Genetic variant
rs2143756208 a variant in the ZNF668 gene
rs2143756208 is a single-letter difference in the ZNF668 gene, on chromosome 16. ClinVar, the public archive of variant interpretations, lists it as pathogenic: able to cause or contribute to disease. It has been reported in connection with marked facial dysmorphism and Profound global developmental delay, among others. Carrying it does not, on its own, mean you have or will develop any condition.
What is this?
Your DNA is a long sequence of four letters. At a few million positions, people commonly differ by a single letter; each of those positions is called a SNP (“snip”), and rs2143756208 is the catalogue number of one of them, in the ZNF668 gene. Which letters you carry there — one copy from each parent — is your genotype.
ZNF668 (zinc finger protein 668): Predicted to enable DNA-binding transcription repressor activity, RNA polymerase II-specific; RNA polymerase II cis-regulatory region sequence-specific DNA binding activity; and zinc ion binding activity. Involved in DNA repair. Predicted to be active in nucleus. [provided by Alliance of Genome Resources, Jul 2025]
Gene description from NCBI Gene
Why might it matter?
ClinVar records this variant as pathogenic, meaning able to cause or contribute to disease. A classification describes the variant, not you: what it means for one person depends on their genotype, their family history and often on other genes and circumstances.
Conditions it has been reported with
- marked facial dysmorphism
- Profound global developmental delay
- Progressive microcephaly
- Failure to thrive
- Severe short-limb dwarfism
- Neurodevelopmental disorder with poor growth, large ears, and dysmorphic facies, marked facial dysmorphism
- Neurodevelopmental disorder with poor growth, large ears, and dysmorphic facies
Listed in ClinVar submissions for this variant. Being listed is a report of an association, not a statement that the variant causes the condition in any given person.
Do I have this variant?
If you have taken a consumer DNA test (23andMe, AncestryDNA and similar), you can download its raw data file and check. Create a free account, upload the file, and this page will show the letters you carry at rs2143756208, if your test read this position.
Connect this with your blood results
A gene is a fixed instruction; a blood test shows what your body is doing now. CheckMyBloods reads the two side by side, so a variant can be set against the markers it could plausibly affect.
Blood markers do not diagnose a genetic condition, and a variant does not explain a blood result on its own. Together, with symptoms and family history, they give a clinician context.
What should I do next?
- Find out whether you carry it. Reading about a variant says nothing about you until you know your genotype.
- Put it in context. Add your blood results, so the variant can be read against what your body is doing.
- Ask questions. Dr. Hemsworth, our AI assistant, can explain this variant and your results in plain English.
- Take anything that worries you to a professional. A GP or genetic counsellor can order a confirmatory test and interpret it with your history.
This page is general information drawn from public research databases. It cannot diagnose anything, and it is not a substitute for advice from a doctor or genetic counsellor who knows your history.
Technical details
- dbSNP ID
- rs2143756208
- Gene
- ZNF668
- Position
- chr16:31061973
- ClinVar classification
- Pathogenic
Sources
- dbSNP: rs2143756208 — the reference record
- ClinVar — clinical interpretations submitted by laboratories
- SNPedia — community-written summaries
- NCBI Gene: ZNF668
- Ensembl: ZNF668