Patient's question:
Does the increase in the 22nd chromosome satellite 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 chromosomal 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 radiological radiation and occupational exposure. Ionizing radiation is particularly notable for causing chromosomal non-disjunction. Experiments have shown that when comparing oocytes at the MⅡ stage in irradiated mice with those in non-irradiated mice of the same stage, non-disjunction is significantly higher in the irradiated group, especially in older mice. In humans, lymphocytes exposed to radiation or grown in irradiated serum show a higher frequency of trisomy compared to the control group, along with chromosomal aberrations such as dicentric chromosomes, translocations, and deletions.
2. Chemical Factors: People are exposed to various chemicals in daily life, some of which are natural products while others are synthetically produced. These chemicals enter the human body through dietary intake, 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 enter the nuclear network 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 new individual development 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 maturation and the behavior of chromosomes during the late stage of division, promoting 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 chromosomal non-disjunction. For example, elevated primary autoimmune antibodies for the thyroid are closely related to 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.