Track topics on Twitter Track topics that are important to you
The purpose of this research is to study a new way to test for chromosome abnormalities. Chromosomes are strands of DNA (the genetic material in the cell nucleus) that are made up of genes-the units of heredity. Chromosome abnormalities are usually investigated by staining the chromosomes with a dye (Giemsa stain) and examining them under a microscope. This method can detect many duplications and deletions of pieces of chromosomes and is very accurate in diagnosing certain abnormalities. It is not useful, however, for identifying very small abnormalities. This study will evaluate the accuracy of a test method using 24 different dyes for finding small chromosome abnormalities.
Children and adults with various chromosome abnormalities may be eligible for this study, including, for example, people with developmental delay or mental retardation, abnormal growth features or growth retardation, and certain behavioral disorders. Participants will be evaluated in the clinic over a 1- to 3-day period, depending on their symptoms. All participants will be examined by a genetics specialist and will have a physical examination and possibly X-rays, computerized tomography (CT) scans, magnetic resonance imaging (MRI), ultrasound studies and medical photography. Blood will be drawn for chromosome testing-about 3 tablespoons from adults and 1 to 3 teaspoons from children.
When the test results are available, participants will return to the clinic for follow-up evaluation and review of the test findings. The genetic and medical evaluations, along with their implications, will be discussed.
There is a range of genomic aberrations from aneuploidy down to single base pair deletions or inserts. Present technology uses microscopic cytogenetics for detection of large rearrangements (greater than 2 Mb) and molecular techniques for small rearrangements (less than 2 Mb). There is a gap in practical diagnostic technology in that microscopic cytogenetics has poor sensitivity for aberrations less than 5 Mb and the molecular techniques are cumbersome for clinical use in the megabase range. In many cases it is possible to determine that an aberration is present by microscopic cytogenetics but cannot be characterized. We propose to use Spectral Karyotyping (SKY) and supplementary FISH and molecular techniques to characterize these aberrations. Subjects will be seen in OP9 for a clinical genetics evaluation and phlebotomy for SKY. Confirmation of SKY results will be performed by standard FISH, genomic content mapping, and other standard techniques.
National Human Genome Research Institute (NHGRI)
National Institutes of Health Clinical Center (CC)
Published on BioPortfolio: 2014-08-27T03:59:31-0400
Low back pain is a frequent cause of disability and a common reason for outpatient care in veterans. Magnetic resonance imaging (MRI) of the lower back often reveals abnormalities,which ma...
Our hope is that the information from this retrospective study will provide information to better serve our patients and their parents with risk stratification (levels of risk) and clinica...
Nail surface abnormalities is any conditions that affect the nail matrix or nail bed which cause nail plates grow defectively. Common nail surface abnormalities are pitting nails, longitud...
This study will examine the effects of spinal cord abnormalities on perioperative neurovesical dysfunction in patients with anorectal abnormalities.
Metformin has been used for alleviating metabolic abnormalities in patients with schizophrenia. Until now, the lowest dose of metformin to treat metabolic abnormalities in clozapine-treate...
Structural chromosome abnormalities can cause significant negative reproductive outcomes as they typically result in morbidity and mortality of newborns. The prevalence of structural chromosomal abnor...
Cell-free DNA (cfDNA) testing for common fetal trisomies (T21, T18, T13) is highly effective. However, the usefulness of cfDNA testing in detecting other chromosomal abnormalities is unclear. We evalu...
The aim of this study is to evaluate the frequency and nature of chromosomal abnormalities in Moroccan couples with recurrent spontaneous miscarriage (RSM). In addition, the data were compared with th...
Hypercholesterolemia is one of the modifiable risk factors for atherosclerosis and cardiovascular diseases. Prevention and treatment of hypercholesterolemia and other lipid abnormalities require relia...
The study analyzes the clonal architecture and the abnormalities involved in a series of 191 patients with myelodysplastic syndromes (MDS) and 2-3 clonal abnormalities. All patients were extracted fro...
Congenital abnormalities caused by medicinal substances or drugs of abuse given to or taken by the mother, or to which she is inadvertently exposed during the manufacture of such substances. The concept excludes abnormalities resulting from exposure to non-medicinal chemicals in the environment.
Congenital abnormalities that affect more than one organ or body structure.
Congenital structural deformities, malformations, or other abnormalities of the cranium and facial bones.
Congenital structural abnormalities of the mouth and jaws, including the dentition.
Congenital structural deformities, malformations, or other abnormalities of the maxilla and face or facial bones.
Bioinformatics is the application of computer software and hardware to the management of biological data to create useful information. Computers are used to gather, store, analyze and integrate biological and genetic information which can then be applied...
DNA sequencing is the process of determining the precise order of nucleotides within a DNA molecule. During DNA sequencing, the bases of a small fragment of DNA are sequentially identified from signals emitted as each fragment is re-synthesized from a ...