Why Central Asia Cannot Ignore Consanguineous Marriage and Autism Risk
- 3 days ago
- 9 min read
Saaid Radwan is a Behavior Analyst, Neurodiversity and Family Consultant, and Continuing Professional Development (CPD) certified trainer with 20+ years of international experience across the United Arab Emirates (UAE), the Middle East and North Africa (MENA), Europe, and Central Asia. He specializes in Applied Behavior Analysis (ABA), communication support, emotional regulation, and family-centered care, advocating inclusive, lifelong development.
In my twenty-five years of working with families across six continents, I have learned that the hardest conversations are rarely about therapy or behavior plans. They are about genetics, tradition, and the unspoken fear that a marriage choice made two generations ago may be shaping a child's diagnosis today.
Consanguineous marriage, the union of two individuals related by blood, most commonly first cousins, is one of the most culturally entrenched and scientifically consequential practices in global health. It is also one of the most politically sensitive. As I prepare to speak at the international autism conference in Tashkent next month, I am acutely aware that this topic sits at the intersection of faith, family, public health, and national policy. It cannot be shouted down, and it cannot be whispered away. It must be addressed with data, dignity, and a clear view of what is at stake.
The global map: A billion people, one pattern
Consanguineous marriage is not a fringe practice. It involves over one billion people worldwide, with prevalence rates between 20% and 50% in affected regions. In Pakistan, 50% to 60% of marriages are consanguineous. In Saudi Arabia, the figure reaches 51% to 58%. Afghanistan, Iraq, and Jordan all report rates of 40% to 50%. Morocco recently reported 26.7%, with 69.4% of those being first cousin unions.
The practice is not limited to the Middle East or South Asia. In the United Kingdom, 38% of marriages within the Pakistani heritage community in Bradford are between first cousins, and the landmark Born in Bradford study found that these unions accounted for an estimated 30% of all congenital anomalies and 25% of infant mortality in that cohort.
The science: Why related parents raise the risk
The genetic mechanism is straightforward but devastating. When parents are closely related, they are more likely to carry the same rare, recessive gene variants. If both pass the same faulty gene to a child, the child has a significantly elevated risk of developing an autosomal recessive disorder. The baseline risk of congenital anomalies in the general population is roughly 3%. For children of first cousins, that risk approximately doubles to 6%.
But the implications extend far beyond structural birth defects. A 2026 systematic review and meta-analysis examining 12 studies and 6,592 participants found a significant association between parental consanguinity and autism spectrum disorder (ASD) risk, with an adjusted odds ratio of 1.78 (95% confidence interval: 1.09 to 2.47). Other research has reported even higher odds ratios. A large study in India concluded that consanguinity increases ASD risk, with an odds ratio of 3.22.
These are not abstract numbers. They represent children who will need lifelong support, families who will face crushing emotional and financial burdens, and healthcare systems that are unprepared for the surge in demand.
The Uzbek wake-up call: 1,000 genomes and a regional reckoning
In October 2025, Uzbekistan's Center for Advanced Technologies dropped a bombshell that should have made headlines worldwide. The "1,000 Genomes of Uzbekistan" project, the country's first large-scale whole-exome sequencing study, revealed that 86% of children examined were carriers of at least one pathogenic gene, roughly twice the international average of 30% to 40%. Every second child with a rare disease carried a hereditary mutation. Nearly one third of the identified mutations had never been recorded in global scientific literature.
The researchers were unequivocal about the cause: consanguineous marriages, which make up nearly one fourth of all unions in some regions of Uzbekistan.
This is not an isolated finding. The broader Central Asian Genetic Diversity Project (CAGDP) has conducted whole-genome sequencing of 166 individuals across 20 Central Asian and Afghan populations, identifying significant genetic differentiation and characterizing the mutation spectra of candidate disease-causing variants unique to the region. Together, these projects are painting a picture that Central Asia can no longer afford to ignore: the genetic architecture of its populations carries a heavy recessive burden, and consanguinity is amplifying it.
A voice from the steppe: Tradition, responsibility, and the seven generations
Not every culture that opposes consanguineous marriage does so from a Western liberal framework. Some traditions have held this view for centuries, not out of stigma, but out of profound responsibility toward the unborn.
Sabina Bailauova, a Board Certified Behavior Analyst and Founder and Director of the Algiz Correctional Centers in Atyrau, Kazakhstan, offers a perspective rooted in Kazakh cultural wisdom:
"I am against marriages between first cousins not only as a representative of Kazakh culture, but as someone who believes it is vital to look at this issue through the prism of responsibility toward future generations.
In Kazakh tradition, the question of kinship has always been taken very seriously. The concept of 'Jetti Ata,' knowing seven generations of one's lineage, was not simply a cultural artifact. It was a moral and social compass that defined the boundaries of what was acceptable in matters of family and marriage. Unions between relatives within seven generations were traditionally not welcomed precisely because the lineage was perceived as a unified space of origin, memory, and responsibility.
For me, this carries very deep meaning. Family is not only the feelings of two people. It is also the consequences of their decisions for their children, for subsequent generations, and for the entire lineage. When it comes to marriages between close relatives, one cannot fully separate personal choice from medical responsibility.
From a genetic point of view, close relatives have a higher probability of carrying the same rare recessive genetic variants. If both parents are carriers of the same variant, the risk of certain hereditary diseases in the child increases. Of course, this does not mean that in every such marriage a child with pathology will necessarily be born. But the elevated statistical risk exists, and in my view, it cannot be ignored.
The boundaries of kinship themselves matter to me as well. First cousins remain, above all, part of one family and one lineage. I believe that preserving these boundaries has significance not only for tradition, but for the internal structure of the family, for respect toward one's origins, and for understanding one's place in the genealogical system.
At the same time, I do not consider it right to condemn people or cultures in which different traditions exist. Different societies have historically developed different norms. But respect for cultural differences does not mean abandoning one's own position.
My position is clear enough: I do not support marriages between first cousins. For me, this is not a question of prohibition for prohibition's sake, but of awareness, genetic responsibility, respect for the boundaries of kinship, and care for the next generation.
Perhaps it is precisely for this reason that the ancient Kazakh tradition of 'Jetti Ata' sounds especially modern today. Embedded within it was a simple but powerful thought: in making the decision to create a family, a person is responsible not only for the present, but for those who will come after them." – Sabina Bailauova, Board Certified Behavior Analyst (BCBA). Founder and Director, Algiz Correctional Centers. Atyrau, Kazakhstan
Bailauova's voice matters because it reframes the debate. This is not East versus West. This is not secularism versus tradition. It is a convergence of ancient nomadic wisdom and modern genomic science, arriving at the same threshold and asking the same question: What do we owe the children who have not yet been born?
The legal tide: When governments choose to intervene
Faced with mounting evidence, several governments are moving from education to prohibition.
Norway banned first cousin marriage entirely in 2023, citing public health risks and the goal of preventing forced marriages. Sweden followed suit, with its parliament voting in May 2026 to enact an unconditional ban effective July 1, 2026, which will also end recognition of foreign cousin marriages.
In the United Kingdom, the Marriage (Prohibited Degrees of Relationship) Bill 2025 proposes prohibiting first cousin marriages, though it faces significant human rights and indirect discrimination challenges. In the United States, Congressman Keith Self introduced the Consanguineous Marriage Prohibition Act of 2026, which would deny federal benefit recognition to first cousin marriages.
In Uzbekistan, the Ministry of Justice published draft legislation in December 2025 that would ban marriages between relatives up to the fourth degree of kinship, including first cousins, with penalties including fines and corrective labor for up to two years.
Why bans alone are not the answer
I support evidence-based policy. But I have also sat in enough living rooms to know that prohibition without prevention is performative, not protective.
Banning cousin marriage does not eliminate recessive genes from a population. It does not provide genetic counseling to couples already in love. In cultures where cousin marriage serves critical social functions, such as preserving family wealth, protecting women's safety, and maintaining tribal identity, a ban can drive the practice underground, stigmatize communities, and erode trust in public health institutions.
The Swedish commission itself acknowledged that the public health argument alone was insufficient to justify prohibition, noting that smoking and alcohol carry greater correlations with birth defects. Sweden's ban is framed primarily around combating honor oppression and forced marriage, not genetics.
If we care about outcomes, not optics, we need a different playbook.
What actually works: Screening, counseling, and cultural literacy
The most successful models do not shame tradition, they inform choice within it. Iran operates one of the world's most robust premarital genetic counseling systems. In southern Iran, a study of 2,686 couples found that 85% of those seeking genetic counseling were in consanguineous relationships, and 80% of all referrals were for premarital counseling. This proves that when services are accessible and culturally positioned, families use them.
Saudi Arabia made premarital screening mandatory in 2003. Between 2004 and 2009, the national program for sickle cell anemia and beta thalassemia saw a fivefold increase in voluntary cancellation of high-risk marriages, and the prevalence of thalassemia dropped from 32.9 to 9.0 per 1,000 examined persons. Critically, the program is voluntary in its outcomes. Couples receive information and make their own decisions. That balance of state responsibility and personal autonomy is the key.
In England, community-based models using multilingual health visitors and family-centered genetic services have increased uptake of counseling and testing among at-risk populations. The lesson? Trust is built at the community level, not imposed from above.
A Central Asian blueprint: From data to dignity
Uzbekistan's 1,000 Genomes Project and the Central Asian Genetic Diversity Project have given the region something priceless: a national genetic reference database. Now the question is what to do with it.
Here is what I believe a culturally intelligent, scientifically rigorous Central Asian strategy should look like:
Integrate genetic screening into primary care, not just specialty clinics. Screening must be affordable, routine, and available before engagement, not after pregnancy.
Train community health workers and religious leaders as genetic literacy ambassadors. In societies where imams and elders shape marriage decisions, these voices are more powerful than any government poster.
Make premarital counseling culturally normative, not shameful. Frame it as responsible family planning, akin to checking blood type, rather than a judgment on cousin marriage itself.
Build regional data sharing networks. The Central Asian Genetic Diversity Project (CAGDP) should link with Iran, Saudi Arabia, and Pakistan to create a Central Asian and South Asian genomic consortium. Recessive disorders do not respect borders.
Protect autonomy. Even high-risk couples should be informed, not coerced. The goal is not to control who marries whom. The goal is to ensure every child is born with the healthiest possible genetic start.
The deeper truth
There is a narrative in global health that awareness leads to acceptance, and acceptance leads to action. But we have been aware of the genetic risks of consanguinity for decades, and in too many communities, we have accepted the tradition without acting on the science.
This is not about dismantling family structures. It is about equipping families with the knowledge to protect their children. The siblings I wrote about last month, the silent crisis bearers, deserve to grow up in homes where prevention was possible, not just treatment.
The 1,000 Genomes of Uzbekistan project has shown Central Asia its genetic mirror. The laws being drafted in Tashkent signal political will. The science is clear. The solutions are proven.
What remains is the courage to turn data into policy and policy into practice before another generation pays the price.
Saaid Radwan, Behavior Analyst and Family Consultant
Saaid Radwan is a Behavior Analyst, Neurodiversity and Family Consultant, and CPD Certified Trainer with over 20 years of international experience across the UAE, MENA, Europe, and Central Asia. He specializes in ABA, communication support, emotional regulation, and family-centered care across the lifespan. Saaid is passionate about inclusive education, early intervention, and empowering families and professionals through practical, compassionate strategies. His work bridges evidence-based practice with real-world impact.
