Epigenetics studies how behaviors and the environment can change the way genes work without altering the underlying DNA sequence itself. These changes involve chemical modifications to the DNA or associated proteins, collectively known as the epigenome, which act like switches to turn genes "on" or "off". This process is crucial for normal development, can influence health and disease, and can sometimes be passed down to future generations.
Endometriosis and PCOS are the Yin and Yang of reproductive medicine. Endometriosis is driven by relatively low levels of prenatal and postnatal testosterone. Testosterone affects the developing hypothalamic–pituitary–ovarian (HPO) axis, and at low levels, it can result in an altered trajectory of reproductive and physiological phenotypes that can mediate the symptoms of endometriosis. Polycystic ovary syndrome, by contrast, is known to be caused primarily by high prenatal and postnatal testosterone, and it demonstrates a set of phenotypes opposite to those found in endometriosis.
Epigenetics plays a significant role in the development of autism spectrum disorder (ASD) by influencing gene expression without changing the underlying DNA sequence. These heritable modifications include DNA methylation, histone modifications, and regulation by non-coding RNAs, all of which can alter the activity of genes involved in neurodevelopment, synaptic function, and neural circuitry.
At birth, a female is endowed with approximately one to two million primordial ovarian follicles, each containing an immature egg. This number represents a woman's entire lifetime supply, as no new follicles are produced after birth. By the onset of puberty, the number of follicles declines to about 300,000 to 500,000 due to a natural process called atresia, where many follicles degenerate.
During perimenopause, a woman's body undergoes significant hormonal changes as it transitions toward menopause. This period is characterized by fluctuating levels of estrogen and progesterone due to declining ovarian function. Initially, estrogen levels can be erratic, with periods of high and low production, leading to irregular menstrual cycles.
Hormone Replacement Therapy remains the cornerstone of menopausal treatment. Understanding the use of exogenous hormones for the treatment of menopausal symptoms (Hormone Replacement Therapy (HRT)) is of critical importance to the health of women, especially given that women spend approximately 40% of their lives post-menopause.
Genetic alterations that are responsible for autism most likely occur before conception takes place. These heritable genetic alterations are present in the parental genome long before a child is conceived. Drugs taken during pregnancy are very unlikely to alter the underlying gene expression.
Migraine is a genetically influenced complex neurological disorder characterized by episodes of moderate-to-severe headaches, typically unilateral and frequently accompanied by nausea and heightened sensitivity to light and sound. These episodes, known as migraine attacks, can last hours to days and significantly impact daily activities and the quality of life of individuals.
Psoriasis is a chronic, autoimmune skin condition characterized by the overproduction of skin cells, leading to the formation of raised, red, scaly plaques on the skin. These plaques can appear anywhere on the body, but are commonly found on the elbows, knees, scalp, and trunk. Psoriasis is not contagious and is caused by an overactive immune system that mistakenly attacks healthy skin cells.
Psoriasis is a chronic autoimmune condition that speeds up the life cycle of skin cells, leading to a buildup of red, scaly, and itchy patches on the skin, most commonly on the elbows, knees, and scalp. It can also affect the nails and joints, causing a condition known as psoriatic arthritis.