Variant
ACVRL1 Q490X
NM_000020.3(ACVRL1):c.1468C>T (p.Gln490Ter)
- p.Gln490*
- p.Gln490Ter
- p.Q490*
- rs1085307429
- ClinVar classification
- Pathogenic
- Review status
- 3 stars out of 4reviewed by expert panel
- Last evaluated
- 15 March 2024
- Expert panel
- ClinGen Hereditary Hemorrhagic Telangiectasia Variant Curation Expert Panel, ClinGen
Data current to ClinVar release 2026-10-12 · Dante Labs data release 2026.10.16-c6eea6bfFacts last changed 16 October 2026
Reference genomeGRCh38hg38
Positions on gene and variant pages follow this choice, in this browser.
Summary
Q490X is a nonsense variant in ACVRL1: it creates an early stop signal, so the protein the gene encodes is predicted to be cut short. ClinVar classifies it as pathogenic for Telangiectasia, Hereditary Hemorrhagic, Type 2 (reviewed by expert panel).
ClinVar classifications
| Condition | Classification | Review status | Submissions | Last evaluated |
|---|---|---|---|---|
| Telangiectasia, Hereditary Hemorrhagic, Type 2ClinVar VCV000426040 (opens in a new tab) | Pathogenic | 3 stars out of 4reviewed by expert panel | 1 submission | 15 March 2024 |
Classifications as ClinVar records them in release 2026-10-12. ClinVar updates them as evidence is reviewed.
Where it lies in ACVRL1
Q490X lies in exon 10 of the 10 in ACVRL1's MANE Select transcript, NM_000020.3.
Molecular details
| Gene | ACVRL1 |
|---|---|
| Transcript | NM_000020.3MANE Select |
| Coding DNA change (HGVS c.) | c.1468C>T |
| Protein change (HGVS p.) | p.Gln490Terp.Q490* |
| Predicted consequence | Nonsense (stop gained)stop_gained (opens in a new tab) |
| Predicted impact | High |
| Position (GRCh38) | chr12:51920849 C>T |
| Position (GRCh37) | chr12:52314633 C>T |
| dbSNP ID | rs1085307429 (opens in a new tab) |
| ClinVar Variation ID | VCV000426040 (opens in a new tab) |
| ClinVar Allele ID | 414411 |
| ClinGen Allele Registry ID | CA384906013 (opens in a new tab) |
| ClinVar name | NM_000020.3(ACVRL1):c.1468C>T (p.Gln490Ter) |
| Other names | p.Gln490* |
ACVRL1 Q490X in other databases
Reports that look at this variant (1)
These Genome Test condition reports include Q490X among the variants they look at.
| Report | Conditions | Inheritance |
|---|---|---|
| Hereditary Hemorrhagic Telangiectasia | Hereditary Hemorrhagic Telangiectasia | Autosomal dominant |
| Telangiectasia, Hereditary Hemorrhagic, Type 2 | Autosomal dominant | |
| Telangiectasis |
Other variants in ACVRL1
- C46SLikely pathogenic3 stars out of 4
- C51GLikely pathogenic3 stars out of 4
- C89FLikely pathogenic3 stars out of 4
- C207Lfs*51Pathogenic3 stars out of 4
- E236KPathogenic3 stars out of 4
- H328YLikely pathogenic3 stars out of 4
- N98SLikely pathogenic3 stars out of 4
- R411QPathogenic3 stars out of 4
- S186ILikely pathogenic3 stars out of 4
- S333IPathogenic3 stars out of 4
Limitations
This page describes publicly available information about a genetic variant. It is not a diagnosis, and it says nothing about whether you or anyone else carries this variant.
Classifications come from ClinVar and change as new evidence is reviewed. A classification here may differ from the one in ClinVar today, or from the one a laboratory reports.
Whole genome sequencing with short reads can miss or miscall some variants, particularly in repeated or highly similar stretches of DNA and in large insertions, deletions or rearrangements.
If you have questions about a variant in your own results or in your family, talk to a genetic counsellor or your doctor.
Sources & credits
- Classifications from ClinVar (release 2026-10-12), National Center for Biotechnology Information.
- Condition terms from the Mondo Disease Ontology (release 2026-10-06), used under CC BY 4.0.
- Gene symbols and names from the HUGO Gene Nomenclature Committee (release 2026-10-16).
- Allele identifiers from the ClinGen Allele Registry (release 2026-10-16-c4908f54).
- Reference SNP identifiers from dbSNP (release b157), National Center for Biotechnology Information.
- Gene–disease links from the Gene Curation Coalition, GenCC (release 2026-10-16).
- Difficult regions from the Genome in a Bottle Consortium (release v3.6).
- Transcripts from MANE (release v1.5), NCBI and EMBL-EBI.
- Predicted consequences from mehari (release 0.11.0), with transcript models from cdot.
- Built from Dante Labs data release 2026.10.16-c6eea6bf of 16 October 2026.
Cite this page
Dante Labs. (16 October 2026). ACVRL1 Q490X (c.1468C>T, rs1085307429) (Version 2026.10.16-c6eea6bf). Retrieved 16 October 2026, from https://dantelabs.com/genes/acvrl1/variants/q490x
Dante Labs. ACVRL1 Q490X (c.1468C>T, rs1085307429) [Internet]. Version 2026.10.16-c6eea6bf. 16 October 2026 [cited 16 October 2026]. Available from: https://dantelabs.com/genes/acvrl1/variants/q490x
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