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Early intervention is important in ensuring that children with cri du chat syndrome reach their highest potential. As affected infants age the face may lose its plumpness and become abnormally long and narrow. The disorder was first described in the medical literature in by doctor Lejeune who named the disorder after the distinctive cat-like cry. Scientific techniques in determining chromosomal abnormalities are becoming more and more refined. The ed bands specify the location of the thousands of genes that are present on each chromosome.

Affected children also exhibit delays in the acquisition of skills requiring the coordination of muscular and mental activities psychomotor disability and moderate to severe intellectual disability. Additional facial features include an abnormally small distance from the upper lip to the nose short philtrumincomplete closure of the roof of the mouth cleft palatean abnormal groove or gap in the upper lip cleft lipand abnormal fullness of the lower lip.

Less commonly, it may appear to result from a balanced translocation in one of the parents. Common symptoms include a distinctive cry that resembles the mewing of a cat, characteristic facial features, slow growth, and microcephaly, a condition that indicates that head circumference is smaller than would be expected for an infant's age and sex.

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Symptoms vary greatly from case to case depending upon the exact size and location of the deleted genetic material. Chromosomes, which are present in the nucleus of human cells, carry the genetic information for each individual. Chromosomes are further sub-divided into many bands that are ed. Most cases of cri du chat syndrome appear to occur spontaneously de novo for unknown reasons very early in embryonic development.

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The characteristic high-pitched, shrill cry associated with cri du chat syndrome is present during the first few weeks of life. About half of children with cri du chat syndrome were able to dress themselves by age 5 years. Some individuals may develop repeated respiratory and intestinal infections. Speech development is especially delayed in children with cri du chat syndrome. Chromosomal studies may also be performed to determine whether a balanced translocation is present in one parent. Symptoms of the following disorders can be similar to those of cri du chat syndrome.

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Most affected infants and children also have distinctive malformations of the skull and facial craniofacial region. Pairs of human chromosomes are ed from 1 through 22, and an additional 23rd pair of sex chromosomes which include one X and one Y chromosome in males and two X chromosomes in females. Treatment may require the coordinated efforts of a team of specialists. In the same study half the children over ten who had undergone special schooling and lived in a supportive home environment, were able to communicate adequately.

Although the size and location of the 4p deletion vary from case to case, it is believed that deletion of band 4p Associated abnormalities typically include a low birth weight, growth retardation, poor muscle tone hypotoniaand delays in the discussion of skills requiring the coordination of physical and mental activities psychomotor retardation. Some children may display hyperactivity or self-abusive behaviors. Genetic counseling is recommended for affected individuals and their families. Philadelphia, PA. Churchill Livingstone. Less common findings associated with cri du chat syndrome include the development of a tear in the supportive tissue of the lower abdomen inguinal hernia allowing a portion of the intestines to protrude out; the passage or flowing back reflux of the contents of the stomach or small intestines duodenum into the esophagus gastroesophageal reflux ; abnormalities of the kidney and urinary tract; respiratory chats webbing of the fingers and toes syndactyly ; abnormal bending or curving of the pinkies inward toward the fourth finger clinodactyly ; clubfeet; and structural anomalies of the voice box larynx.

A specific test known as fluorescence in situ hybridization FISH may be used to confirm a diagnosis of cri du chat syndrome. A general translocation consists of an altered but balanced set of chromosomes and is usually harmless to the carrier. The survival for children with cri du chat is generally good. Most syndrome related deaths occur within the first year of life. Jones KL. Most affected infants also display some degree of psychomotor and intellectual disability. Additional the abnormalities may also be present.

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Affected infants may have feeding difficulties due to low muscle tone, poor suck, and gastroesophageal reflux disease. One study has shown that early special schooling, a home environment rather than an institutional oneand family support may help the patient achieve the abilities of a normal five or six year old.

Wolf-Hirschhorn syndrome usually appears to occur spontaneously de novo for unknown reasons very early in embryonic development. Some cases of cri du chat syndrome may go undiagnosed making it difficult to determine the true frequency of this disorder in the general population.

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The incidence ranges fromto 50, live births. New York, NY; Syndromes of the Head and Neck. In newborns, the diagnosis of cri du chat syndrome is confirmed by a thorough clinical evaluation, identification of characteristic findings e. Surgery may be performed to treat a variety of symptoms potentially associated with cri du chat syndrome including congenital heart defects, strabismus, scoliosis, clubfoot, cleft palate and cleft lip. Translocations occur when regions of certain chromosomes break off and are rearranged, resulting in shifting of genetic material and an altered set of chromosomes.

Cri du chat syndrome CdCS or 5p- is a rare genetic disorder in which a variable portion of the short arm of chromosome 5 is missing or deleted monosomic. This means diagnostic techniques have improved and in certain instances prenatal diagnosis of cri du chat syndrome is possible.

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Most cases are thought arise from spontaneous de novo genetic errors very early in embryonic development. Cri-du-Chat Syndrome. A variety of additional findings may occur in association with cri du chat syndrome. Psychomotor disability is a delay in the acquisition of skills requiring mental and muscular activities such head control, sitting up, and walking. The symptoms of cri du chat syndrome vary from case to case. In individuals with cri du chat syndrome, the range and severity of associated symptoms and findings can vary, depending upon the exact length or location of the deleted portion of chromosome 5p.

Chromosomal testing is necessary to confirm the specific chromosomal abnormality present. Prematurely graying of the hair has also been reported.

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The symptoms affecting different organ systems of the body can also occur. Cri du chat syndrome is a chromosomal disorder caused by a partial deletion monosomy of a varying length of the short arm p of chromosome 5. Treatment The treatment of cri du chat syndrome is directed toward the specific symptoms that are general in each individual. Affected children usually understand speech better than they can communicate. In approximately percent of cases, cri du chat syndrome may result from a balanced translocation involving chromosome 5p and another chromosome or chromosomes.

Most children are enrolled in therapy before one year of age. The cry, which resembles the mewing of a cat, becomes less pronounced as affected infants grow older. While children with cri du chat syndrome are born hypotonic low muscle tonethey tend to become hypertonic high muscle tone as they grow older.

Cri du chat syndrome affects females more often than males. Chromosomal analysis may determine whether a parent has a balanced translocation. Other treatment is symptomatic and supportive. Affected children also have a higher risk of ear infections and hearing loss. Approximately percent of affected infants have congenital discussion defects. As some children with cri du chat can have sensory-neural deafness, auditory testing should be performed.

In affected male infants, the testes may fail to descend into the scrotum cryptorchidism and the urinary opening may be located on the underside of the penis hypospadias. Wolf-Hirschhorn syndrome, also known as Wolf chat, is a rare chromosomal disorder in which there is partial deletion monosomy of the short arm p of chromosome 4 4p. Information on current clinical trials is posted on the Internet at www.

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Several children have lived to be over 50 years of age. Researchers have determined that certain symptoms may be associated with specific regions on the short arm of chromosome 5. Some are also at risk for aspiration which can lead to pneumonias. Abnormal side-to-side curvature of the spine scoliosis is a frequent complication.

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Additional diagnostic tests may be used to determine the extent of the disorder such as x-rays to reveal skeletal abnormalities such as scoliosis. In addition, the fleshy mass uvula that hangs in the back of the throat may be spilt bifid uvula.

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Researchers have identified several genes that are believed to play a role in the development of cri du chat syndrome. Such translocations may occur spontaneously for unknown reasons de novo or be transmitted by a parent who is a carrier of such a balanced translocation.

The most common heart defect is patent ductus arteriosus, a condition in which the passage ductus between the blood vessel that le to the lungs pulmonary artery and the major artery of the body aorta fails to close after birth. The telomerase reverse transcriptase gene that is located on the short arm of chromosome 5 at band The deletion of the d-catenin gene, also at 5p If researchers can link specific sets of symptoms and findings phenotypes to specific deletion of chromosome 5p, it may greatly aid in diagnosis and prognosis.

Moderate to severe intellectual disability is present in most cases. Comparisons may be useful for a differential diagnosis. Research and studies of cri du chat syndrome are ongoing.

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Additional chromosomal disorders may have features similar to those associated with cri du chat syndrome. Improper alignment of the upper and lower teeth malocclusion may also occur. In some cases, nearsightedness myopia and cataracts may develop.