microdeletion

microdeletion

Loss of a piece of chromosome too small to be seen by microscopy. Detection of microdeletions requires high-resolution chromosome banding, molecular chromosome analysis with FISH, or DNA analysis.

microdeletion

The loss or removal of a small amount of genetic information (a small number of nucleotides) from a chromosome.
References in periodicals archive ?
Williams syndrome (WS) is a rare multisystemic disorder caused by a microdeletion of chromosome 7 and is associated with dysmorphic facial features, supravalvular aortic stenosis (SVS) and other cardiovascular diseases, mental retardation, infantile hypercalciemia, and growth deficiency.
Association between microdeletion and microduplication at 16p11.
The investigators then identified a rare microdeletion within CNTNAP2 that was present in an autistic child and his father but not in 1,000 control chromosomes.
Cytogenetically del22q11 syndrome as described earlier is characterized by a microdeletion on chromosome 22q11.
In your work-up, consider these malformation syndromes that may be associated with aplasia curls congenita: Opitz syndrome, Adams-Oliver syndrome, Trisomy 13-15 syndrome, 4p syndrome, Johanson-Blizzard syndrome, and Xp22 microdeletion.
Williams syndrome (WS) is a rare genetic disorder which affects 1 in 25,000 to 50,000 live births and results from a microdeletion on chromosome 7 affecting one of the alleles of the elastin gene (Korenberg, Chen, Hirota et al.
The finding that the "genotype Orientalis was involved in all three pandemics" is not valid since the Orientalis type is defined by a biochemical assay, resulting in all known Orientalis strains from a 93-bp glycerol-3-phosphate dehydrogenase microdeletion (4,5), which was not investigated here.
The task now is to standardize molecular cytogenetic techniques, we are actually working with PRINS in order to study submicroscopic subtelomeric rearrangements associated with mental retardation and other microdeletion syndromes as well.
It is important for physicians to be able to detect common and severe aneuploidies and microdeletion syndromes quickly and accurately so that they can work with expectant parents and clinicians to modify the management of the pregnancy and create the best possible healthcare support network for the baby and parent.
FISH testing is also still carried out in constitutional laboratories, primarily for rapid prenatal testing as well as post-natal testing for microdeletion syndromes, although the post-natal use of FISH has declined with the uptake of array testing.