Patient's question:
Does the increase in chromosome 22 satellites affect fertility and child development?Doctor's answer:
Analysis of the Condition: Chromosomes are the carriers of genes, and chromosomal disorders are caused by chromosomal abnormalities, which in turn lead to abnormal gene expression and abnormal development of the body. The pathogenesis of chromosomal aberrations is unclear, possibly due to non-disjunction of chromosomes during the late stage of cell division or the occurrence of chromosome breaks and reconnections under various internal and external factors.1. Physical Factors: The radiation environment humans are exposed to includes natural radiation and artificial radiation. Natural radiation includes cosmic radiation, terrestrial radiation, and radiation from radioactive substances in the human body. Artificial radiation includes radioactive radiation and occupational exposure. Ionizing radiation is particularly notable for causing chromosome non-disjunction. Experiments have shown that when comparing oocytes at the MⅡ stage of irradiated mice with those of the same stage that were not irradiated, non-disjunction was significantly higher in the irradiated group, a phenomenon that is especially pronounced in older mice. In humans, lymphocytes exposed to radiation or grown in irradiated serum have a higher frequency of trisomies compared to the control group, and also cause chromosomal aberrations such as dicentric chromosomes, translocations, and deletions.
2. Chemical Factors: People are exposed to various chemical substances in daily life, some of which are natural products while others are artificially synthesized. These substances enter the human body through routes such as diet, respiration, or skin contact, leading to chromosomal aberrations.
3. Biological Factors: When viruses are used to treat cultured cells, they often cause various types of chromosomal aberrations, including breaks, fragmentation, and exchanges.
4. Maternal Age Effect: By the time a fetus is 6–7 months old, all oogonia have fully developed into primary oocytes and have entered the nuclear mesh stage from the prophase of the first meiosis. At this stage, chromosomes relax and spread again, resembling the prophase nucleus, and this state persists until ovulation before puberty. This condition may be related to the synthesis of yolk. During puberty, FSH cyclically stimulates oocytes, with only one completing the first polar body each month. Secondary oocytes are released from the ovary into the fallopian tube, where they undergo the second meiosis and reach metaphase. If fertilization occurs, the egg completes the second meiosis, becomes a mature egg, and fuses with a sperm to form a zygote, marking the beginning of the development of a new individual until birth. With increasing maternal age, under the influence of many internal and external factors, oocytes may undergo various aging changes, affecting the relationship between homologous chromosomes during mature division and the behavior of chromosomes in the late stage of division, leading to non-disjunction between chromosomes.
5. Genetic Factors: Chromosomal abnormalities often exhibit a familial tendency, suggesting that chromosomal aberrations are related to genetics.
6. Autoimmune Diseases: Autoimmune diseases may play a role in non-disjunction of chromosomes. For example, there is a close correlation between increased primary autoimmune antibodies of the thyroid and familial chromosomal abnormalities.
Guidance: Chromosomal disorders cannot be cured, as every cell in the body is affected. Regarding childbirth, the specific situation needs to be analyzed, but the prospects are not very hopeful. It is still best to consult a hospital. If you have any medical test reports or similar documents, you can share them here for review.