Mothers with phenylketonuria (PKU) are at increased risk of having children with
**Core Concept**
Phenylketonuria (PKU) is a genetic disorder caused by a deficiency of the enzyme phenylalanine hydroxylase (PAH), leading to the accumulation of phenylalanine (Phe) in the body. This condition requires a strict diet to prevent neurological damage and developmental issues.
**Why the Correct Answer is Right**
In mothers with PKU, high levels of phenylalanine can be transferred to the fetus through the placenta, leading to fetal exposure and potential harm. This is particularly concerning during pregnancy, as it can cause congenital heart defects, developmental delays, and other complications. The risk of having a child with these issues is significantly increased in mothers with untreated or poorly managed PKU.
**Why Each Wrong Option is Incorrect**
**Option A:** Microcephaly - While microcephaly can be associated with various genetic disorders, it is not the most direct consequence of maternal PKU.
**Option B:** Cleft palate - Cleft palate is a separate congenital anomaly that is not directly linked to maternal PKU.
**Option C:** Neural tube defects - Although neural tube defects can be related to folic acid deficiency, they are not the primary concern in mothers with PKU.
**Clinical Pearl / High-Yield Fact**
Maternal PKU can also lead to pregnancy complications, such as preterm labor, low birth weight, and placental insufficiency. It's essential for women with PKU to maintain a strict diet before and during pregnancy to minimize these risks.
**Correct Answer:** C. Developmental delays.