Featured Research

from universities, journals, and other organizations

Chromosomal Microarray Analysis Proves Accurate

Date:
March 30, 2007
Source:
Baylor College of Medicine
Summary:
Chromosomal microarray analysis, a two-year-old gene-chip technology used to look for potential genetic abnormalities in children, has proved to be remarkably sensitive in detecting abnormalities in individual chromosomes.

Two years and more than 2,000 samples after researchers at Baylor College of Medicine started to use a new gene-chip technology called chromosomal microarray analysis to look for potential genetic abnormalities in children, they find that it is remarkably sensitive in detecting abnormalities in individual chromosomes, according to a report that appears in the journal Public Library of Science ONE.

Related Articles


"Chromosomal microarray analysis is far better at picking up these abnormalities than other common methods," said Dr. Arthur Beaudet, chair of the department of molecular and human genetics at BCM and an author of the paper. "It allows us to identify the source of abnormalities in many cases."

He said the technique does not help with identifying the problem in all children, but there is a five to 12 percent chance that it will identify an abnormality in children with various disabilities where the previous chromosomal testing did not. This study involved two versions of the test, and the newer version was more successful in identifying chromosomal abnormalities.

The targeted microarray analysis used here is essentially a gene chip method of assessing the makeup of chromosomes in a particular part of the human genome (genetic blueprint).

In areas of the genome, there are portions of the genetic material that show imbalances because they are duplicated or deleted abnormally with gains and losses of genetic information.

"If these changes are big enough, they can cause significant disabilities," said Beaudet.

The technique used is also much more efficient, making it possible to do the equivalent of a couple of thousand of more common testing methods in one test.

"If you tried to do these individually, it would be cost prohibitive," said Beaudet. Currently, chromosomal microarray analysis costs from $950 to $1,500.

In the current study, Beaudet and his colleagues analyzed the results from 2,513 samples taken from patients referred to the laboratory because they had physical or mental features that suggested one of these repetitions or deletions as a genetic cause. The array technique identified the chromosomal problem (too much or too little genetic material in a particular spot) in 8.5 percent of the total group of patients studied. This high resolution genome analysis promise to transform the practice of clinical genetics," said Beaudet.

More important, the technique found abnormalities in 5.2 percent of patients for whom more traditional techniques had not identified the genetic cause.

"We are constantly improving the test," said Beaudet. Eventually, he said, he hopes to develop tests that will look at greater areas of the genome. However, he said, there are many areas of the genome where all normal people have gains or losses of genetic material compared to the average genome.

"It is difficult to determine if it is causing a problem or not," said Beaudet. Comparing a child's genome to that of the parents can often determine if this is a normal familial variation or a disease-causing one.

Others who participated in this study included: Drs. Xinyan Lu, Chad A. Shaw, Ankita Patel, Jiangzhen Li, M. Lance Cooper, William R. Wells, Cathy M. Sullivan, Trilochan Sahoo, Svetlana A. Yatsenko, Carlos A. Bacino, Pawel Stankiewicz, Zhishu Ou, A. Craig Chinault, James R. Lupski, Sau W. Cheung and Patricia A. Ward, all of BCM.


Story Source:

The above story is based on materials provided by Baylor College of Medicine. Note: Materials may be edited for content and length.


Cite This Page:

Baylor College of Medicine. "Chromosomal Microarray Analysis Proves Accurate." ScienceDaily. ScienceDaily, 30 March 2007. <www.sciencedaily.com/releases/2007/03/070329092046.htm>.
Baylor College of Medicine. (2007, March 30). Chromosomal Microarray Analysis Proves Accurate. ScienceDaily. Retrieved December 21, 2014 from www.sciencedaily.com/releases/2007/03/070329092046.htm
Baylor College of Medicine. "Chromosomal Microarray Analysis Proves Accurate." ScienceDaily. www.sciencedaily.com/releases/2007/03/070329092046.htm (accessed December 21, 2014).

Share This


More From ScienceDaily



More Health & Medicine News

Sunday, December 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Touch-Free Smart Phone Empowers Mobility-Impaired

Touch-Free Smart Phone Empowers Mobility-Impaired

Reuters - Innovations Video Online (Dec. 21, 2014) A touch-free phone developed in Israel enables the mobility-impaired to operate smart phones with just a movement of the head. Suzannah Butcher reports. Video provided by Reuters
Powered by NewsLook.com
Earthworms Provide Cancer-Fighting Bacteria

Earthworms Provide Cancer-Fighting Bacteria

Reuters - Innovations Video Online (Dec. 21, 2014) Polish scientists isolate bacteria from earthworm intestines which they say may be used in antibiotics and cancer treatments. Suzannah Butcher reports. Video provided by Reuters
Powered by NewsLook.com
Existing Chemical Compounds Could Revive Failing Antibiotics, Says Danish Scientist

Existing Chemical Compounds Could Revive Failing Antibiotics, Says Danish Scientist

Reuters - Innovations Video Online (Dec. 21, 2014) A team of scientists led by Danish chemist Jorn Christensen says they have isolated two chemical compounds within an existing antipsychotic medication that could be used to help a range of failing antibiotics work against killer bacterial infections, such as Tuberculosis. Jim Drury went to meet him. Video provided by Reuters
Powered by NewsLook.com
Hugging It Out Could Help You Ward Off A Cold

Hugging It Out Could Help You Ward Off A Cold

Newsy (Dec. 21, 2014) Carnegie Mellon researchers found frequent hugs can help people avoid stress-related illnesses. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins