Hi everyone. We got Sonya's DNA test results in today. I'm very shocked to say the least. Her geneticists have found her to have a Osteogenesis Imperfecta with type 1 collagen deficit. They haven't pinpointed which type just yet. There are 4 types of OI that involve type 1 collagen mutations that she will be tested for. The other 4 types of OI do not involve type 1 collagen deficits. Her geneticists know of one other patient with the same gene mutation as Sonya's and that person has type 3 OI, one of the most severe types. They can not say definitively if this is the case for Sonya without further testing. I am worried to say the least, over her new found diagnosis. So far though she is proving to be a very strong and delightful little girl. We have our next visit with our geneticists at Children's Hospital of Philadelphia on February 18th and we have our next appointment with Dr. Ain and our new geneticist (for a second opinion) Dr. Julie Hoover Fong on May 15th.
Here is some information that I have found on the OI Foundation website describing the 4 types of OI that Sonya may have:
Type I
~OI Type I is the mildest and most common form of the disorder. It accounts for 50 percent of the total OI population.
~Type I is characterized with mild bone fragility, relatively few fractures, and minimal limb deformities. The child might not fracture until he or she is learning to walk.
~Shoulders and elbow dislocations may occur more frequently than in healthy children.
~Some children have few obvious signs of OI or fractures. Others experience multiple fractures of the long bones, compression fractures of the vertebrae, and chronic pain.The intervals between fractures may vary considerably.
~After growth is completed, the incidence of fractures decreases considerably.
~Blue sclera are often present.
~Typically, a child’s stature may be average or slightly shorter-than-average as compared with unaffected family members, but is still within the normal range for the age.
~There is a high incidence of hearing loss. Onset occurs primarily in young adulthood, but it may occur in early childhood.
~Dentinogenesis imperfecta is often absent.
~OI Type I is dominantly inherited. It can be inherited from an affected parent, or, in previously unaffected families, it results from a spontaneous mutation. Spontaneous mutations are common.
~Biochemical tests on cultured skin fibroblasts show a lower-than-normal amount of type I collagen. Collagen structure is normal.
~People with OI Type I experience the psychological burden of appearing normal and healthy to the casual observer despite needing to accommodate their bone fragility.
~The absence of obvious symptoms in some children may contribute to problems at school or with peers.
~Significant care issues that arise with OI Type I include gross motor developmental delays, joint and ligament weakness and instability, muscle weakness, the need to prevent fracture cycles, and the necessity of spine protection.
~Family members should carry documentation of the OI diagnosis to avoid accusations of child abuse at emergency rooms.
~Treatment with bisphosphonates is not routinely recommended.
~The treatment plan should maximize mobility and function, increase peak bone mass, and develop muscle strength. Physical therapy, early intervention programs, and as much exercise and physical activity as possible will improve outcomes.
Type II:
~OI Type II is the most severe form.
~At birth, infants with OI Type II have very short limbs, small chests, and soft skulls. Their legs are often in a frog-leg position.
~The radiologic features are characteristic and include absent or limited calvarial mineralization; flat vertebral bodies; very short, telescoped, broad femurs; beaded and often broad short ribs; and evidence of malformation of the long bones.
~Intrauterine fractures will be evident in the skull, long bones, or vertebrae.
~The sclera are usually very dark blue or gray.
~The lungs are underdeveloped.
~Infants with OI Type II have low birth weights.
~Respiratory and swallowing problems are common.
~Macrocephaly may be present. Microcephaly is rarely present.
~Infants with OI Type II usually die within weeks of delivery. A few may survive longer. Cause of death is usually respiratory and cardiac complications.
~OI Type II results from a new dominant mutation in a type 1 collagen gene or parental mosaicism. Similar extremely severe types of OI, Types VII and VIII, can be caused by recessive mutations to other genes.
~Genetic counseling is recommended for parents of a child with OI Type II before any future pregnancies.
~Significant care issues that arise with OI Type II include obtaining an accurate diagnosis, getting genetic counseling, the family’s need for emotional support, and management of respiratory and cardiac impairments. Infants with OI Type II who can breathe without a respirator and those with severe OI Type III may be candidates for off-label treatment with bisphosphonates. At this time, pamidronate (©Aredia) is the only bisphosphonate that has been studied in infants who have OI. Treatment research is ongoing.
Type III:
~OI Type III is the most severe type among children who survive the neonatal period. The degree of bone fragility and the fracture rate vary widely.
~This type is characterized by structurally defective type I collagen. This poor quality type I collagen is present in reduced amounts in the bone matrix.
~At birth, infants generally have mildly shortened and bowed limbs, small chests, and a soft calvarium.
~Respiratory and swallowing problems are common in newborns.
~There may be multiple long-bone fractures at birth, including many rib fractures.
~Frequent fractures of the long bones, the tension of muscle on soft bone, and the disruption of the growth plates lead to bowing and progressive malformation. Children have a markedly short stature, and adults are usually shorter than 3 feet, 6 inches, or 102 centimeters.
~Spine curvatures, compression fractures of the vertebrae, scoliosis, and chest deformities occur frequently.
~The altered structure of the growth plates gives a popcorn-like appearance to the metaphyses and epiphyses.
~The head is often large relative to body size.
~A triangular facial shape, due to over development of the head and underdevelopment of the face bones, is characteristic.
~The sclera may be white or tinted blue, purple, or gray.
~Dentinogenesis imperfecta is common but not universal.
~The majority of OI Type III cases result from dominant mutations in type I collagen genes. Often these mutations are spontaneous. Similar extremely severe types of OI, Types VII and VIII, are caused by recessive mutations to other genes.
~Genetic counseling is recommended for asymptomatic parents of a child with OI Type III before any future pregnancies.
~Significant care issues that arise with OI Type III include the need to prevent fracture cycles; the appropriate timing of rodding surgery; scoliosis monitoring; respiratory function monitoring; the need to develop strategies to cope with short stature and fatigue; the family’s need for emotional support, especially during infancy; and the off-label use of bisphosphonates.
~It is also important to address difficulties with social integration, participation in leisure activities, and maintaining stamina.
~The treatment plan should maximize mobility and function, increase peak bone mass and muscle strength, and employ as much exercise and physical activity as possible.
Type IV:
~People with OI Type IV are moderately affected. Type IV can range in severity from relatively few fractures, as in OI Type I, to a more severe form resembling OI Type III.
~The diagnosis can be made at birth but often occurs later.
~The child might not fracture until he or she is walking.
~People with OI Type IV have moderate-to-severe growth retardation, which is one factor that distinguishes them clinically from people with Type I.
~Bowing of the long bones is common, but to a lesser extent than in Type III.
~The sclera are often light blue in infancy, but the color intensity varies. The sclera may lighten to white later in childhood or early adulthood.
~The child’s height may be less-than-average for his or her age.
~It is common for the humerus and femur to be short
~Long bone fractures, vertebral compression, scoliosis, and ligament laxity may also be present.
Dentinogenesis imperfecta may be present or absent.
~OI Type IV has an autosomal dominant pattern of inheritance. Many cases are the result of a new mutation.
~This type is characterized by structurally defective type I collagen. This poor quality type I collagen is present in reduced amounts in the bone matrix.
~Significant care issues that arise with OI Type IV include the need to prevent fracture cycles; the appropriate timing of rodding surgery; scoliosis monitoring; the need to develop strategies for coping with short stature and fatigue; the family’s need for emotional support, especially during infancy; and the off-label use of bisphosphonates. Family members should carry documentation of the OI diagnosis to avoid accusations of child abuse at emergency rooms.
~It is also important to address difficulties with social integration, participation in leisure activities, and maintaining stamina.
~The treatment plan should maximize mobility and function, increase peak bone mass and muscle strength, and employ as much exercise and physical activity as possible.
It is my opinion that Sonya has either type 3 or 4 based on these facts:
1. People with type 1 OI are of average stature and their collagen structure is normal. ~ Sonya is only in the 3rd percentile for growth and has abnormal collagen structure.
2. Type 2 OI babies are born with a low birth weight and in utero have evident fractures in the skull, long bones or vertebrae. ~ Sonya was a whopping 8 lbs 5 oz at birth and during all 7 of my ultrasounds not a single broken bone was found and they were LOOKING for one!
I hate to try and guess what her type will be, but it is my nature to research it like crazy until I can take no more! A whole year and 10 days now is a long time to wait in the unknown. Jenn, I know you can back me up on that as you are still waiting on Simon's diagnosis as well. It can drive you crazy! So now I sit here with one bit of a diagnosis, still feeling as though we haven't come far enough and not much closer. I wasn't expecting these results at all. Campomelic Dysplasia or inconclusive results sure, but now as I hold her I'm scared. I think I liked not knowing a little bit better. A very big thank you to all of my great friends here in the blogging community, POLP. Campomelic Families, SWAN, OI Children, and of course Facebook and Myspace (yeah, I spend a ton of time on the net.. hehe..) for all of your excellent support! You guys are the best truely!
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