A team of researchers from Oulu University Hospital in Finland conducted a nationwide register study to investigate the link between POI and diagnoses of genetic disorders or congenital malformations.
The causes of POI are highly variable. They can range from autoimmune diseases and medical treatments (iatrogenic causes like chemotherapy) to infections or genetics. As discussed in the last blog, advances in medical science are rapidly changing the diagnostic landscape for POI, making it increasingly evident that genetic factors underpin a large proportion of cases.
The most common genetic causes are related to the X chromosome. Humans typically have 46 chromosomes arranged in 23 pairs. One pair consists of the sex chromosomes (XX for females or XY for males), while the other 22 pairs are autosomes, which carry genes for general body traits. A genetic disorder refers to a health condition caused by an abnormality in a person’s DNA, such as a gene mutation, a missing chromosome, or a duplicated chromosome.
Turner Syndrome
Turner Syndrome is a genetic disorder that affects roughly 1 in 1,700 to 3,000 live female births. Key physical characteristics include short stature and heart disease. Between 5-20% of women with Turner Syndrome will experience spontaneous menarche (their first menstrual period), but more than a third of these individuals will experience loss of ovarian function within five years. There are several genetic variations of Turner Syndrome depending on whether the X chromosome is completely missing or structurally altered. These distinct chromosome patterns are called karyotypes, which include 45,X/46,XX mosaicism or a ring X chromosome.
Fragile X Syndrome
Fragile X Syndrome is a genetic disorder caused by a single-gene mutation on the FMR1 gene located on the X chromosome. While the full syndrome can
A team of researchers from Oulu University Hospital in Finland conducted a nationwide register study to investigate the link between POI and diagnoses of genetic disorders or congenital malformations.
The causes of POI are highly variable. They can range from autoimmune diseases and medical treatments (iatrogenic causes like chemotherapy) to infections or genetics. As discussed in the last blog, advances in medical science are rapidly changing the diagnostic landscape for POI, making it increasingly evident that genetic factors underpin a large proportion of cases.
The most common genetic causes are related to the X chromosome. Humans typically have 46 chromosomes arranged in 23 pairs. One pair consists of the sex chromosomes (XX for females or XY for males), while the other 22 pairs are autosomes, which carry genes for general body traits. A genetic disorder refers to a health condition caused by an abnormality in a person’s DNA, such as a gene mutation, a missing chromosome, or a duplicated chromosome.
Turner Syndrome Turner Syndrome is a genetic disorder that affects roughly 1 in 1,700 to 3,000 live female births. Key physical characteristics include short stature and heart disease. Between 5-20% of women with Turner Syndrome will experience spontaneous menarche (their first menstrual period), but more than a third of these individuals will experience loss of ovarian function within five years. There are several genetic variations of Turner Syndrome depending on whether the X chromosome is completely missing or structurally altered. These distinct chromosome patterns are called karyotypes, which include 45,X/46,XX mosaicism or a ring X chromosome.
Fragile X Syndrome Fragile X Syndrome is a genetic disorder caused by a single-gene mutation on the FMR1 gene located on the X chromosome. While the full syndrome can affect both males and females, women who carry the Fragile X premutation face unique risks: approximately 15% to 24% of them will receive a POI diagnosis.
While other specific genetic disorders account for a much smaller proportion of POI cases, genetic disorders are also closely linked to congenital malformations, which are physical or structural birth defects. The study authors wanted to explore exactly how these genetic disorders, structural birth defects, and POI overlap on a national scale.
The researchers utilised Finland's comprehensive healthcare registries to identify a study group of women with POI. In Finland, women diagnosed with non-surgical POI receive 100% government reimbursement for hormone treatment up until the age of 50. Using this database, the researchers identified 5,011 women diagnosed with non-surgical POI between 1988 and 2017. This POI group was then matched with a healthy control group of women of the same age living in Finland.
Key findings: - Higher Rates of Genetic and Structural Diagnoses: In the POI group, 15.9% of women had at least one genetic disease or congenital malformation diagnosis, compared to just 3.5-9.6% in the healthy control group. - Increased Odds for Turner Syndrome and other genetic disorders: Women with POI were vastly more likely to have Turner Syndrome than the general population. The odds for other sex chromosome abnormalities and autosomal single-gene disorders were also high, even though the total number of individual cases in the data was low. Women with POI had higher odds of physical malformations across almost all organ subgroups. - Age Matters: The younger a woman was when she was diagnosed with POI, the higher her odds were of having an underlying genetic disorder or congenital malformation. - Earliest Diagnoses in Turner Syndrome: The average age for a POI diagnosis was youngest among women with Turner Syndrome, at just 15.9 years old. In fact, 52.6% of the women with Turner Syndrome in this study received their HRT reimbursement right between the ages of 10 and 14. - The Impact of Multiple Diagnoses: The risk of POI increased progressively with the number of genetic or structural diagnoses a woman had. Even when the researchers completely removed Turner Syndrome from the data, the trend remained strong: women with three or more diagnostic codes for genetic or structural conditions had a 10.4 times higher risk of POI.
Taken together, the authors concluded that diagnoses of genetic disorders and congenital malformations are significantly higher in women with POI than in the general population. While Turner Syndrome drives a huge portion of this risk, other genetic conditions play a major role too. The highest risks are seen in individuals presenting with three or more genetic or congenital malformation diagnoses. Furthermore, due to these underlying conditions, women with these diagnoses require hormone treatment at a significantly younger age than the average POI patient.
These findings raise an important clinical question: Should an early-onset POI diagnosis serve as an immediate red flag for doctors to evaluate patients for underlying genetic disorders and hidden structural birth defects?
Turning research into self-advocacy: - The data shows that young women with genetic underpinnings require hormone treatment early; starting it promptly is vital for protecting bone, heart, and brain health - If you have POI and have concerns about underlying genetic causes or associated physical traits, bring this peer-reviewed research to your doctor to start the conversation. - This study proves that POI is often much more than a fertility disorder. It highlights the need for systemic, wide-ranging medical examinations to look at the whole body, not just the ovaries.
Link to paper: https://academic.oup.com/humrep/article/38/6/1224/7109188?guestAccessKey= |