Intron Presence-Absence Polymorphisms in Daphnia
نویسندگان
چکیده
منابع مشابه
Intron presence-absence polymorphisms in Daphnia.
Here, we report 2 novel intron gains segregating in populations of Daphnia pulex endemic to Oregon. These novel introns do not have an obvious source and are not present in any D. pulex populations outside Oregon, other species of Daphnia that we examined, or any other organism for which sequence data are available. Furthermore, the novel introns are both found in the same gene, a Rab GTPase (r...
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Temporal sequences of allele frequencies in natural populations of Daphnia are analyzed to obtain the mean and variance of the selection coefficient for both asexual and sexual phases. In general, the alleles at enzyme loci appear to be quasi-neutral. Although significant variation exists for the estimated selection coefficients, the means are in all cases close to zero. Estimates of the varian...
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Comparisons of intron-exon structures between homologous genes in different eukaryotic species have revealed substantial variation in the number of introns. These observations imply that, in each case, an intron presence-absence polymorphism must have existed in the past. Such a polymorphism, created by a recent intron-loss mutation, is reported here in a eukaryotic organism. This gene structur...
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Methods This is a prospective & observational study. The total sample (120) was divided into two groups, Test (60) and Control (60). Both Test & Control group (Witnessed & Unwitnessed) were contacted over telephone, their psychological state was assessed using a standard stress assessment scale, The Impact of Event Scale (IES) by M. Horowitz et al. A structured proforma was prepared to record t...
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ژورنال
عنوان ژورنال: Molecular Biology and Evolution
سال: 2008
ISSN: 0737-4038,1537-1719
DOI: 10.1093/molbev/msn164