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New technology capable of detection of 150 genetic syndromes from an amniocentesis
Date:4/5/2011

This release is available in Spanish.

Genetadi Biotech has presented to the scientific community meeting at the XXVI National Congress on Human Genetics held in Murcia - a prenatal diagnostic device based on amniocentesis. More concretely, it is based on microarray technology (genomic hybridisation genetic chips) and with a diagnostic resolution 100 times greater than the common cytogenetic techniques. The new device, known as Amniochip, is able to detect 150 genetic genetic syndromes. "This involves currently validated genetic syndromes, including malformations and idiopathic mental deficiency not detected with a conventional kariotype", explained Ms Silvia vila, co-director of Genetadi.

The scientists pointed out that one of the advantages of this innovative technique is the fact that "a cell culture is not necessary". Thus, "the waiting time for the results with the new device drops to 48 hours, in contrast to the three weeks it currently takes through conventional kariotype technique".

Nevertheless, from a clinical perspective, the procedure for the diagnosis does not vary, starting with a standard amniocentesis undertaken by the specialist gynaecologist. "The sample of amniotic liquid does not differ at all from the current amniocentesis procedure", explained doctor vila. "With the Amniochip only 8 or 10 ml of amniotic liquid are necessary in a tube, and which is sent to a laboratory via messenger, exactly as with the usual genetic trials".

The application of this new technology, through a prescription from the specialist in gynaecology and obstetrics, is especially suitable for all those pregnant women who require a conventional genetic study (kariotype or FISH). That is, those suspected from ecographs of having malformations, or with positive triple marker, or the over 35s. It is also suitable for couples with a history of miscarriage, or with a family history of genetic syndromes.

In those cases in which the research using this new technology found a result with doubtful clinical significance, "the DNA of the two progenitors were also analysed; in order to discard any family polymorphic alterations", explained Dr vila.

Scientific basis

The new device for enhanced prenatal diagnosis, developed by Genetadi "is based on Comparative Genomic Hybridisation" (aCGH) microarray technology. Using this technique, "the sample to study and a reference are marked with different fluorochromes. These DNA hybridise on a crystal which contains thousands of different segments of human DNA. The regions selected on the Amniochip belong to regions of the human genome involved in more than 150 already known syndromes. Subsequently, computer software is used to identify the areas of differential hybridisation between the patient and the DNA control, thus indicating the existence of an alteration in its dosage (microdeletion or microduplication)".


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Contact: Oihane Lakar
o.lakar@elhuyar.com
34-943-363-040
Elhuyar Fundazioa
Source:Eurekalert

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