Patient's question:
What is a chromosomal abnormality?Doctor's answer:
Hello! Chromosomes are an important component of cells; they are the material basis of heredity, meaning that many human traits (such as appearance, facial features, personality, etc.) and diseases are inherited through chromosomes. Abnormalities in chromosomes can cause many genetic diseases. The normal number of chromosomes in humans is 46, of which 2 are sex chromosomes and 44 are autosomes. Although reproductive issues are primarily determined by sex chromosomes, the role of autosomes should not be overlooked. Most abnormalities in chromosomes are manifested as changes in their number and structure. Abnormalities in chromosome number refer to having one extra or one missing chromosome. For example, a common primary testicular hypoplasia in males is caused by an extra X chromosome, resulting in a karyotype of 47,XXY. Because this condition was first reported by Kleinfelter in 1942, it is now known as Kleinfelter syndrome. Its main manifestations include: a female-like body type, small testicles, underdeveloped penis, and female-like breast development. Although some individuals can still engage in sexual activity, most cannot. Abnormalities in chromosome structure occur because chromosomes are prone to breaking. If they are repaired by enzymes and reattached without being restored to their normal state, various types of can occur. The common types include translocation, ring chromosomes, inversion, and deletion. Regardless of whether the abnormalities are in the number or structure of chromosomes, they can affect sexual differentiation and development, leading to true or false hermaphroditism, precocious puberty, delayed sexual development, and incomplete sexual development (such as hypogonadism, testicular atrophy, and genetic defects in reproductive organs). Additionally, they can cause male infertility or lead to habitual miscarriages in females. It is clear that chromosomes play a crucial role in sexual development and reproduction in the human body. Checking for chromosomal abnormalities is a common diagnostic method in urology. Although there is currently no fundamental treatment for chromosomal abnormalities, understanding the situation can avoid unnecessary medication and allow for targeted treatment based on the specific condition, which greatly benefits improving the condition, addressing sexual function, and resolving fertility issues.