Genetics: diseases — симптомы, диагностика и лечение

Hemophilia is a hereditary blood clotting disorder in which one of the protein factors involved in the formation of a strong clot is missing. Almost exclusively men are affected, and the disease is transmitted through female carriers. The popular understanding of hemophilia is greatly distorted: it is commonly believed that a person with this diagnosis can bleed to death from a cut. In fact, minor cuts and abrasions stop almost like everyone else, because the first stage of coagulation - the work of platelets - is not impaired. The danger is different: the blood is not retained deep in the tissues, and hemorrhages occur in the joints and muscles, delayed bleeding after tooth extraction and operations. It is repeated bleeding into the joints, and not cuts, that determine the fate of the joint and the quality of life - and this is what modern treatment prevents.

Down syndrome is a genetic disorder in which cells have an extra, third copy of chromosome 21. This is not a disease in the usual sense of the word and not the result of someone’s mistake: in the vast majority of cases, an extra chromosome appears accidentally during the formation of a germ cell, and this cannot be influenced in any way. People with Down syndrome study, work, play sports, create relationships, and their life expectancy has increased over the past decades from about twenty-five years to fifty-five to sixty - largely thanks to modern cardiac surgery and competent medical support. What really changes the quality of life are two things: timely monitoring of concomitant conditions, primarily the heart and thyroid gland, and early developmental assistance, starting from the first months of life.

Klinefelter syndrome is a genetic condition in which a male has an extra X chromosome (karyotype 47,XXY). This is one of the most common chromosomal features in men and at the same time one of the most lately diagnosed: manifestations are often erased, and a significant part of men find out about their diagnosis only during an examination for infertility - or never find out. Meanwhile, early diagnosis makes it possible to start therapy on time and preserve the possibility of paternity.