Consanguineous Marriages: A Genetic Crisis

General
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Consanguineous marriage refers to unions between individuals who share a common ancestor most often the first cousins. It is a common practice in countries belonging to the Middle East, North Africa and South Asian regions. In India, consanguineous marriages are more prevalent in the southern states which includes Tamil Nadu, Karnataka, Andhra Pradesh and Telangana.

Studies have found that consanguineous marriages can lead to autosomal recessive genetic disorders in the offsprings of the married couples. These disorders include spinal muscular atrophy, Tay-Sachs disease, Albinism, Cystic Fibrosis etc. Let’s understand the mechanism why this happens.

Consanguineous couples carry large proportions of similar genes These leads to an increase likelihood of both the partners carrying the same recessive mutations. Most harmful mutations are recessive which means their effects only appear when both versions of the genes are harmful. Due to this, there is a higher risk that their children will carry two faulty alleles (different versions of a gene) inherited from their parents and thus develop genetic disorders .

In genetically unrelated couples there is less chance of both the partners carrying the same recessive mutations and thus lesser risk of development of genetic disorders in children. For preventing the risk of genetic disorders in the children of consanguineous couples, procedures like genetic counselling and prenatal diagnosis can be performe d.

Apart from the development of genetic disorders in children, consanguineous marriages also lead to decrease in genetic diversity. This is due to inheritance of similar alleles from the parents by the child. This leads to increase in homozygosity (identical alleles of a gene) and decrease in genetic diversity. Decrease in genetic diversity makes populations with a high rate of consanguineous marriages easily prone to diseases and more susceptible to climatic chang es.

Impact of Consanguineous Marriages on Genetic Health
Impact of Consanguineous Marriages on Genetic Health1443Ă—869 198 KB

In today’s time, consanguineous marriages are common in rural areas due to lack of awareness about their genetic impacts. To address this issue, community-based awareness program needs to be effectively organized. Integration of scientific understanding in the minds of the people will help them in taking informed marriage and reproductive decisions. This will reduce prevalence of consanguineous marriages and improve hea lth.

Can you think of any other innovative ways to create awareness regarding this issue? Comment below.

MBH/PS

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I think most people are aware. We need rules and regulations.

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I live in Latvia and here there is a rule that you cannot marry a person who is your close 1° degree relative including first cousins. Such a serious law should be applied in India too. Another way of stopping this is by not glorifying actors/actresses that have consanguineous marriages as many people follow them.

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(post deleted by author)

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Yes, most of the people are aware. However, for people from previous generations who were not that educated awareness may be lacking.

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Yes rightly said.

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I think it’s really important to clearly distinguish between cultural beliefs and evidence-based health facts. When the two overlap, decisions should be guided by what is medically safe rather than what is traditionally accepted.

For example, consanguineous marriages are culturally common in many communities, but they carry significant genetic risks, often leading to more severe expression of inherited disorders in children. That’s why increasing awareness around these implications is so important.

This was a really insightful read.

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Many people are about it but restrictions should be implemented on them