rs776746 a variant in the CYP3A5 gene

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 rs776746 is the catalogue number of one of them, in the CYP3A5 gene. Which letters you carry there — one copy from each parent — is your genotype.

CYP3A5 (cytochrome P450 family 3 subfamily A member 5): This gene encodes a member of the cytochrome P450 superfamily of enzymes. The cytochrome P450 proteins are monooxygenases which catalyze many reactions involved in drug metabolism and synthesis of cholesterol, steroids and other lipids. The encoded protein metabolizes drugs as well as the steroid hormones testosterone and progesterone. This gene is part of a cluster of cytochrome P450 genes on chromosome 7q21.1.

Gene description from NCBI Gene

Why might it matter?

ClinVar records this variant as drug response, meaning linked to how the body handles certain medicines. 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

• Hypertension, salt-sensitive essential, susceptibility to
• Tacrolimus response, refractory myasthenia gravis

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?

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?

1. Find out whether you carry it. Reading about a variant says nothing about you until you know your genotype.
2. Put it in context. Add your blood results, so the variant can be read against what your body is doing.
3. Ask questions. Dr. Hemsworth, our AI assistant, can explain this variant and your results in plain English.
4. 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

rs776746

Gene

CYP3A5

Position (GRCh38)

chr7:99672915

Variant type

snv

Consequence

intron variant

ClinVar classification

association; drug response; risk factor

Genome-wide association studies (13)

How common the less frequent letter is

gnomAD ALL

9.8%

1kG AFR

82%

1kG ALL

62.1%

1kG AMR

79.7%

1kG EAS

71.3%

1kG EUR

5.7%

1kG SAS

66.8%

Sources

• dbSNP: rs776746 — the reference record
• ClinVar — clinical interpretations submitted by laboratories
• SNPedia — community-written summaries
• NCBI Gene: CYP3A5
• Ensembl: CYP3A5
• GWAS Catalog — association studies

Related

• The CYP3A5 gene
• SNP explorer
• Gene directory
• Health conditions