WNT1

Quality 0.50 · 1 view · Updated 2 months ago

Protein-coding gene in animals

title: "WNT1" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public description: "Protein-coding gene in animals" topic_path: "uncategorized" source: "https://en.wikipedia.org/wiki/WNT1" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Protein-coding gene in animals ::

WNT1 is a gene that encodes the WNT1 protein. It is a proto-oncogene involved in regulating embryonic development and is highly conserved among animals. WNT1 was previously known as INT1 in mammals and Wg (or "wingless") in Drosophila. In 1987, it was discovered that they were the same gene (i.e. they were homologous), and the gene was subsequently renamed WNT1 as a portmanteau of wingless and int-1.

The WNT gene family consists of structurally related genes that encode secreted signaling proteins. These proteins have been implicated in oncogenesis and in several developmental processes, including regulation of cell fate and patterning during embryogenesis. This gene is a member of the WNT gene family. It is very conserved in evolution, and the protein encoded by this gene is known to be 98% identical to the mouse Wnt1 protein at the amino acid level. The studies in mouse indicate that the Wnt1 protein functions in the induction of the mesencephalon and cerebellum.

Gene

This gene is clustered with another family member, WNT10B, in the chromosome 12q13 region.

Structure

The WNT1 protein is a secreted glycoprotein, typically composed of approximately 343 amino acids after cleavage of a precursor peptide. It belongs to the Wnt family, which is characterized by several unique structural features. WNT1 displays a highly conserved primary structure, notably containing 22–24 conserved cysteine residues critical for multiple intramolecular disulfide bonds that stabilize a complex, folded conformation.

Wnt proteins exhibit a two-domain organization: an N-terminal domain rich in alpha-helices stabilized by disulfide bridges, and a C-terminal domain dominated by beta-sheets, also supported by disulfide bonds. This overall folding pattern is unique among known protein structures. The protein is highly hydrophobic, a property related to post-translational lipid modifications, particularly palmitoleic acid addition at conserved serine residues, which is essential for functional interaction with Frizzled family receptors. WNT1 has a globular configuration with distinct "thumb" and "index finger" regions that engage specific receptor domains, facilitating canonical and non-canonical Wnt signaling. The mature WNT1 protein is glycosylated and forms complexes with Frizzled receptors, initiating developmental and oncogenic signaling cascades.

Function

WNT1 is a secreted glycoprotein that plays an important role in regulating embryonic development and adult tissue homeostasis, primarily through its function as a morphogen and signaling molecule. As a canonical Wnt ligand, WNT1 activates the Wnt/β-catenin pathway by binding to Frizzled and LRP5/LRP6 receptors, leading to the stabilization and nuclear translocation of beta-catenin. This activation facilitates the transcription of genes crucial for cell proliferation, survival, differentiation, and migration. In development, WNT1 is essential for proper patterning and proliferation of neural progenitor cells, particularly influencing midbrain and hindbrain formation, neural crest cell expansion, and dopaminergic neuron development. In adult tissues, WNT1-mediated signaling contributes to stem cell maintenance and tissue repair.

Aberrant WNT1 activation is strongly implicated in oncogenesis. Elevated WNT1 signaling can disrupt normal cell adhesion, promote uncontrolled proliferation, and contribute to tumor initiation and progression by upregulating oncogenic targets such as c-Myc and cyclin D1. It also influences tumor immune evasion and metastasis in several cancer types, making WNT1 a significant target for potential cancer therapeutics.

Clinical significance

The WNT1 gene has notable clinical significance due to its role in both inherited bone disorders and cancer biology. Pathogenic variants in WNT1 are recognized as a cause of osteogenesis imperfecta (OI) and early-onset osteoporosis (EOOP), with homozygous mutations typically leading to severe, life-threatening bone fragility, while heterozygous mutations can result in milder phenotypes such as reduced bone mass or early fractures without significant deformity. WNT1 is crucial for normal skeletal development and bone homeostasis, and impairment of its function disrupts osteoblastogenesis via the Wnt/β-Catenin signaling pathway, leading to compromised bone strength. In oncology, overexpression of WNT1 has been identified in non-small cell lung cancer (NSCLC) and correlates with increased tumor proliferation, angiogenesis, and a poorer prognosis. Its status has been shown to serve as a significant independent prognostic factor in NSCLC, likely through the upregulation of proliferation-related target genes such as c-Myc.

History

The WNT1 gene name derives its name from the fusion of two earlier gene discoveries: wingless (wg) in Drosophila melanogaster and int-1 in mice. The wingless gene, identified through mutagenesis screens in the 1970s, was found to be critical for segment polarity in fly embryos, a discovery that contributed to the 1995 Nobel Prize in Physiology or Medicine to Edward B. Lewis, Christiane Nüsslein-Volhard and Eric F. Wieschaus. Independently, int-1 was discovered as a common integration site for mouse mammary tumor virus (MMTV) and shown to induce tumors, work that was part of the oncogene research recognized by the 1989 Nobel Prize to J. Michael Bishop and Harold E. Varmus.

Later, int-1 was found to be the mammalian ortholog of wingless, linking developmental biology and cancer research. To unify and standardize the growing list of orthologs and paralogs, scientists proposed the name Wnt as a portmanteau of wingless and int-1—with Wnt1 becoming the founding member of this conserved gene family.

References

References

  1. (November 1985). "The nucleotide sequence of the human int-1 mammary oncogene; evolutionary conservation of coding and non-coding sequences". The EMBO Journal.
  2. (May 1988). "Chromosome localization of the human oncogene INT1 to 12q13 by in situ hybridization". Cytogenetics and Cell Genetics.
  3. (May 2008). "Wnt signalling and its impact on development and cancer". Nature Reviews. Cancer.
  4. "Dmel\wg".
  5. (August 1987). "The Drosophila homolog of the mouse mammary oncogene int-1 is identical to the segment polarity gene wingless". Cell.
  6. "Entrez Gene: WNT1 wingless-type MMTV integration site family, member 1".
  7. (September 2012). "Wnt proteins". Cold Spring Harbor Perspectives in Biology.
  8. (June 2014). "Disulfide bond requirements for active Wnt ligands". The Journal of Biological Chemistry.
  9. (April 2013). "Lipid modification in Wnt structure and function". Current Opinion in Lipidology.
  10. (January 2022). "Wnt/β-catenin signalling: function, biological mechanisms, and therapeutic opportunities". Signal Transduction and Targeted Therapy.
  11. (October 2020). "Wnt Pathway: An Integral Hub for Developmental and Oncogenic Signaling Networks". International Journal of Molecular Sciences.
  12. (May 2004). "Effects of Wnt1 signaling on proliferation in the developing mid-/hindbrain region". Molecular and Cellular Neurosciences.
  13. (June 2000). "Roles of Wnt proteins in neural development and maintenance". Current Opinion in Neurobiology.
  14. (July 2024). "Wnt signaling and tumors (Review)". Molecular and Clinical Oncology.
  15. (2006). "Wnt-1 signal as a potential cancer therapeutic target". Drug News & Perspectives.
  16. (July 2023). "WNT ligands in non-small cell lung cancer: from pathogenesis to clinical practice". Discover Oncology.
  17. (August 2016). "Prognostic value of wingless-type proteins in non-small cell lung cancer patients: a meta-analysis". Translational Lung Cancer Research.
  18. (June 2022). "Wnt signaling pathway: A comprehensive review". Cell Biology International.
  19. (September 2023). "MYC and non-small cell lung cancer: A comprehensive review.". Human Gene.
  20. "The Nobel Prize in Physiology or Medicine 1995 - Press release". NobelPrize.org.
  21. (9 October 1989). "The Nobel Prize in Physiology or Medicine 1989 - Press release". NobelPrize.org.
  22. (October 1989). "Cancer gene research wins medicine Nobel". Science.
  23. (2025). "One Wnt to lead them all: a Wnt1 primer". Differentiation; Research in Biological Diversity.

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::