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By Randy, Ph.D. Brooks

ISBN-10: 1572228261

ISBN-13: 9781572228269

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On the other hand, of the 45 or so imprinted genes that have been identified so far, seven have been shown by genetic analysis to have an effect on fetal growth as judged by altered birth weights of pups (Table 2). IGFBP IGF IGF2 Extracellular ligandbinding domain receptor-mediated Proliferationand metabolic responses IMPRINTED GENES 23 We propose that additional imprinted genes that affect fetal growth will either turn out to be interacting components of the IGF system (GrblO is a strong candidate, for example), or will turn out to be genes that act in the placenta and affect nutrient transfer (perhaps M a d 2 or placental Igf2, see below).

There is another very important phenomenon in mammals, which is an indirect effect. If you do something to the placenta and not the fetus, what happens then? We have specifically knocked out a placenta-specific I&? transcript, which is only expressed in the labyrinthine trophoblast of the placenta. There is no effect on fetal I d 2 expression or levels of peptide, and these mice are born 70% smaller, so they show intrauterine growth retardation. We don’t have any formal proof that the placenta is the only thing that is damaged, but we are hoping to carry out transport assays across the placenta to get to that stage.

IGFl acts exclusively in the fetus (and postnatally), but the IGF2 system acts both in the fetus and in the placenta. , In$,IdZr) and it is thus mainly the IGF2 system that has imprinted components. On the other hand, of the 45 or so imprinted genes that have been identified so far, seven have been shown by genetic analysis to have an effect on fetal growth as judged by altered birth weights of pups (Table 2). IGFBP IGF IGF2 Extracellular ligandbinding domain receptor-mediated Proliferationand metabolic responses IMPRINTED GENES 23 We propose that additional imprinted genes that affect fetal growth will either turn out to be interacting components of the IGF system (GrblO is a strong candidate, for example), or will turn out to be genes that act in the placenta and affect nutrient transfer (perhaps M a d 2 or placental Igf2, see below).

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BarCharts QuickStudy Biology by Randy, Ph.D. Brooks


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