Navigation Links
Dangerous liaisons
Date:9/22/2007

percent - of the crosses produced only small necrotic and unhealthy plants. Genomics-based experiments showed that these hybrids all had a comparable profile of gene activity: A common group of some 1000 genes were either more strongly or more weakly active in the hybrids than in their healthy parents. Moreover, this pattern was very similar to what is seen with a strong immune response mounted against pathogens during a normal infection. The plant immune response typically involves the sacrifice of a few cells at and around the infection site. But in the wimpy hybrids, healthy tissue also suffered - without pathogen infection. The hybrid plants apparently mistook their own cells for dangerous germs.

Although the genes that determined the abnormal autoimmunity were different in most crosses, the researchers discovered that often only two genes were required to cause the necrotic hybrid response. One of the fatal genes came from the father, the other from the mother. In one case that the researchers studied in more detail, they found that the gene that causes necrosis in hybrids, but not in the parents, is normally used to sense the presence of a pathogen. The scientists emphasize, however, that the hybrids are not the victims of malfunctioning genes: in contrast to many hereditary diseases, the necrosis is not due to each parent carrying a defective copy of the same gene. Rather, there is a destructive interaction between two different genes, each of which evolved differently in the two parents. The genes on their own are harmless or even beneficial, since the parents are healthy. Only the combination of the altered gene variants creates problems. These types of genetic malfunction are often known as Dobzhanshy-Muller incompatibilities, after the two giants of early modern genetics who first studied these necrotic hybrids in fruit flies.

The results of the German-American team challenge the classical definition of a species, according to which ind
'/>"/>

Contact: Professor Dr. Detlef Weigel
weigel@tuebingen.mpg.de
49-707-160-11411
Max-Planck-Gesellschaft
Source:Eurekalert

Page: 1 2 3 4

Related biology news :

1. Too much water may be as dangerous as too little during long-distance athletic events
2. Colorful bacteria more dangerous
3. Dangerous tricksters: Some bacterie use immune cells to reproduce
4. The dangerous legacy of lead
5. Study identifies substances in grapefruit juice that interact dangerously with some drugs
6. Commercial fishing causes dangerous fluctuations in fish populations
7. Newly discovered behavior in cancer cells signals dangerous metastasis
8. Jefferson scientists find high glucose before surgery raises risk of dangerous complications
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/17/2014)... is the process whereby the genetic information of ... as proteins, which have numerous different functions in ... important intermediary during gene expression, by relating the ... involved in manufacturing proteins. , By examining ... present in an organism at a given time, ...
(Date:4/17/2014)... Scientists have uncovered a new way the immune system ... aid efforts to use immune cells to treat illness. ... have the immunological equivalent of "neighborhood police" specialized ... single organ, instead of an entire city, the body. ... St. Louis have shown that the liver, skin and ...
(Date:4/17/2014)... derive from Charles Darwin, whose ideas in turn ... the 19th century, a period when landowners vigorously ... from Darwin that we inherit the ideas that ... species and total human control over breeding and ... industrial setting has been applied too broadly in ...
Breaking Biology News(10 mins):Rapid and accurate mRNA detection in plant tissues 2Some immune cells defend only 1 organ 2The story of animal domestication retold 2The story of animal domestication retold 3The story of animal domestication retold 4
... time that embryonic stem (ES) cells cultured in the ... viable offspring. The research, published in the July issue ... studies, including investigation of mechanisms involved in sperm production ... Previous studies have shown that ES cells grown in ...
... San Diego have developed what they call a "Smart ... new drugs for toxic interactions or identify cells in ... blood. , Their invention, described in the June 20 ... the American Chemical Society, uses porous silicon crystals filled ...
... lend new insight into the mechanism of genomic imprinting, ... in the silencing of an imprinted gene cluster in ... gene based upon which parent it has been inherited ... human disorders, Prader-Willi and Angelman syndromes, result from the ...
Cached Biology News:Sperm created in the laboratory from embryonic stem cells produce viable progeny 2UCSD researchers develop 'smart petri dish' 2UCSD researchers develop 'smart petri dish' 3
(Date:1/14/2014)... Carahsoft and CDS Federal Services have ... at 2pm EST (11am PST), “Natural Language Processing: Converting ... how technology can turn raw, heterogeneous data into actionable ... The online webinar will last approximately one hour. , ...
(Date:1/14/2014)... York, NY (PRWEB) January 14, 2014 ... of Alliqua, Inc. (OTCQB: ALQA). Alliqua is an emerging ... to serve the wound care market. , Free report ... was restructured with a seasoned management team and Board, ...
(Date:1/14/2014)... 2014 In recent years, growing suspicion ... in product development and promotion has led to unprecedented ... fueled by concerns about the insidious impact of commercialization ... spectacular fines to the world’s biggest pharmas for illegal ...
(Date:1/14/2014)... and Cardiff, UK (PRWEB) January 13, 2014 ... development leader with more than 20 years in the ... optics and photonics . Hainsey will serve as the ... to have Dr. Hainsey join SPIE as our Technology ...
Breaking Biology Technology:Webcast - Natural Language Processing: Converting Raw Data into Actionable Knowledge – Hosted by Carahsoft and CDS Federal Services 2EquitiesIQ Initiates Coverage of Alliqua, Inc. 2EquitiesIQ Initiates Coverage of Alliqua, Inc. 3The Sunshine Act: Necessary Regulation or Unnecessary Dysregulation? New Life Science Webinar Hosted by Xtalks and IRB Services 2The Sunshine Act: Necessary Regulation or Unnecessary Dysregulation? New Life Science Webinar Hosted by Xtalks and IRB Services 3Photonics R&D Leader Bob Hainsey Joins SPIE Technical Staff 2
... Calif., April 4, 2011 MedeAnalytics announced today the ... proposed rule for the Medicare Shared Savings Program issued ... March 31, 2011. (Logo:   http://photos.prnewswire.com/prnh/20100621/SF23660LOGO ) ... Summary and Analysis of the Proposed Rule," covers a ...
... reveals a potentially highly effective treatment for heterotopic ossification ... bone tissue. HO comes in two main forms—one that ... wounded military personnel and surgery patients and is triggered ... animal study by developmental biologists shows that a drug ...
... SAN DIEGO, April 1, 2011 Optimer Pharmaceuticals, Inc. (NASDAQ: ... 2011 the Compensation Committee of its Board of Directors approved ... of 258,000 shares of common stock to 7 new employees. ... option has an exercise price per share equal to $11.83, ...
Cached Biology Technology:ACO Proposed Rule Simplified: MedeAnalytics Releases Comprehensive White Paper 2Potential Treatment Found for Debilitating Bone Disease in Wounded Soldiers and Children 2Potential Treatment Found for Debilitating Bone Disease in Wounded Soldiers and Children 3Potential Treatment Found for Debilitating Bone Disease in Wounded Soldiers and Children 4Optimer Pharmaceuticals Reports Inducement Grants Under NASDAQ Listing Rule 5635(c)(4) 2
...
Carbonate-Bicarbonate Buffer Capsules. For use in coating ELISA plates. Dissolve contents of 1 capsule in 100 ml deionized water to yield 0.05 M carbonate-bicarbonate buffer, pH 9.6....
Immunogen: Synthetic peptide: S(399) P W S E L E F Q F P D D K D P V W E F(418) Storage: -20 C, Avoid Freeze/Thaw Cycles...
Immunogen: C terminus [VQLKRSKNDSKPYC] of cardiac elav-type RNA-binding protein (ETR-3) Storage: -20 C, Avoid Freeze/Thaw Cycles...
Biology Products: