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Premature ovarian insufficiency (POI) is impairment of the ovaries and how they work before the age of 40 years. It can be caused by multiple factors, one being genetic. Genes and their influence determine the initial number of the primordial follicles, impact on the rate of follicular atresia, and are impactful on the age of menopause.
Hypergonadotropic hypogonadism (HH), also known as primary or peripheral/gonadal hypogonadism or primary gonadal failure, is a condition which is characterized by hypogonadism which is due to an impaired response of the gonads to the gonadotropins, follicle-stimulating hormone (FSH) and luteinizing hormone (LH), and in turn a lack of sex steroid production. [1]
Increased levels of these hormones will cause the body to not start puberty, not undergo menarche, and not develop secondary sex characteristics. [9] [10] If ovarian tissue is present and produces some amount of hormones, limited menstrual cycles can occur. [9] 46,XX gonadal dysgenesis can manifest from a variety of causes. [6]
In men, it causes impaired muscle and body hair development, gynecomastia, decreased height, erectile dysfunction, and sexual difficulties. If hypogonadism is caused by a disorder of the central nervous system (e.g., a brain tumor ), then this is known as central hypogonadism .
Hyperprolactinaemia is the most common cause of AHH. It is a well-established cause of infertility in both male and female mammals. [13] Prolactin inhibits GnRH neurons and therefore inhibits the subsequent release of LH, FSH and sex steroids. The mechanism of prolactin induced inhibition of GnRH release is poorly understood. [13]
It can result in chronic kidney failure, hypoalbuminemia, which can cause ascites and peripheral edema, and nephrotic syndrome, which can cause hypertension or hypercoagulability. [156] Familial renal disease is an uncommon cause of kidney failure in young dogs. Most causes are breed-related (familial) and some are inherited.
Primary ovarian insufficiency (POI). This is when a woman’s ovaries stop functioning normally before age 40. This condition is often linked to genetic, metabolic, or immune system disorders ...
Gonadotropin-releasing hormone (GnRH) insensitivity also known as Isolated gonadotropin-releasing hormone (GnRH) deficiency (IGD) is a rare autosomal recessive genetic and endocrine syndrome which is characterized by inactivating mutations of the gonadotropin-releasing hormone receptor (GnRHR) and thus an insensitivity of the receptor to gonadotropin-releasing hormone (GnRH), resulting in a ...