Browsing by Subject "Genetics & Heredity"

Now showing 1 - 8 of 8
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    A new look at an old disease: Is Pompe disease a neuromuscular disorder with CNS involvement?
    (Molecular Genetics and Metabolism, 2020-02) Korlimarla, Aditi; Chen, Steven; Austin, Stephanie L; Provenzale, James M; Kishnani, Priya S
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    Evolution of altruism under group selection in large and small populations in fluctuating environments
    (Theoretical Population Biology, 1979-01-01) Uyenoyama, MK
    A continuous, graded form of group selection which does not involve extinction of demes can effectively oppose selection on the individual level against an altruistic allele under fluctuating environments in infinitely large demes among which uniform mixing occurs every generation. Although group selection cannot alter the conditions necessary for the initial increase of altruistic alleles, group selection can significantly influence the stationary distribution of gene frequency which is attained once stochastic forces have allowed theirintroduction. Drift is a more effective source of variation than fluctuations in selection when the variance in selection is moderate to small. High numbers of demes promote polymorphism under both graded group selection and extinction group selection. © 1979.
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    On relatedness and adaptive topography in kin selection
    (Theoretical Population Biology, 1981-01-01) Uyenoyama, MK; Feldman, MW
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    Quantitative evaluation of white matter hyperintensities in the central nervous system in infantile Pompe disease
    (Molecular Genetics and Metabolism, 2019-02) Korlimarla, Aditi; Stefanescu, Ela; Austin, Stephanie; Chen, Steven; Provenzale, James M; Kishnani, Priya S
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    Reply to Nic Lughadha et al.
    (Trends in ecology & evolution, 2017-12) Raven, Peter H; Pimm, Stuart L
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    The effects of depression and use of antidepressive medicines during pregnancy on the methylation status of the IGF2 imprinted control regions in the offspring.
    (Clinical epigenetics, 2011-10-26) Soubry, A; Murphy, Sk; Huang, Z; Murtha, A; Schildkraut, Jm; Jirtle, Rl; Wang, F; Kurtzberg, J; Demark-Wahnefried, W; Forman, Mr; Hoyo, C
    In utero exposures to environmental factors may result in persistent epigenetic modifications affecting normal development and susceptibility to chronic diseases in later life. We explored the relationship between exposure of the growing fetus to maternal depression or antidepressants and DNA methylation at two differentially methylated regions (DMRs) of the imprinted Insulin-like Growth Factor 2 (IGF2) gene. Aberrant DNA methylation at the IGF2 and neighboring H19 DMRs has been associated with deregulated IGF2 expression, childhood cancers and several chronic diseases during adulthood. Our study population is comprised of pregnant mothers and their newborns (n = 436), as part of the Newborn Epigenetics Study (NEST). A standardized questionnaire was completed and medical record data were abstracted to ascertain maternal depression and antidepressive drug use. DMR methylation levels in umbilical cord blood leukocytes were quantified using pyrosequencing. From the 436 newborns, laboratory data were obtained for 356 individuals at the IGF2 DMRs, and for 411 individuals at the H19 DMRs; about half of each group was African American or Caucasian. While overall no association between depression and methylation profiles was found, we observed a significant hypermethylation of the H19 DMRs in newborns of African American (n = 177) but not Caucasian (n = 168) mothers who reported the use of antidepressive drugs during pregnancy (β = +6.89, p = 0.01). Of note, our data reveal a race-independent association between smoking during pregnancy and methylation at the IGF2 DMR (+3.05%, p = 0.01). In conclusion, our findings suggest a race-dependent response related to maternal use of antidepressants at one of the IGF2 DMRs in the offspring.
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    Towards a genetic theory for the evolution of the sex ratio II. Haplodiploid and diploid models with sibling and parental control of the brood sex ratio and brood size
    (Theoretical Population Biology, 1981-01-01) Uyenoyama, MK; Bengtsson, BO
    Population genetic models involving sister, brother, and father control of the brood sex ratio and brood size in both the haplodiploid and diploid cases are constructed and analyzed. The results are interpreted in light of the verbal theories which predict the evolution of the sex ratio to a value which is proportional to the ratio of relatedness of the controlling members of the family to males and to females produced in the brood. In our models, the sex ratio in a certain class of polymorphic equilibria evolves to equal investment in males and females in those cases where the controlling members of the family are symmetrically related to males and females as predicted by the verbal theory. However, the sex ratio in the case of sister control in haploidiploids does not evolve to 1:3, but rather to a value proportional to the ratio of the regression coefficients of additive genotypes. Even so, the predicted sex ratio, which is proportional to 1:3, is in fact an "ESS" in the sense that fixation of a genotype specifying that sex ratio is resistant to the initial increase of all other genotypes. © 1981.
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    Towards a genetic theory for the evolution of the sex ratio.
    (Genetics, 1979-11) Uyenoyama, MK; Bengtsson, BO
    A genetical model is formulated in which the sex ratio in broods and the relative size of broods are determined by the genotype at an autosomal locus. The results also apply to the case in which the sex-ratio locus is sex linked and expressed in the homogametic sex and to the case in which the locus is expressed in the diploid sex of a haplodiploid organism. Fisher (1930) argued that the sex ratio evolves under natural selection to a value such that parental expenditure is equalized between the sexes. Shaw and Mohler (1953) and MacArthur (1965) proposed that the sex ratio evolves to increase a certain expression for fitness. The sex ratio suggested by Fisher (1930) is in fact identical to the sex ratio specified by these maximization principles. Further, in our model, the Fisherian sex ratio corresponds exactly to the sex ratio at certain equilibria that are approached whenever they exist.