Trisomy 18 and trisomy 21 mosaicism in a Down's syndrome patient.

Trisomy 21 mosaicism in a woman with two children with trisomy 21 Down's syndrome.

Trisomy 21 mosaicism in a woman with two children with trisomy 21 Down's syndrome* Summary. Trisomy 21 mosaicism was identified by fluorescent quinacrine banding in a phenotypically normal mother, who gave birth to two children with trisomy 21 Down's syndrome. Trisomy 21 Down's syndrome associated with maternal mosaicism was first described by Smith et al in 1962. Since then there have been at ...

Trisomy 3 mosaicism in a patient with Bartter syndrome.

Trisomy 18 mosaicism: report of two cases.

BACKGROUND Mosaic trisomy 18 has a wide phenotypic spectrum ranging from near normal to early death. We report two cases that add to our knowledge of the disease. METHODS Patient 1 was a girl with a tracheoesophageal fistula, horse-shoe kidneys and a ventricular septal defect. Karyotyping of her lymphocytes showed complete trisomy 18. Due to her milder phenotypes, skin fibroblasts were karyot...

The trisomy 18 syndrome

The trisomy 18 syndrome, also known as Edwards syndrome, is a common chromosomal disorder due to the presence of an extra chromosome 18, either full, mosaic trisomy, or partial trisomy 18q. The condition is the second most common autosomal trisomy syndrome after trisomy 21. The live born prevalence is estimated as 1/6,000-1/8,000, but the overall prevalence is higher (1/2500-1/2600) due to the ...

Edwards' Syndrome (Trisomy 18)

The Edwards' syndrome phenotype results from full, mosaic or partial trisomy 18q. Full trisomy 18 is the most common form occurring in about 94% of cases. In full trisomy every cell contains three full copies of chromosome 18. Mosaics can occur in about 5% of cases in which some cells are normal with 46 chromosomes and others have the extra chromosome. Partial trisomy 18 can (rarely) occur if a...