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fra(X) syndrome; FRAXA; FRAXA Syndrome; FXS; Marker X syndrome; Martin-Bell Syndrome; X-linked mental retardation and ma... 

5p Deletion Syndrome; 5p- Syndrome; Cat cry syndrome 

Fragile X syndrome (also called Fragile X) is the most common inherited form of mental retardation. It results from a change, or mutation, in a single gene, which can be passed from one generation to the next. Fragile X appears in families of every ethnic group and income level. Symptoms of Fragile X syndrome occur because the mutated gene cannot produce enough of a protein that is needed by the body’s cells, especially cells in the brain, to develop and function normally. The amount and usab...

Cri-du-chat (cat cry) syndrome is a chromosomal condition that results when a piece of chromosome 5 is missing. Infants with the condition often have a high-pitched cry that sounds like that of a cat. The disorder is characterized by severe mental retardation and delayed development, distinctive facial features, small head size (microcephaly), low birth weight, and weak muscle tone (hypotonia) in infancy.


Fragile X Syndrome as related to Cri-du-chat syndrome