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Cytogenetic heteromorphisms are described as heritable variations at specific chromosomal regions without phenotypic effect. Polymorphisms of the size of heterochromatic centromeric regions of chromosomes 1, 9 and 16 have been well documented in humans but only four previous reports described centromeric polymorphism of chromosome 6. We present a prenatal diagnosis of a rare de novo centromeric chromosome...
It is known from postnatal diagnosis that imbalances of the subtelomeric regions contribute significantly to idiopathic mental retardation.We report a case of a 4-year-old child with growth retardation, minor physical abnormalities, hypotonia and developmental delay associated with a derivative chromosome 4. Molecular cytogenetic investigations were performed to characterize the chromosomal rearrangement...
Cytogenetics is the part of genetics that deals with chromosomes, particularly with numerical and structural chromosome abnormalities, and their implications in congenital or acquired genetic disorders. Standard karyotyping, successfully used for the last 50 years in investigating the chromosome etiology in patients with infertility, fetal abnormalities and congenital disorders, is constrained by...
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