PhD student Carolyn Marks to defend doctoral thesis in December

PhD student Carolyn Marks is set to defend her thesis, entitled “Regulatory mechanisms in olfactory system assembly and function”, on December 7, 2012. Her external examiner will be Professor Charles Greer from Yale University. Faculty members in the thesis committee will be Professors Ole Kiehn (KI), Jonas Muhr (KI), Tibor Harkany (KI) and Anders Lansner (KTH). Watch this space for updates on thesis nailing and other rituals.

New paper reveals role of activin receptor ALK7 in female reproduction

The FASEB Journal has published our paper on the role of the activin receptor ALK7 in the control of female reproduction (Sandoval-Guzman et al. 2012). In this work, we investigated the expression and function of the activin receptor ALK7 in the female reproductive axis using Alk7-knockout mice.

Alk7-knockout females showed delayed onset of puberty and abnormal estrous cyclicity, had abnormal diestrous levels of FSH and LH in serum, and their ovaries showed premature depletion of follicles, oocyte degeneration, and impaired responses to exogenous gonadotropins. In the arcuate nucleus, mutant mice showed reduced expression of Npy mRNA and lower numbers of Npy-expressing neurons than wild- type controls. Alk7 knockouts showed a selective loss of arcuate NPY/AgRP innervation in the medial preoptic area, a key central regulator of reproduction. These results indicate that ALK7 is an important regulator of female reproductive function and reveal a new role for activin signaling in the control of hypothalamic gene expression and wiring. Alk7 gene variants may contribute to female reproductive disorders in humans, such as polycystic ovary syndrome.

Read the full paper HERE.