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Spondylocarpotarsal synostosis syndrome
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Reviewed September 2011
What is spondylocarpotarsal synostosis syndrome?
Spondylocarpotarsal synostosis syndrome is a disorder that affects the development of bones throughout the body. Newborns with this disorder are of approximately normal length, but impaired growth of the trunk results in short stature over time. The bones of the spine (vertebrae) are misshapen and abnormally joined together (fused). The vertebral abnormalities may result in an abnormally curved lower back (lordosis) and a spine that curves to the side (scoliosis).
Affected individuals also have abnormalities of the wrist (carpal) and ankle (tarsal) bones and inward- and upward-turning feet (clubfeet). Characteristic facial features include a round face, a large forehead (frontal bossing), and nostrils that open to the front rather than downward (anteverted nares).
Some people with spondylocarpotarsal synostosis syndrome have an opening in the roof of the mouth (a cleft palate), hearing loss, thin tooth enamel, flat feet, or an unusually large range of joint movement (hypermobility). Individuals with this disorder can survive into adulthood. Intelligence is generally unaffected, although mild developmental delay has been reported in some affected individuals.
How common is spondylocarpotarsal synostosis syndrome?
Spondylocarpotarsal synostosis syndrome is a rare disorder; its prevalence is unknown. At least 25 affected individuals have been identified.
What genes are related to spondylocarpotarsal synostosis syndrome?
Mutations in the FLNB gene cause spondylocarpotarsal synostosis syndrome. The FLNB gene provides instructions for making a protein called filamin B. This protein helps build the network of protein filaments (cytoskeleton) that gives structure to cells and allows them to change shape and move. Filamin B attaches (binds) to another protein called actin and helps the actin to form the branching network of filaments that makes up the cytoskeleton. It also links actin to many other proteins to perform various functions within the cell, including the cell signaling that helps determine how the cytoskeleton will change as tissues grow and take shape during development.
Filamin B is especially important in the development of the skeleton before birth. It is active (expressed) in the cell membranes of cartilage-forming cells (chondrocytes). Cartilage is a tough, flexible tissue that makes up much of the skeleton during early development. Most cartilage is later converted to bone (a process called ossification), except for the cartilage that continues to cover and protect the ends of bones and is present in the nose, airways (trachea and bronchi), and external ears. Filamin B appears to be important for normal cell growth and division (proliferation) and maturation (differentiation) of chondrocytes and for the ossification of cartilage.
FLNB gene mutations that cause spondylocarpotarsal synostosis syndrome result in the production of an abnormally short filamin B protein that is unstable and breaks down rapidly. Loss of the filamin B protein appears to result in out-of-place (ectopic) ossification, resulting in fusion of the bones in the spine, wrists, and ankles and other signs and symptoms of spondylocarpotarsal synostosis syndrome.
A few individuals who have been diagnosed with spondylocarpotarsal synostosis syndrome do not have mutations in the FLNB gene. In these cases, the genetic cause of the disorder is unknown.
Read more about the FLNB gene.
How do people inherit spondylocarpotarsal synostosis syndrome?
Spondylocarpotarsal synostosis syndrome caused by FLNB gene mutations is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.
In a few individuals with signs and symptoms similar to those of spondylocarpotarsal synostosis syndrome but without FLNB gene mutations, the condition appears to have been inherited in an autosomal dominant pattern. Autosomal dominant means one copy of the altered gene in each cell is sufficient to cause the disorder.
Where can I find information about diagnosis or management of spondylocarpotarsal synostosis syndrome?
These resources address the diagnosis or management of spondylocarpotarsal synostosis syndrome and may include treatment providers.
General information about the diagnosis and management of genetic conditions is available in the Handbook. Read more about genetic testing, particularly the difference between clinical tests and research tests.
To locate a healthcare provider, see How can I find a genetics professional in my area? in the Handbook.
Where can I find additional information about spondylocarpotarsal synostosis syndrome?
You may find the following resources about spondylocarpotarsal synostosis syndrome helpful. These materials are written for the general public.
You may also be interested in these resources, which are designed for healthcare professionals and researchers.
What other names do people use for spondylocarpotarsal synostosis syndrome?
What if I still have specific questions about spondylocarpotarsal synostosis syndrome?
Where can I find general information about genetic conditions?
The Handbook provides basic information about genetics in clear language.
These links provide additional genetics resources that may be useful.
What glossary definitions help with understanding spondylocarpotarsal synostosis syndrome?
actin ; autosomal ; autosomal dominant ; autosomal recessive ; bronchi ; cartilage ; cell ; cleft palate ; congenital ; cytoskeleton ; developmental delay ; differentiation ; ectopic ; enamel ; expressed ; gene ; hypermobility ; joint ; lordosis ; ossification ; palate ; prevalence ; proliferation ; protein ; recessive ; scoliosis ; short stature ; stature ; syndrome ; tissue ; unilateral
You may find definitions for these and many other terms in the Genetics Home Reference Glossary.
See also Understanding Medical Terminology.
References (3 links)
The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? in the Handbook.