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Shprintzen syndrome

22q11.2 deletion syndrome (also called DiGeorge syndrome and velocardiofacial syndrome) is a disorder caused by the deletion of a small piece of chromosome 22. The deletion occurs near the middle of the chromosome at a location designated q11.2. more...

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The features of this syndrome vary widely, even among members of the same family, and affect many parts of the body. Characteristic signs and symptoms include heart defects that are often present from birth, an opening in the roof of the mouth (a cleft palate or other defect in the palate), learning disabilities, recurrent infections caused by problems with the immune system, and mild differences in facial features. Affected individuals may also have kidney abnormalities, low levels of calcium in the blood (which can result in seizures), significant feeding difficulties, autoimmune disorders such as rheumatoid arthritis, and an increased risk of developing mental illnesses such as schizophrenia and bipolar disorder.

Because the signs and symptoms of 22q11.2 deletion syndrome are so varied, different groupings of features were once described as separate conditions. Doctors named these conditions DiGeorge syndrome, velocardiofacial syndrome (also called Shprintzen syndrome), and conotruncal anomaly face syndrome. In addition, some children with the 22q11.2 deletion were diagnosed with Opitz G/BBB syndrome and Cayler cardiofacial syndrome. Once the genetic basis for these disorders was identified, doctors determined that they were all part of a single syndrome with many possible signs and symptoms. To avoid confusion, this condition is usually called 22q11.2 deletion syndrome, a description based on its underlying genetic cause.

Symptoms

Individuals with a 22q11 deletion have a range of findings, including:

  • Congenital heart disease (74% of individuals), particularly conotruncal malformations (tetralogy of Fallot, interrupted aortic arch, ventricular septal defect, and truncus arteriosus)
  • palatal abnormalities (69%), particularly velopharyngeal incompetence (VPI), submucosal cleft palate, and cleft palate; characteristic facial features (present in the majority of Caucasian individuals)
  • learning difficulties (70-90%)
  • an immune deficiency regardless of their clinical presentation (77%)
  • hypocalcemia (50%)
  • significant feeding problems (30%)
  • renal anomalies (37%)
  • hearing loss (both conductive and sensorineural)
  • laryngotracheoesophageal anomalies
  • growth hormone deficiency
  • autoimmune disorders
  • seizures (without hypocalcemia)
  • skeletal abnormalities

Thymus, parathyroid glands and heart derive from the same primitive embryonic structure and that is why these three organs are dysfunctioned together in this disease. Affected patients (usually children) are prone to yeast infections.

Cause

The disease is related with genetic deletions (loss of a small part of the genetic material) found on the long arm of the 22nd chromosome. Some patients with similar clinical features may have deletions on the short arm of chromosome 10.

Read more at Wikipedia.org


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Manic depression linked to absent DNA - bipolar disorder
From Science News, 1/4/97 by Bruce Bower

To their surprise, researchers have found that a severe form of manic depression, usually beginning by late childhood, afflicts many people suffering from a genetic disorder known as velo-cardio-facial syndrome (VCFS). Further investigations of this formerly unsuspected connection may yield insight into genetic influences on manic depression, according to the investigators.

"This is the first reported link between these two conditions," says Demitri F. Papolos, a psychiatrist at the Albert Einstein College of Medicine of Yeshiva University in New York, who directed the new study. "The deletion of one or more genes in velo-cardio-facial syndrome may help to create a vulnerability to [manic depression]."

Primary features of VCFS consist of cleft palate, heart defects, learning disabilities, and a characteristic facial appearance that includes a long face, a large nose with a prominent tip, small ears, narrow eyes, and an emotionless expression. Robert J. Shprintzen, director of the Center for Craniofacial Disorders at Montefiore Medical Center in New York and a coauthor of the new study, defined this set of characteristics as VCFS in 1976. He estimates that it affects between 1 in 3,000 and 1 in 5,000 individuals.

Prior molecular investigations indicated that VCFS stems from the deletion of a specific segment of chromosome 22, Papolos notes. Between 25 and 30 genes, several of which have been identified, lie in that stretch of DNA.

The new study, described in the December American Journal of Psychiatry, included psychiatric evaluations and reviews of medical records for 25 people diagnosed with VCFS. Their ages ranged from 5 to 34 years.

Nearly two-thirds of the sample suffered from manic depression, also known as bipolar disorder, the researchers found. This condition typically features alternating bouts of euphoric agitation and severe depression that last several weeks or months. Some people with VCFS had appeared to be schizophrenic because of the severity of their untreated mania.

In the general U.S. population, manic depression affects about 1 in 100 people at some time in their lives and usually first emerges in young adulthood. In the VCFS sample, however, this psychiatric disorder was far more common and typically began at age 12. In many cases, it included rapid shifts between mania and depression, each state lasting only a day or two, Papolos holds.

In addition, nine participants received a diagnosis of attention deficit disorder (ADD), some with hyperactivity. Five people displayed both ADD and manic depression.

A gene known to be located in the deleted chromosome 22 region produces an enzyme that activates two chemical messengers, dopamine and norepinephrine. These substances have been implicated in manic depression, according to Papolos. He and his colleagues plan to examine deletions of this gene more extensively, both in people with VCFS and the population at large.

"For now, I consider this new report an interesting speculation," comments psychiatrist Elliot S. Gershon, chief of the clinical neurogenetics branch at the National Institute of Mental Health (NIMH) in Bethesda, Md. "We'll have to see if the results hold up in future studies."

He adds that four studies indicate that a gene located elsewhere, on chromosome 18, helps to produce manic depression in some people (SN: 7/2/94, p. 13).

The missing chromosome 22 region cited by Papolos' group may contain one or more genes that influence different mental disorders, depending on the presence of other DNA variations, Gershon suggests.

COPYRIGHT 1997 Science Service, Inc.
COPYRIGHT 2004 Gale Group

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