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Impaired gonadal development in the sea trout (Salmo trutta) x Atlantic salmon (Salmo salar) F1 hybrid females

Ziomek E., Dębowska M., Hliwa P., Ocalewicz K.

Oceanological and Hydrobiological Studies

2016

Vol. 45, No. 3

337--343

Despite large karyotype differences between parental species, the hybrid progeny of the sea trout (Salmo trutta) females (2n = 80, FN = 100) and the Atlantic salmon (Salmo salar) males (2n = 58, FN = 74) may be viable and even fertile. As hybrids would pose threat to natural populations of parental species through backcrossing, gonadal development in the sea trout × Atlantic salmon hybrids has been studied in the present work. Moreover, cytogenetic investigation was performed to identify any changes in the number and structure of chromosomes that may affect gonadal differentiation and gamete production in the hybrid progeny. Eight males, two intersex individuals and one female were described among the two-year-old hybrids. Some of the hybrid males were already spermiating during the study. Predominance of the testicular component in the gonads was observed in both intersex individuals. Prevalence of males and the presence of intersex individuals together with only one female may suggest disturbances in the gonadal development only in females. Homogeneity of the chromosome number (69) and the chromosome arm number (87) in the hybrid individuals analyzed in this study suggests that unpaired chromosomes disturbed the development of ovaries but not testes.

Modelling of cell aging - system theoretic approach

Świerniak A., Kimmel M., Śmieja J., Rzeszowska-Wolny J.

Journal of Medical Informatics & Technologies

2001

Vol. 2, Part. 1

MI3--MI8

We characterize the asymptotic behavior of telomeres shortening of which is supposed to be the mechanism of aging and death. The problem is described by models in the form of infinitely many differential linear first order equations, resulting from branching random walk processes used to represent the evolution of particles in this problem, under different assumptions dealing with stochastic characterization of the process. We use control theoretical machinery based on Laplace transforms, Tauberian theorems and transfer loop reduction.

Mathematical modeling of telomere shortening: an overview

Olofsson P.

Archives of Control Sciences

1999

Vol. 9, no. 1/2

133-141

Shortening of telomeres is one of the supposed mechanisms of aging and death. This paper reviews the attempts to model and analyze this process with mathematical methods. The emphasis is put on branching process models where the main features are irreducibility and polynomial growth.