Patient's question:
My parents are first cousins, and I'm perfectly fine. Now my girlfriend knows that my family has a history of inbreeding, and she wants to go for a chromosome check with me. I'd like to ask, if the chromosomes are normal, can we have a healthy baby? If we want to have a healthy baby, what aspects should we pay attention to?Doctor's answer:
Medical Analysis: Hello, generally there is no problem. Hello friend, based on your question, it is considered that the risk of children born from consanguineous marriage suffering from hereditary diseases is much higher than those born from non-consanguineous marriage. Why do consanguineous marriages increase the incidence of hereditary diseases in offspring? Because the inheritance of organisms is completed through the transmission of genetic information. Genes are the material basis of inheritance, passed down through germ cells to offspring, allowing the traits of parents to be expressed in the next generation. There is a 1/2 chance that a child shares the same genes with each parent; all siblings share a 1/2 chance of having the same genes; grandparents, uncles, nieces, etc., share a 1/4 chance; while first cousins,, etc., share a 1/8 chance. Some hereditary diseases have recessive causative genes. If one party carries this gene while the other does not, the causative gene can be masked, so the offspring will not be affected. Only when both partners carry this recessive gene will the offspring be affected. Therefore, consanguineous marriage increases the risk of recessive hereditary diseases, such as albinism, congenital deafness and mute; cerebellar malformation, phenylketonuria, galactosemia, etc.; it can also increase the incidence of polygenic hereditary diseases, common ones include hydrocephalus, spina bifida, anencephaly, schizophrenia, congenital heart disease, epilepsy, etc.Advice: If the recessive gene is on the X chromosome, since females have two X chromosomes, they may inherit a homozygous genotypic from a common ancestor, while males are heterozygous and do not have the issue of homozygosity, so consanguineous marriage has no effect on the sons born. Alternatively, if a causative gene is determined to be X-linked recessive, marriage between first cousins or will not pass the disease to their children, but marriage between uncle-nephew or aunt-nephew cousins carries a higher risk of X-linked gene inheritance than autosomal genes. In your case, there is no problem. You should not carry the recessive gene on the X chromosome.
Lifestyle Care: Whether there are other genetic defects needs further examination to clarify.