HOME >> BIOLOGY >> NEWS
Growth disorder gene plays a big role in normal size variation

The presence of a small number of discrete forms - as you find in a classic Mendelian trait like eye color - suggests that the phenotype is controlled by a very small number of genes. In contrast, a complex trait such as body size is influenced by multiple genes as well as environmental factors, giving rise to a continuous spectrum of phenotypes. This causal complexity makes discovery of the genetic determinants of the trait - so-called quantitative trait loci (QTLs) - very difficult. In the open-access journal PLoS Biology, Fiona Oliver, Julian Christians, and colleagues extend their work on a single QTL with a large effect on body size variation in mice, and show that the responsible gene is one already linked to a Mendelian growth disorder in humans.

In this study, the authors further refined the map of a QTL on the X chromosome associated with a 20% difference in growth rate of mice, and found it contains only four genes: glypican-3 and glypican-4 (Gpc3 and Gpc4), and two other genes of unknown function. The glypicans are membrane-bound growth regulators; loss of function of Gpc3 in humans causes a rare syndrome of overgrowth, skeletal and other abnormalities, and neonatal death. In Gpc3, but not the others, size correlated with a significant difference in gene expression: larger mice had low levels of the messenger RNA, and smaller mice had high levels - the same pattern seen in the human loss-of-function disorder. The authors identified several non-coding polymorphisms in Gpc3 that differed between the two forms, although it remains to be seen whether the differential effect on growth is due to these or other DNA differences nearby.

The results from this study point out an important feature of inheritance, namely, that a gene implicated in a Mendelian trait can also contribute to quantitative variation. While catastrophic expression failure, such as a loss of function, can cause disease, smaller changes in expression of the same
'"/>

Contact: Paul Ocampo
pocampo@plos.org
415-624-1224
Public Library of Science
4-Apr-2005


Page: 1 2

Related biology news :

1. Growth factors and environment combine to increase brain maturation
2. Growth factor signals influence balance between normal growth and cancerous growth
3. Growth factor triggers growth of new blood vessels in the heart
4. Growth factor-promoting angiogenesis expressed in tumor cells and normal neurons
5. Growth hormone is made in the brain, report scientists
6. Growth hormone, obesity can trigger sleep apnea in some kids
7. Growth in biomass could put US on road to energy independence
8. Growth factor in baby formula could reduce NEC, most devastating GI disease in preemies
9. Growth in the sea comes down to a struggle for iron
10. Growth of common skin cancer blocked in gene-switch mice
11. Growth factors confer immortality to sperm-generating stem cells

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:8/26/2020)... , ... August 25, 2020 , ... ... manufacturing solutions for drugs, biologics, cell and gene therapies, and consumer health products, ... Annual PEGS Boston Virtual Conference & Expo, taking place between Aug. 31 – ...
(Date:8/21/2020)... (PRWEB) , ... August 19, 2020 , ... ... the premier conference and expo uniting life science, data science, informatics and IT ... sessions. , “In this period of uncertainty and change, Bio-IT takes the leadership ...
(Date:8/7/2020)... ... August 06, 2020 , ... Nine middle school teachers from ... Program, a unique professional development program that provides advanced STEM (science, technology, engineering ... teachers nationwide. , Created in partnership between the National Stem Cell Foundation and ...
Breaking Biology News(10 mins):
(Date:7/10/2020)... ... July 09, 2020 , ... ... announced today that Massachusetts Institute of Technology (MIT) has expanded the company’s ... allows PathSensors to move into the point-of-care diagnostic market, focusing initially on ...
(Date:7/10/2020)... ... 2020 , ... Sentien Biotechnologies, Inc., a clinical-stage biotechnology company ... Nissenson, M.D., F.A.C.P., as its Chief Medical Officer. Dr. Nissenson will join ... Dr. Nissenson serves as an Emeritus Professor of Medicine at the David ...
(Date:7/7/2020)... ... July 06, 2020 , ... ... from Roche, Eli Lilly, Bristol-Myers Squibb, the University of Chicago, Massachusetts General Hospital, ... has hosted an elite awards program, highlighting outstanding examples of how technology innovations ...
(Date:7/1/2020)... ... June 29, 2020 , ... The Interlocal Purchasing ... to its membership, recently named BioFit Engineered Products an Awarded Vendor. ... purchase ergonomic seating, cafeteria tables, book trucks and carts at discounted pricing without ...
Breaking Biology Technology:
Cached News: