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ZIC1
Zic family zinc finger 1
The ZIC1 gene provides instructions for making a protein crucial for early embryonic development, particularly in the formation of the brain and spinal cord. ZIC1 is a gene belonging to the Zic family of transcription factors, which are essential for regulating gene expression during embryonic development.
ZIC1 is located on the long (q) arm of chromosome 3, at band 3q24. Arm ratio per GRCh38 - banding schematic.
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Overview
The ZIC1 gene, also known as Zic family zinc finger 1, is a human gene that plays a fundamental role in regulating gene expression during the complex processes of embryonic development. The protein encoded by ZIC1 acts as a transcription factor, meaning it binds to specific DNA sequences to control the activity of other genes. This regulatory function is particularly important for the proper formation and patterning of the central nervous system, including the brain and spinal cord.
Disruptions to the ZIC1 gene can therefore lead to a range of developmental conditions, underscoring its critical involvement in orchestrating healthy embryonic growth. Understanding the ZIC1 gene contributes to a broader knowledge of genetic factors influencing congenital anomalies.
What the gene does
The primary function of the ZIC1 gene is to encode a protein that operates as a transcription factor. This protein binds directly to specific DNA regions, thereby influencing whether other genes are turned 'on' or 'off'. Such precise control over gene expression is fundamental for ordered cell differentiation and tissue formation during foetal development.
In particular, ZIC1's regulatory activities are vital for the development of neural tissues. It participates in establishing the correct patterning of structures derived from the ectoderm, the outermost germ layer in early embryos from which the nervous system originates. The ZIC1 protein features several zinc finger domains, which are crucial for its ability to recognise and bind to DNA. These domains allow the ZIC1 protein to interact with regulatory sequences, modulating developmental pathways that are indispensable for central nervous system formation. Its involvement highlights how gene regulation underpins the intricate processes of embryonic development.
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Chromosome location
The ZIC1 gene is situated on chromosome 3. Specifically, its chromosomal address is 3q24, which denotes its location on the long (q) arm of chromosome 3, within band 24. This genetic address helps pinpoint the gene's position within the human genome and is important for understanding its surrounding genetic landscape and potential interactions with neighbouring genes.
Protein structure
The ZIC1 protein comprises 447 amino acids and is characterised by several key functional domains. It features five C2H2-type zinc finger domains. The C2H2-type 1 (atypical) domain spans amino acids 225-260, followed by C2H2-type 2 (atypical) from amino acids 269-296. A third C2H2-type zinc finger is located at amino acids 302-326, with the fourth from 332-356, and the fifth at 362-384. These zinc finger motifs are critical for the protein's ability to bind DNA and regulate gene transcription. Additionally, the protein contains a disordered region from amino acids 375-431, which may provide flexibility or facilitate interactions with other proteins.
Key variants
Genetic variations, or variants, in the ZIC1 gene can alter the protein's structure or function, potentially impacting its crucial role in embryonic development. These variants can range from single nucleotide changes to larger deletions or duplications within the gene sequence. Depending on where the variant occurs and how it affects the ZIC1 protein, the consequences for development can vary significantly. Some variants may have no noticeable effect, while others can lead to substantial developmental challenges. The clinical impact of a ZIC1 variant is often determined by its specific location and the resulting functional change.
Sample of pathogenic variants
10 pathogenic / likely-pathogenic variants from ClinVar, ranked by review status (expert-panel-reviewed first). This is a sample; recurrent founder variants in a specific population may not appear here - see the full ClinVar listing via the link above.
| Variant (HGVS) | Protein change | Classification | Evidence | Associated condition |
|---|---|---|---|---|
c.1165C>T | p.Gln389Ter | Pathogenic | ★☆☆☆ | not provided |
c.1184_1194del | p.Pro395fs | Pathogenic | ★☆☆☆ | not provided |
c.1204G>T | p.Glu402Ter | Pathogenic | ★☆☆☆ | not provided |
c.1163C>A | p.Ser388Ter | Pathogenic | - | Structural brain anomalies with impaired intellectual development and craniosynostosis |
c.1198G>C | p.Gly400Arg | Pathogenic | - | Craniosynostosis 6 |
c.1214_1215insCACCATCGT | p.Thr405_Pro406insThrIleVal | Pathogenic | - | Structural brain anomalies with impaired intellectual development and craniosynostosis |
c.1101C>A | p.Cys367Ter | Likely pathogenic | ★★☆☆ | Inborn genetic diseases |
c.1042G>A | p.Asp348Asn | Likely pathogenic | ★☆☆☆ | not provided |
c.1117C>A | p.His373Asn | Likely pathogenic | ★☆☆☆ | Structural brain anomalies with impaired intellectual development and craniosynostosis |
c.1130T>C | p.Leu377Pro | Likely pathogenic | ★☆☆☆ | Inborn genetic diseases |
Evidence stars indicate ClinVar review status. Individual variant interpretation should always be performed by a qualified clinical laboratory - many variants remain classified as Variants of Uncertain Significance (VUS) pending more research.
Associated conditions
Variations in the ZIC1 gene have been associated with a spectrum of developmental conditions, primarily affecting the central nervous system. These conditions reflect the gene's critical role in early embryonic patterning and nervous system formation. The specific manifestation of a condition can depend on various factors, including the type and location of the genetic alteration in ZIC1, as well as other genetic and environmental influences.
No disease links recorded for this gene in our reference set.
UK clinical status
The ZIC1 gene is recognised within the UK's National Health Service (NHS) Genomic Medicine Service. It is listed on several clinical panels, indicating its relevance for diagnosing and understanding specific conditions. ZIC1 is included in the DDG2P panel, the Foetal anomalies panel (R21), the Intellectual disability panel (R29), and the Rare syndromic craniosynostosis or isolated multisuture synostosis panel (R100). The green status on these panels signifies that there is strong evidence for the gene's association with these conditions, supporting its use in clinical genetic testing in the UK.
Sources: NHS GMS PanelApp · Genomics England PanelApp · NHS National Genomic Test Directory
Diet & lifestyle considerations
Given the ZIC1 gene's fundamental role in early embryonic development, particularly in the central nervous system, lifestyle considerations primarily relate to general reproductive health. For individuals planning pregnancy, maintaining good overall health, including consuming a balanced diet rich in essential nutrients like folic acid, is generally recommended. Avoiding exposure to known teratogens, such as certain medications, alcohol, and tobacco, during pregnancy is also crucial for healthy foetal development. However, these are general guidelines for reproductive health and not specific interventions targeting ZIC1 gene variants.
Supplement considerations
There is no conclusive evidence to suggest that specific dietary supplements can prevent or treat conditions associated with ZIC1 gene variations. The role of ZIC1 is related to fundamental embryonic patterning, a process not typically influenced by adult supplementation. Individuals with concerns about ZIC1-related conditions or who are considering taking supplements should discuss this with a healthcare professional to ensure safe and appropriate choices.
Frequently asked questions
What does the ZIC1 gene do?
The ZIC1 gene produces a protein vital for embryonic development, primarily acting as a transcription factor. It controls the expression of other genes, which is crucial for the proper formation of the central nervous system, including the brain and spinal cord.
Where is the ZIC1 gene located?
The ZIC1 gene is found on chromosome 3, specifically at position 3q24. This location refers to the long arm of chromosome 3, band 24.
What conditions are associated with ZIC1 gene variants?
Variants in the ZIC1 gene have been linked to various developmental conditions, most notably those affecting the central nervous system, due to its role in early embryonic patterning.
Is ZIC1 included in NHS genetic testing?
Yes, the ZIC1 gene is included in several NHS Genomic Medicine Service clinical panels, such as those for Foetal Anomalies, Intellectual Disability, and Rare Syndromic Craniosynostosis, indicating its established clinical relevance.
Can lifestyle changes affect ZIC1-related conditions?
While general good health practices, such as a balanced diet and avoiding teratogens during pregnancy, are important for foetal development, there are no specific lifestyle interventions known to prevent or treat conditions directly caused by ZIC1 gene variations.