Pallister Killian mosaic syndrome

Common Name(s)

Pallister Killian mosaic syndrome, Pallister Killian Syndrome

Pallister-Killian mosaic syndrome is a disorder that is characterized by extremely weak muscle tone (hypotonia) in infancy and early childhood, intellectual disability, distinctive facial features, sparse hair, areas of unusual skin coloring (pigmentation), and other birth defects. The signs and symptoms of the Pallister-Killian mosaic syndrome can vary, although most documented cases of people with the syndrome have severe to profound intellectual disability and other serious health problems.

Pallister-Killian mosaic syndrome is usually caused by the presence of an abnormal extra chromosome 12 called isochromosome 12p. Normal chromosomes have one long (q) arm and one short (p) arm, but isochromosomes have either two q arms or two p arms. Isochromosome 12p is a version of chromosome 12 made up of two p arms. Cells normally have two copies of each chromosome, one inherited from each parent. In people with Pallister-Killian mosaic syndrome, cells have the two usual copies of chromosome 12, but some cells also have the isochromosome 12p. These cells have a total of four copies of all the genes on the p arm of chromosome 12. The extra genetic material from the isochromosome disrupts the normal course of development, causing the characteristic features of this disorder.

Although Pallister-Killian mosaic syndrome is usually caused by an isochromosome 12p, other, more complex chromosomal changes involving chromosome 12 are responsible for the disorder in rare cases.
 

Advocacy and Support Organizations

 

Condition Specific Organizations

Following organizations serve the condition "Pallister Killian mosaic syndrome" for support, advocacy or research.

Unique - Understanding Chromosome Disorders

Our mission is to inform, support and alleviate the isolation of anyone affected by a rare chromosome disorder and to raise public awareness.

Last Updated: 21 Jul 2014

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Advocacy and Support Organizations

 

Condition Specific Organizations

Following organizations serve the condition "Pallister Killian mosaic syndrome" for support, advocacy or research.

Unique - Understanding Chromosome Disorders

Our mission is to inform, support and alleviate the isolation of anyone affected by a rare chromosome disorder and to raise public awareness.

http://www.rarechromo.org

Last Updated: 21 Jul 2014

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General Resources

Little Yellow Book

A parents guide to rare chromosome disorders

Updated 4 Mar 2013

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Scientific Literature

Articles from the PubMed Database

Research articles describe the outcome of a single study. They are the published results of original research.
The terms "Pallister Killian mosaic syndrome" returned 1 free, full-text research articles on human participants. First 3 results:

Pallister-Killian syndrome: normal karyotype in prenatal chorionic villi, in postnatal lymphocytes, and in slowly growing epidermal cells, but mosaic tetrasomy 12p in skin fibroblasts.
 

Author(s): D Horn, F Majewski, B Hildebrandt, H K├Ârner

Journal: J. Med. Genet.. 1995 Jan;32(1):68-71.

 

We report on two patients with Pallister-Killian syndrome: an 18 month old male infant followed since the neonatal period and a 4 year old boy. Prenatal diagnosis by chorionic villi sampling (CVS) in the first case showed a normal karyotype without mosaicism. Chromosome analysis on ...

Last Updated: 27 Apr 1995

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Reviews from the PubMed Database

Review articles summarize what is currently known about a disease. They discuss research previously published by others.
The terms "Pallister Killian mosaic syndrome" returned 0 free, full-text review articles on human participants.

 
 
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Symptoms, Diagnosis, and Treatment

There are currently no related results available in GeneReviews.

There are currently no related results available in Genetic Testing Registry.

 
 
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Clinical Trial Information This information is provided by ClinicalTrials.gov

There are currently no open clinical trials for this condition.