TEST NAME
– William’s Syndrome (FISH)
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ABOUT TEST
– Williams syndrome, also known as Williams-Beuren syndrome, is a rare genetic disorder characterized by growth delays before and after birth (prenatal and postnatal growth retardation), short stature, a varying degree of mental deficiency, and distinctive facial features that typically become more pronounced with age. Williams syndrome may also be associated with heart (cardiac) defects, abnormally increased levels of calcium in the blood during infancy (infantile hypercalcemia), musculoskeletal defects, and/or other abnormalities.
In most individuals with Williams syndrome, the disorder appears to occur spontaneously for unknown reasons (sporadically). However, familial cases have also been reported. Sporadic and familial cases are thought to result from deletion of genetic material from adjacent genes within a specific region of chromosome 7 (7q11.23). 28 genes within the 7q11.23 chromosomal region may play a causative role in Williams syndrome including those known as the ELN (elastin) gene, the LIMK1 (or LIM kinase-1) gene, and the RFC2 (replication factor C, subunit 2) gene. The LIMK1 gene is believed to be involved with visual-spatial problems associated with Williams syndrome.
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GENES TESTED
– 7q11/7q22
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SAMPLE REQUIREMENTS
– Green
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TAT
– 14
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Related Tests
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