Maternal control of nutrient allocation in plant seeds by genomic imprinting
Costa, Liliana M., Yuan, Jing, Rouster, Jacques, Paul, Wyatt, Dickinson, Hugh and Gutierrez-Marcos, José F.. (2012) Maternal control of nutrient allocation in plant seeds by genomic imprinting. Current Biology, Vol.22 (No.2). pp. 160-165. ISSN 0960-9822Full text not available from this repository.
Official URL: http://dx.doi.org/10.1016/j.cub.2011.11.059
Imprinted genes are commonly expressed in mammalian placentas and in plant seed endosperms, where they exhibit preferential uniparental allelic expression. In mammals, imprinted genes directly regulate placental function and nutrient distribution from mother to fetus [1-4]; however, none of the >60 imprinted genes thus far reported in plants have been demonstrated to play an equivalent role in regulating the flow of resources to the embryo [5-7]. Here we show that imprinted Maternally expressed gene1 (Meg1) in maize  is both necessary and sufficient for the establishment and differentiation of the endosperm nutrient transfer cells located at the mother:seed interface. Consistent with these findings, Meg1 also regulates maternal nutrient uptake, sucrose partitioning, and seed biomass yield. In addition, we generated an imprinted and nonimprinted synthetic Meg1 ((syn)Meg1) dosage series whereby increased dosage and absence of imprinting both resulted in an unequal investment of maternal resources into the endosperm. These findings highlight dosage regulation by genomic imprinting as being critical for maintaining a balanced distribution of maternal nutrients to filial tissues in plants, as in mammals. However, unlike in mammals, Meg1 is a maternally expressed imprinted gene that surprisingly acts to promote rather than restrict nutrient allocation to the offspring.
|Item Type:||Journal Article|
|Subjects:||Q Science > Q Science (General)|
|Divisions:||Faculty of Science > Life Sciences (2010- )|
|Journal or Publication Title:||Current Biology|
|Official Date:||24 January 2012|
|Number of Pages:||6|
|Page Range:||pp. 160-165|
|Access rights to Published version:||Restricted or Subscription Access|
|Funder:||Royal Society , ESF/RTD , Biotechnology and Biological Sciences Research Council (Great Britain) (BBSRC)|
|Grant number:||FA0903 (ESF/RTD ), BB/E008585/1 BB/F008082 (BBSRC)|
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