Transient myleoproliferative disorder of the newborn is seen in association with
**Core Concept**
Transient myeloproliferative disorder (TMD) of the newborn is a rare condition characterized by the abnormal proliferation of megakaryocytes and other bone marrow elements, leading to an elevated white blood cell count and platelet count in neonates. This condition is often associated with genetic abnormalities, particularly those involving the GATA1 gene.
**Why the Correct Answer is Right**
TMD of the newborn is most commonly seen in neonates with Down syndrome, who have a deletion on chromosome 21 that affects the GATA1 gene. This gene plays a crucial role in the regulation of hematopoiesis, and its disruption leads to the abnormal proliferation of megakaryocytes and other bone marrow elements. The GATA1 gene is involved in the early stages of megakaryocyte development, and its mutation leads to the overproduction of platelets and white blood cells.
**Why Each Wrong Option is Incorrect**
**Option A:** While TMD can be seen in other genetic syndromes, it is not typically associated with Turner syndrome.
**Option B:** Klinefelter syndrome is a genetic disorder characterized by an extra X chromosome in males, but it is not commonly associated with TMD.
**Option C:** Cytomegalovirus (CMV) infection can cause a variety of hematologic abnormalities in neonates, but it is not typically associated with TMD.
**Clinical Pearl / High-Yield Fact**
It is essential to recognize the association between TMD and Down syndrome, as this condition can have significant implications for the management and prognosis of affected neonates.
**Correct Answer:** D. Down syndrome