Rare metabolic diseases such as Tay-Sachs, Fabry and Gaucher syndromes are caused by enzyme deficiencies and typically have crippling, even fatal, consequences starting at very early ages. Now a team of University of Washington scientists has developed a relatively simple screening process to detect enzyme deficiencies in newborns that will allow treatment to begin before too much damage has been done.
"All of the damage from these diseases is permanent, so if you can start treatment early, in a few weeks or months, you can begin to minimize the damage," said Frantisek Turecek, a UW chemistry professor.
The technique uses a spot of blood drawn from a baby’s heel and dried on a paper card. A 2-millimeter section is punched out of the spot, then is rehydrated, the target enzymes are incubated and then measured using tandem mass spectrometry, a means of determining a substance’s chemical makeup and quantity. The sample can be screened for perhaps 15 enzyme deficiencies at the same time, and the entire process typically will take less than two days, Turecek said
So far the screening method has been effective in detecting seven diseases – Krabbe, Pompe, Niemann-Pick, Gaucher, Fabry, Tay-Sachs and Hurler syndromes – associated with enzyme deficiencies within structures called lysosomes, which break down large molecules in most cells.
In each of the diseases, babies typically are symptom free for the first few months to a year of life and then begin to show signs of the disease. The effects can appear gradually over many years or can accumulate rapidly, with the worst cases causing mental retardation, blindness and finally death by the age of 5 or 6. The diseases begin when a missing link – a deficient enzyme – in the lysosome’s biochemical chain causes waste material to accumulate in the cell.
"It’s like the garbage collectors have all gone on strike," Turecek said. "The garbage builds up, the cell struggles and eventually it dies."
The diseases are relatively rare, and typically the greatest risk lies with certain populations. Tay-Sachs, for instance, occurs most frequently in descendants of central and eastern European Jews, and about one in 30 American Jews carries the Tay-Sachs gene, an occurrence about 100 times greater than for other ethnic groups. Non-Jewish French-Canadians and Cajuns of Louisiana have a similarly elevated risk.
Some of the telltale symptoms can be very similar among all these diseases, making a medical diagnosis difficult, particularly early in life when the symptoms are not readily apparent. The new screening method will allow precise diagnosis very early, so newly developed pharmaceutical treatments can be administered in time to repair the break in the lysosome’s biochemical chain and stop further damage.
After an initial investment in mass spectrometry equipment, the new screening should have a relatively low cost, perhaps 5 cents per analysis for chemicals and materials, Turecek said. He estimates one tandem mass spectrometer could process 85,000 screenings a year, equivalent to the state of Washington’s annual birth rate.
The UW research team has been working toward a new screening method since 1998. It began using cultured skin cells but switched to blood samples three years ago. Other members of the research group are chemistry professor Michael Gelb, pediatrics professor C. Ronald Scott, chemistry graduate student Ding Wang and chemistry postdoctoral researcher Yijun Li. The work is supported by grants from the National Institutes of Health and Genzyme Corp. of Cambridge, Mass.
Turecek discusses the team’s work March 28 at the American Chemical Society national meeting during a session honoring Richard Caprioli, a Vanderbilt University biochemist who is receiving the society’s Field and Franklin Award for Outstanding Achievement in Mass Spectrometry.
Other diseases eventually can be added to those being screened for, Turecek said, and it could be possible to screen for even more with additional spectrometer runs for a given sample.
"These diseases are such a tragedy," he said. "If we can find them early enough to stop further damage, we can improve the quality of life for these kids."
Vince Stricherz | EurekAlert!
Biocompatible 3-D tracking system has potential to improve robot-assisted surgery
17.02.2017 | Children's National Health System
Real-time MRI analysis powered by supercomputers
17.02.2017 | University of Texas at Austin, Texas Advanced Computing Center
In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport
Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...
The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...
Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...
Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".
Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...
13.02.2017 | Event News
10.02.2017 | Event News
09.02.2017 | Event News
20.02.2017 | Materials Sciences
20.02.2017 | Health and Medicine
20.02.2017 | Health and Medicine