SIX3
protein-coding gene in the species Homo sapiens
Homeobox protein SIX3 is a protein that in humans is encoded by the SIX3 gene.
Function
The SIX homeobox 3 (SIX3) gene is crucial in embryonic development by providing necessary instructions for the formation of the forebrain and eye development. SIX3 is a transcription factor that binds to specific DNA sequences, controlling whether the gene is active or inactive. Activity of the SIX3 gene represses Wnt1 gene activity which ensures development of the forebrain and establishes the proper anterior posterior identity in the mammalian brain. By blocking Wnt1 activity, SIX3 is able to prevent abnormal expansion of the posterior portion of the brain into the anterior brain area.
During retinal development, SIX3 has been proven to hold a key responsibility in the activation of Pax6, the master regulator of eye development. Furthermore, SIX3 assumes its activity in the PLE (presumptive lens ectoderm), the region in which the lens is expected to develop. If its presence is removed from this region, the lens fails to thicken and construct itself to its proper morphological state. Also, SIX3 plays a strategic role in the activation of SOX2.
SIX3 has also been proven to play a role in repression of selected members of the Wnt family.
The public source identifies “SIX3” as protein-coding gene in the species Homo sapiens. This brief keeps that definition visible, then builds a research path around SIX3, protein-coding and gene.
Why this record matters
A short description can identify a subject without explaining its stakes. For “SIX3”, the useful work is to connect “protein-coding gene in the species Homo sapiens” to the records capable of establishing context and consequence.
The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Nov 13, 2025. The linked authority identifier is Q18031510. None of the 0 selected statements returned an explicit reference.
Scientific names, classifications and consensus can change while older terminology persists in catalogues and historical literature. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Check terminology, classification and the date of the cited evidence. Scientific names and technical consensus can change while older records retain historical value.
- Current terminology
- Classification context
- Finding cited technical literature
Primary datasets, specimen catalogues, standards bodies and the most recent peer-reviewed literature.
Three-step research path
- Establish the record: confirm the title “SIX3”, its source revision and the description used here.
- Expand the search: follow SIX3 primary sources, SIX3 archive and SIX3 research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “SIX3”?
- Has classification or technical consensus changed since the cited source?
- Which observation, specimen, dataset or publication supports the account?
Search terms from this dossier
This entry incorporates text from “SIX3” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.