Genetic variant
rs4420638
rs4420638 is a single-letter difference in human DNA, on chromosome 19. 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 rs4420638 is the catalogue number of one of them. Which letters you carry there — one copy from each parent — is your genotype.
Apolipoprotein E ApoE status is technically defined by two different SNPs, rs429358 and rs7412. This...
From SNPedia
Why might it matter?
ClinVar holds no clinical classification for this variant. That is the usual case: most catalogued variants have no known effect on health.
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 rs4420638, 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
- rs4420638
- Position
- chr19:44919689
Genome-wide association studies (20)
| Trait | Risk allele | OR / beta | P-value | Study |
|---|---|---|---|---|
| Apolipoprotein B levels | G | OR 0.27 | 1E-1788 | PubMed |
| Low density lipoprotein cholesterol levels | G | OR 0.22 | 1E-1192 | PubMed |
| C-reactive protein levels | G | OR 0.22 | 3E-1177 | PubMed |
| Total cholesterol levels | G | OR 0.19 | 2E-905 | PubMed |
| C-reactive protein levels | A | OR 0.23 | 1E-305 | PubMed |
| Alzheimer's disease or family history of Alzheimer's disease | G | — | 4E-288 | PubMed |
| C-reactive protein levels or LDL-cholesterol levels (pleiotropy) | A | — | 1E-283 | PubMed |
| C-reactive protein levels or total cholesterol levels (pleiotropy) | A | — | 4E-249 | PubMed |
| Alzheimer's disease | G | — | 2E-202 | PubMed |
| Apolipoprotein A1 levels | G | β 0.095 | 2E-194 | PubMed |
| LDL cholesterol | G | OR 0.23 | 2E-178 | PubMed |
| C-reactive protein levels or triglyceride levels (pleiotropy) | A | — | 2E-171 | PubMed |
| C-reactive protein levels or HDL-cholesterol levels (pleiotropy) | A | — | 2E-164 | PubMed |
| Low density lipoprotein cholesterol levels | A | OR 0.16 | 3E-162 | PubMed |
| Cholesterol, total | G | OR 0.2 | 1E-149 | PubMed |
| Alzheimer's disease | — | OR 3.45 | 8E-149 | PubMed |
| LDL cholesterol | G | OR 7.14 | 9E-147 | PubMed |
| C-reactive protein levels | A | OR 0.24 | 9E-139 | PubMed |
| Total cholesterol levels | A | OR 0.14 | 3E-120 | PubMed |
| Cholesterol, total | G | OR 6.83 | 5E-111 | PubMed |
Sources
- dbSNP: rs4420638 — the reference record
- ClinVar — clinical interpretations submitted by laboratories
- SNPedia — community-written summaries
- GWAS Catalog — association studies