ZIC3

Overview

ZIC3 (Zic family member 3) encodes a zinc-finger transcription factor with key roles in early embryogenesis, neural development, and left-right axis specification. In cancer genomics, ZIC3 is among the most under-expressed developmental genes in extra-cranial malignant rhabdoid tumors (MRT) relative to human embryonic stem cells and fetal cerebellum, suggesting it is silenced as part of the developmental arrest program imposed by SMARCB1 loss.

Alterations observed in the corpus

  • Among the most under-expressed developmental genes vs hESC and fetal cerebellum in extra-cranial MRT with SMARCB1 biallelic inactivation PMID:26977886
  • Overexpressed in medulloblastoma (MBL) alongside PTCH1 and SUFU; identified as part of a Hedgehog-pathway activation signature making tumors potential SMO-inhibitor targets PMID:28007021

Cancer types (linked)

  • Malignant rhabdoid tumor (MRT): ZIC3 is markedly under-expressed relative to developmental reference tissues, consistent with the transcriptional arrest imposed by SMARCB1 loss PMID:26977886

Co-occurrence and mutual exclusivity

Therapeutic relevance

  • No direct therapeutic relevance established; under-expression is hypothesis-generating for developmental pathway dependencies in MRT PMID:26977886

Open questions

  • Whether ZIC3 silencing is a direct downstream consequence of SMARCB1 loss-mediated chromatin remodeling or reflects a broader developmental arrest program is unresolved PMID:26977886

Sources

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