Reading the record for CYB5R2 from HGNC, NCBI Gene and Ensembl.Still reading. A first read of a gene can take a while; this page waits up to 115 seconds for it, and its scripts then bring in the page, or a line saying what did not arrive.
The full name, the identifiers, the location and the notes from the sources arrive with the record. Nothing is filled in ahead of it.
Order door
The door to order for CYB5R2 opens with the record, which decides which product it carries. The order page itself is open now.
Cytogenetic band 11p15.4NCBI: 11:7,665,095-7,674,267 on the minus strand, GRCh38.p14 (GCF_000001405.40), sequence NC_000011.10, annotation GCF_000001405.40-RS_2025_08 of 2025-08-01Ensembl: 11:7,662,865-7,677,222 on the minus strand, GRCh38.p14 (GCA_000001405.29), release 116Coordinates are one-based with both ends included, as each source reports them.
The protein encoded by this gene belongs to the flavoprotein pyridine…
NCBI Gene summary
Ready in a moment
Reading NCBI Gene and UniProt.Still reading. A first read of a gene can take a while; this page waits up to 30 seconds for it, and its scripts then bring in the panel, or a line saying what did not arrive.
02 / Transcripts and isoforms
The RNA a design targets
10 RefSeq and 44 Ensembl transcripts on GRCh38.p14; MANE Select NM_016229.5.
NCBI Datasets · Ensembl
Ready in a moment
Reading NCBI Datasets and Ensembl.Still reading. A first read of a gene can take a while; this page waits up to 80 seconds for it, and its scripts then bring in the panel, or a line saying what did not arrive.
03 / Expression by tissue
Where CYB5R2 is expressed
Reading GTEx and the Human Protein Atlas.Still reading. A first read of a gene can take a while; this page waits up to 80 seconds for it, and its scripts then bring in this line, or a line saying what did not arrive.
Ready in a moment
04 / Protein
The protein CYB5R2 encodes
Reading UniProt, InterPro, AlphaFold DB and PDBe.Still reading. A first read of a gene can take a while; this page waits up to 80 seconds for it, and its scripts then bring in this line, or a line saying what did not arrive.
Ready in a moment
05 / Interactions
Proteins STRING associates with CYB5R2
The 25 highest-scoring STRING partners at or above a combined score of 0.4, of up to 25 asked for; CYB5B, CYB5A, SUOX lead.
STRING v12.0
Ready in a moment
06 / Pathways
Where CYB5R2 acts, as Reactome curates it
Reading UniProt and Reactome.Still reading. A first read of a gene can take a while; this page waits up to 60 seconds for it, and its scripts then bring in this line, or a line saying what did not arrive.
Ready in a moment
07 / Disease associations
Diseases linked to CYB5R2
Reading Open Targets and ClinGen.Still reading. A first read of a gene can take a while; this page waits up to 105 seconds for it, and its scripts then bring in this line, or a line saying what did not arrive.
Ready in a moment
08 / Variants
Classified variants of CYB5R2
Reading ClinVar.Still reading. A first read of a gene can take a while; this page waits up to 60 seconds for it, and its scripts then bring in this line, or a line saying what did not arrive.
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09 / Constraint
How much variation CYB5R2 tolerates
Reading gnomAD and Open Targets.Still reading. A first read of a gene can take a while; this page waits up to 45 seconds for it, and its scripts then bring in this line, or a line saying what did not arrive.
Ready in a moment
10 / Orthologs
The same gene in mouse, rat and human
Reading the Alliance, NCBI, Ensembl Compara and RGD.Still reading. A first read of a gene can take a while; this page waits up to 145 seconds for it, and its scripts then bring in this line, or a line saying what did not arrive.
Ready in a moment
11 /MicroRNAs
MicroRNAs hosted within CYB5R2
No annotated microRNA lies within CYB5R2 in Ensembl release 116, on GRCh38.p14.
Ensembl · miRBase
Ready in a moment
12 / Long non-coding RNAs
Long non-coding RNAs at the CYB5R2 locus
No annotated long non-coding RNA overlaps CYB5R2 in Ensembl release 116, on GRCh38.p14.
Ensembl
Ready in a moment
13 / Literature
Papers that mention CYB5R2
Reading Europe PMC.Still reading. A first read of a gene can take a while; this page waits up to 55 seconds for it, and its scripts then bring in this line, or a line saying what did not arrive.
Ready in a moment
14 / Silencing this gene
From CYB5R2 to a sequence that silences it
The AUMsilence™ platform designs the sequences against the human transcripts on this page. Six decisions are yours before it does. What is written under each is AUM's guidance; the timings and the concentrations are in the usage guide below.
01
Choose the region
A knockdown oligonucleotide can sit in the 5' untranslated region, the coding sequence or the 3' untranslated region, and all three are used. The coding sequence and the 3' untranslated region are the usual first choices for an RNase H design; the 5' end near the start codon suits a steric block. The map above shows where each region sits on the isoforms it draws.
02
Cover the isoforms you mean
An exon every isoform carries silences the whole gene; an exon only some isoforms carry silences those and spares the rest. Decide which you want before a sequence is chosen, and check the reference transcript (MANE Select in human; RefSeq Select and Ensembl canonical in mouse and rat) is the one your cells express.
03
Think across species early
The orthologs panel says whether mouse and rat carry the same gene. Whether one oligonucleotide can serve two species is a sequence question, settled at design by matching the candidate against each transcript, not by the protein identity shown there.
04
Check expression in your model
A transcript that is not expressed in your cells cannot show knockdown. Confirm the gene is expressed in the cell type and condition you will use, from your own data or a reference atlas, before the order. The expression panel above gives GTEx's median per tissue for a human gene; for mouse and rat it says that no atlas is on this page yet.
05
Run the controls
A scramble control of the same chemistry, a positive control against a gene known to knock down in your cells, untreated cells, and a mock condition where a transfection reagent is used. Read knockdown at the RNA level first, then at the protein; the usage guide gives the timing and the concentrations to start from.
06
Pick the product
AUMsilence sdASO needs no transfection reagent and works in the cells that resist one. AUMsilence toASO is the transfection-optimised version of the same design, and AUMsiRNA™ is the siRNA route. The selection guide compares them.
For research use only. Not for use in diagnostic or therapeutic procedures.
Gene summary
The protein encoded by this gene belongs to the flavoprotein pyridine nucleotide cytochrome reductase family of proteins. Cytochrome b-type NAD(P)H oxidoreductases are implicated in many processes including cholesterol biosynthesis, fatty acid desaturation and elongation, and respiratory burst in neutrophils and macrophages. Cytochrome b5 reductases have soluble and membrane-bound forms that are the product of alternative splicing. In animal cells, the membrane-bound form binds to the endoplasmic reticulum, where it is a member of a fatty acid desaturation complex. Alternative splicing results in multiple transcript variants.
Provided by RefSeq, Nov 2014, through NCBI Gene. NCBI disclaimer
NADH-cytochrome b5 reductases are involved in desaturation and elongation of fatty acids, cholesterol biosynthesis, drug metabolism, and, in erythrocyte, methemoglobin reduction (By similarity). Responsible for NADH-dependent lucigenin chemiluminescence in spermatozoa by reducing both lucigenin and 2-[4-iodophenyl]-3-[4-nitrophenyl]-5-[2,4-disulfophenyl]-2H tetrazolium monosodium salt (WST-1)
NCBI Gene summary · NCBI Gene annotation RS_2025_08 · read · NCBI Gene 51700Data from NCBI, provided as is; NCBI's policies and disclaimers apply.
UniProtKB function · 2026_03 · read · UniProt Q6BCY4UniProt data are available under the Creative Commons Attribution 4.0 licence.
Placed on GRCh38.p14 (GCF_000001405.40). MANE Select marks the one transcript RefSeq and Ensembl agree is the reference for this gene.
RefSeq 10 transcripts
coding sequence, tall
untranslated region, thin
non-coding exon
intron, fixed width
Genomic strand: minus. Drawn 5' to 3', so exon 1 sits at the left here and at the highest coordinate on the chromosome.
NM_016229.5NM_016229.5MANE Select
NM_001302826.2NM_001302826.2
XM_047427124.1XM_047427124.1
XM_006718251.4XM_006718251.4
XM_011520184.3XM_011520184.3
XM_024448580.2XM_024448580.2
NM_001302827.1NM_001302827.1
XM_047427125.1XM_047427125.1
XM_011520185.4XM_011520185.4
NR_126508.2NR_126508.2
scale
Drawn 5' to 3' from each transcript's exons as placed on the reference assembly; exon 1 is the 5' exon on the transcript's own strand. Exon blocks are to scale with each other; introns are drawn at one fixed width whatever their length, so the map is not to scale along the chromosome. Numbers are exon ranks along the strand; a rank is omitted where the exon is too narrow to carry it.
A window on one transcript
One pixel of the map above stands for several bases, and a block too short to see is drawn wider than its own scale, so the map chooses a region and the sequence here chooses the window. Click an exon on a row of the map, or drag across a row; then set the exact start and end below.
These controls are ready in a moment.
No transcript is chosen.
Once a window is chosen this panel shows its length, its G and C count as a percentage of that length, the letters it is made of, the exons it falls in, whether it crosses a junction, and its antisense strand.
Not listed, because the source places them on another assembly only: XM_054369122.1 (not placed on GRCh38.p14); XM_054369123.1 (not placed on GRCh38.p14); XM_054369124.1 (not placed on GRCh38.p14); XM_054369125.1 (not placed on GRCh38.p14); XM_054369126.1 (not placed on GRCh38.p14).
NCBI Datasets, RefSeq transcripts · NCBI Datasets 18.38.0; GCF_000001405.40-RS_2025_08 · read · NCBI Gene 51700Data from NCBI, provided as is; NCBI's policies and disclaimers apply.
Ensembl 44 transcripts
coding sequence, tall
untranslated region, thin
non-coding exon
intron, fixed width
Genomic strand: minus. Drawn 5' to 3', so exon 1 sits at the left here and at the highest coordinate on the chromosome.
Drawn 5' to 3' from each transcript's exons as placed on the reference assembly; exon 1 is the 5' exon on the transcript's own strand. Exon blocks are to scale with each other; introns are drawn at one fixed width whatever their length, so the map is not to scale along the chromosome. Numbers are exon ranks along the strand; a rank is omitted where the exon is too narrow to carry it.
A window on one transcript
One pixel of the map above stands for several bases, and a block too short to see is drawn wider than its own scale, so the map chooses a region and the sequence here chooses the window. Click an exon on a row of the map, or drag across a row; then set the exact start and end below.
These controls are ready in a moment.
No transcript is chosen.
Once a window is chosen this panel shows its length, its G and C count as a percentage of that length, the letters it is made of, the exons it falls in, whether it crosses a junction, and its antisense strand.
Lengths are spliced lengths, as each source states them. Exon ranks follow the strand: on a minus-strand gene exon 1 has the highest genomic coordinate. Reference assembly for human: GRCh38.
54 GTEx tissues; the highest median in Testis, 185 TPM.
GTEx
309 PubMed-indexed papers mention CYB5R2 at Europe PMC, newest first. Europe PMC ignores letter case, so the count also covers another species' symbol spelled with the same letters.
Europe PMC
Mouse Cyb5r2 by 3 of 3 votes; rat Cyb5r2 by 3 of 3 votes. RGD is not answering, so the ortholog list could not be shown. Try again later. Reference 7b864fc0-ed7.
Alliance · NCBI · Ensembl Compara
1 curated, 0 inferred Reactome pathways for Q6BCY4 in human, v97.
Reactome
pLI below 0.0001 and LOEUF 1.56 in gnomAD v4 (GRCh38), on ENST00000299498.11.
gnomAD
74 Open Targets disease associations; familial hemolytic anemia first, at 0.24.
Open Targets
276 residues, reviewed Q6BCY4; 18 entries from the member databases this page shows along the chain; mean pLDDT 95.81; no experimental structure at PDBe.
UniProt · InterPro · AlphaFold DB · PDBe
ClinVar: 92 records for CYB5R2, 16 pathogenic or likely pathogenic.
