutation) makes muscle cells behave like bone cells, upregulating BMP4 expression; downregulating BMP antagonist expression (such as noggin); expanding cartilage elements in growing bone, eventually inducing extra bone growth; and stimulating joint fusion - clinical and molecular features nearly identical to those seen in individuals with FOP. In the definitive genetic linkage analysis described in the Nature Genetics paper, which located the FOP gene to a region on chromosome 2, the researchers used a subset of families in whom all affected individuals had unambiguous features of classic FOP, features that included typical congenital malformations of the great toes and a predictable pattern of extra-skeletal bone formation that mimics the embryonic patterns by which the normal skeleton forms. The researchers have found that every person with classic FOP has the identical mutation in the ACVR1 gene.
Looking Forward
Computer modeling of the three-dimensional structure of the mutant ACVR1 protein suggests altered activation of this form of ACVR1. “Presumably, the FOP mutation causes a molecular short circuit or promiscuous activation of the receptor, but the detailed molecular physiology is still being deciphered,” says Kaplan. “Such knowledge will be essential to develop treatments and an eventual cure for FOP.”“To really understand the physiological consequences, we have begun to develop a genetically engineered mouse with the FOP mutation,” notes Shore.The ACVR1 gene and protein have been encoded in the molecular machinery of vertebrate DNA for nearly 400 million years – long before the earliest dinosaurs appeared on Earth – suggesting that nature needs to maintain an arginine at codon 206 to support the normal functions of cells, tissues, and organs. Now it will be important to develop an animal model with the same mutation in ACVR1 that is found in people who have FOP. The ACVR1 gene is highly conserved throughout vertebrate evolution, from fish to mice to humans, but whether or not a mouse will develop FOP remains to be seen. “We now know the cause for FOP at the genetic level, and we expect that it will not be long before we understand the mechanism at the molecular level,” says Kaplan. “That knowledge may someday be used, not just for understanding and treating FOP, but for treating many common disorders that affect the skeleton – conditions such as non-genetic forms of extra bone growth that may occur following total hip replacement, head injuries, spinal cord injuries, sports injuries, blast injuries from war, and even osteoarthritis and damaged heart valves. Perhaps someday we will be able to harness the gene mutation that causes the renegade bone formation in FOP and make bone in a controlled way – for patients who have severe osteoporosis, for those with severe bone loss from trauma, for those with fractures that fail to heal or spinal fusions that are slow to heal, or for those with congenital malformations of the spine and limbs. We have reached a summit on our epic journey to understand FOP – knowledge we desperately need to help the kids and that will likely help many others. We still have a long way to go, but finally we can see a therapeutic horizon above the clouds, and the view is promising.” This research was funded by families and friends of FOP patients worldwide; the International FOP Association (http://www.ifopa.org/); and the National Institutes of Health. Co-authors are Meiqi Xu, George J. Feldman, and David A. Fenstermacher, all from Penn; Matthew A. Brown, from the Centre for Immunology and Cancer Research, Princess Alexandria Hospital, Woolloongabba, Queensland, Australia; and the FOP International Research Consortium.
One in Two Million
FOP is one of the rarest conditions known to medicine, found in only one in 2 million individuals, but, as Kaplan says, quoting from William Harvey who discovered the circulation of the blood, “Nature is nowhere accustomed more openly to display her secret mysteries than in cases where she shows traces of her workings apart from the beaten path.” Of an estimated 2500 total FOP patients worldwide, there are approximately 600 known patients, and the FOP research group at Penn knows nearly all of them. Says Kaplan, “They are our children, our family.”Early in life, because of a possible molecular short-circuit in the wound repair system of the body, tendons, ligaments, and skeletal muscle begin an inexorable transformation into an armament of bone, imprisoning its childhood victims in a second skeleton. “FOP bone is perfectly normal in every way, except it should not be there,” says Kaplan. “There are no other known examples of one normal organ system turning into another. It's like a runaway factory for making bone that just won't stop.”Children with FOP seem normal at birth, except for telltale malformations of the great toes that look like congenital bunions. Early in childhood, painful swellings that are often mistaken for tumors seize the skeletal muscles and transform them into bone. Eventually, ribbons, sheets, and plates of bone cross the joints, lock them in place, and render movement impossible. Attempts to remove the extra bone leads to explosive growth of new bone. Even the slightest trauma such as bumps, bruises, childhood immunizations, and injections for dental work can cause the muscles to turn to bone. For now, there is no effective prevention or treatment for the molecular sabotage of FOP. The discovery of the FOP gene and the unique mutation that causes FOP provides a highly specific target for future drug development that holds promise for altering not just the symptoms of the disease, but the disease itself.
Penn Team Builds on Past Findings
The Penn team originally surmised that FOP was caused by a mutation of a gene in the bone morphogenetic protein (BMP) signaling pathway, one of the most highly conserved signaling pathways in nature. BMPs are regulatory proteins involved in the embryonic formation and post-natal repair of the skeleton.Indeed, the FOP gene encodes a BMP receptor called Activin Receptor Type IA, or ACVR1, one of three known BMP Type I receptors. BMP receptors are protein switches that help determine the fate of the stem cells in which they are expressed. The ACVR1 protein is 509 amino acids long, and in FOP the amino acid histidine is substituted for the amino acid arginine at amino acid position 206 in all affected individuals.FOP is the first human genetic disease ascribed to ACVR1. “Our identification of ACVR1 as a critical regulator of endochondral bone formation during embryogenesis and in post-natal tissues will undoubtedly re-focus thinking and stimulate new research directions,” says Shore. “This discovery will have a major impact on the study of skeletal biology and regenerative medicine.“This single amino acid substitution is predicted to change the sensitivity and activity of the receptor,” continues Shore. “As is the case for most genes, every cell has two copies of the ACVR1 gene. In FOP patients, one of the two ACVR1 gene copies harbors a mutation that causes the ACVR1 protein to be incorrectly made.” In FOP, the ACVR1 gene is damaged by the substitution of a single genetic letter at a specific location in the gene. The single nucleotide substitution changes the meaning of the genetic message encoded by the ACVR1 gene. “Thus, the substitution of one genetic letter for another out of six billion genetic letters in the human genome – the smallest and most precise change imaginable – is like a molecular terrorist that short circuits a functioning set of muscles and connective tissues and transforms them into a second skeleton – in essence turning a light bulb into an atom bomb,” says Kaplan. ACVR1 is an important BMP signaling switch in cartilage cells of the growth plates of growing bones, especially in the hands and feet, as well as in the cells of skeletal muscle. In previous studies in chickens and zebrafish, other researchers have found that an artificially made “trigger happy” copy of the ACVR1 gene (similar, but not identical to the FOP gene mutation) makes muscle cells behave like bone cells, upregulating BMP4 expression; downregulating BMP antagonist expression (such as noggin); expanding cartilage elements in growing bone, eventually inducing extra bone growth; and stimulating joint fusion - clinical and molecular features nearly identical to those seen in individuals with FOP. In the definitive genetic linkage analysis described in the Nature Genetics paper, which located the FOP gene to a region on chromosome 2, the researchers used a subset of families in whom all affected individuals had unambiguous features of classic FOP, features that included typical congenital malformations of the great toes and a predictable pattern of extra-skeletal bone formation that mimics the embryonic patterns by which the normal skeleton forms. The researchers have found that every person with classic FOP has the identical mutation in the ACVR1 gene.
Looking Forward
Computer modeling of the three-dimensional structure of the mutant ACVR1 protein suggests altered activation of this form of ACVR1. “Presumably, the FOP mutation causes a molecular short circuit or promiscuous activation of the receptor, but the detailed molecular physiology is still being deciphered,” says Kaplan. “Such knowledge will be essential to develop treatments and an eventual cure for FOP.”“To really understand the physiological consequences, we have begun to develop a genetically engineered mouse with the FOP mutation,” notes Shore.The ACVR1 gene and protein have been encoded in the molecular machinery of vertebrate DNA for nearly 400 million years – long before the earliest dinosaurs appeared on Earth – suggesting that nature needs to maintain an arginine at codon 206 to support the normal functions of cells, tissues, and organs. Now it will be important to develop an animal model with the same mutation in ACVR1 that is found in people who have FOP. The ACVR1 gene is highly conserved throughout vertebrate evolution, from fish to mice to humans, but whether or not a mouse will develop FOP remains to be seen. “We now know the cause for FOP at the genetic level, and we expect that it will not be long before we understand the mechanism at the molecular level,” says Kaplan. “That knowledge may someday be used, not just for understanding and treating FOP, but for treating many common disorders that affect the skeleton – conditions such as non-genetic forms of extra bone growth that may occur following total hip replacement, head injuries, spinal cord injuries, sports injuries, blast injuries from war, and even osteoarthritis and damaged heart valves. Perhaps someday we will be able to harness the gene mutation that causes the renegade bone formation in FOP and make bone in a controlled way – for patients who have severe osteoporosis, for those with severe bone loss from trauma, for those with fractures that fail to heal or spinal fusions that are slow to heal, or for those with congenital malformations of the spine and limbs. We have reached a summit on our epic journey to understand FOP – knowledge we desperately need to help the kids and that will likely help many others. We still have a long way to go, but finally we can see a therapeutic horizon above the clouds, and the view is promising.” This research was funded by families and friends of FOP patients worldwide; the International FOP Association (http://www.ifopa.org/); and the National Institutes of Health. Co-authors are Meiqi Xu, George J. Feldman, and David A. Fenstermacher, all from Penn; Matthew A. Brown, from the Centre for Immunology and Cancer Research, Princess Alexandria Hospital, Woolloongabba, Queensland, Australia; and the FOP International Research Consortium.
Saturday, August 2, 2008
Me & FOP
I am N. Lakshmi & I am from Faridabad. I have been diagnosed as Fibrodysplasia Ossificans Progressiva - [FOP] Patient by a child specialist (Pediatrics) when I was just 5 years old.
I was told by birth I had a deformity in toe. At the age of 5, a sudden spontaneous swelling of muscles having no pain was noticed. This swelling at the right side of my neck was continued to enlarge in size, which gradually turned into stiffened cord like structure suspending the neck movement.
When I was 12 years old, I was unable to board the bus as I was feeling discomfort / pain in the lower leg. However I used to bend upon and use my knees to board the bus. From the age of 14, I was unable to use school bus, as one of my leg was partially bent and I used to stand by walker only.
After completion of my school education, I had completed Graduation in B.Com from Delhi University. I had also done Diploma in Computer Application, I had also done PGDCA i.e. Post Graduate Diploma in Computer Applications. Underwent Capital Market – “SMART INVESTOR” course conducted by The Institute of Computer Accountants, Faridabad.
From Nov, 08, my left arm is also frozen. Now I am unable to walk with the help of walker. Now I have become totally wheel chair bound. I am unable to stand, walk & finding very difficulties in daily chores.
I was told by birth I had a deformity in toe. At the age of 5, a sudden spontaneous swelling of muscles having no pain was noticed. This swelling at the right side of my neck was continued to enlarge in size, which gradually turned into stiffened cord like structure suspending the neck movement.
When I was 12 years old, I was unable to board the bus as I was feeling discomfort / pain in the lower leg. However I used to bend upon and use my knees to board the bus. From the age of 14, I was unable to use school bus, as one of my leg was partially bent and I used to stand by walker only.
After completion of my school education, I had completed Graduation in B.Com from Delhi University. I had also done Diploma in Computer Application, I had also done PGDCA i.e. Post Graduate Diploma in Computer Applications. Underwent Capital Market – “SMART INVESTOR” course conducted by The Institute of Computer Accountants, Faridabad.
Till the age of 14, I was walking properly without any support, but now my left leg is frozen & bent & I walk with one leg only with the help of walker & roam around with the help of wheelchair.
From Nov, 08, my left arm is also frozen. Now I am unable to walk with the help of walker. Now I have become totally wheel chair bound. I am unable to stand, walk & finding very difficulties in daily chores.
FOP
Fibrodysplasia Ossificans Progressiva (FOP) is an extremely rare disease in which the body inappropriately makes extra bone in locations where it should not: in muscles, tendons, ligaments, and other connective tissues. It is a progressive disease in which the body essentially becomes locked inside of an extra skeleton. Yet this progression is not random in its appearance. Though FOP affects all patients differently -- at different times, to different degrees, and with different effects -- clear patterns emerge. Namely, FOP usually affects patients in the following manner: its development is axial to appendicular (meaning that the neck, spine, and shoulders will be affected before elbows, hips, and knees). Development is also cranial to caudal (meaning that the shoulders and elbows will be affected before the hips and knees). Finally, progression is proximal to distal. In other words, shoulders are affected before elbows and wrists, while hips are affected before knees and ankles.
At the present time, no known prevention exists for FOP. The unknown genetic mutation that leads to FOP occurs spontaneously either in the egg or sperm cell prior to fertilization or just after fertilization in the very early embryo. At present, there is no way to detect these early changes and no known direct cause for their occurrence. Most changes in DNA occur spontaneously without any known cause and have no obvious effect. Some can be beneficial while others can lead to the development of disorders like FOP.
FOP affects the neck, spine, chest, shoulders, elbows, wrists, hips, knees, ankles, jaw, and many areas in between. The progression of ossification follows a characteristic pattern. Usually extra bone forms in the neck, spine, and shoulders before developing in the elbows, hips, and knees. The muscles of the diaphragm, tongue, eyes, face, and heart are characteristically spared.The well-documented and characteristic progression of FOP, as well as the regions not affected, likely hold important clues to the cause and development of the disease.
FOP affects mobility because the body's joints, such as the knees or the elbows, connect the bones and aid in movement. In FOP, extra bone replaces the ligaments (which cover the joints), as well as muscles and tendons (which move the joints). Consequently, movement in areas affected by FOP becomes difficult or impossible.
At the present time, no known prevention exists for FOP. The unknown genetic mutation that leads to FOP occurs spontaneously either in the egg or sperm cell prior to fertilization or just after fertilization in the very early embryo. At present, there is no way to detect these early changes and no known direct cause for their occurrence. Most changes in DNA occur spontaneously without any known cause and have no obvious effect. Some can be beneficial while others can lead to the development of disorders like FOP.
FOP affects the neck, spine, chest, shoulders, elbows, wrists, hips, knees, ankles, jaw, and many areas in between. The progression of ossification follows a characteristic pattern. Usually extra bone forms in the neck, spine, and shoulders before developing in the elbows, hips, and knees. The muscles of the diaphragm, tongue, eyes, face, and heart are characteristically spared.The well-documented and characteristic progression of FOP, as well as the regions not affected, likely hold important clues to the cause and development of the disease.
FOP affects mobility because the body's joints, such as the knees or the elbows, connect the bones and aid in movement. In FOP, extra bone replaces the ligaments (which cover the joints), as well as muscles and tendons (which move the joints). Consequently, movement in areas affected by FOP becomes difficult or impossible.
Source -- ifopa.org
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