Which statement about the etiology of neural tube defects is most accurate?

Which statement about the etiology of neural tube defects is most accurate?

• A. They are of unknown cause in most cases.
• B. They have a clearly identified single genetic mutation.
• C. They are caused by environmental toxins with high certainty.
• D. They are caused solely by folic acid deficiency in the mother.

Answer: (A)

Neural tube defects arise when the neural tube fails to close early in embryonic development, and their cause is best viewed as multifactorial. For the majority of cases, there isn’t a single identifiable cause. While low folate status and lack of periconceptional folic acid intake increase risk and folate supplementation reduces incidence, many cases occur even with adequate folate. There are genetic susceptibilities and various environmental influences (such as maternal diabetes, obesity, and certain medications), but no one mutation or factor explains most occurrences. This is why the statement that the cause is unknown in most cases is the most accurate.

Neural tube defects arise when the neural tube fails to close early in embryonic development, and their cause is best viewed as multifactorial. For the majority of cases, there isn’t a single identifiable cause. While low folate status and lack of periconceptional folic acid intake increase risk and folate supplementation reduces incidence, many cases occur even with adequate folate. There are genetic susceptibilities and various environmental influences (such as maternal diabetes, obesity, and certain medications), but no one mutation or factor explains most occurrences. This is why the statement that the cause is unknown in most cases is the most accurate.