Genetic Variant CYB5R4:p.Pro10Leu (chr6-83859811-C-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_016230.4(CYB5R4):c.29C>T(p.Pro10Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,098 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P10S) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

CYB5R4
NM_016230.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 6.55

Publications

0 publications found

Variant links:

Genes affected

CYB5R4 (HGNC:20147): (cytochrome b5 reductase 4) NCB5OR is a flavohemoprotein that contains functional domains found in both cytochrome b5 (CYB5A; MIM 613218) and CYB5 reductase (CYB5R3; MIM 613213) (Zhu et al., 1999 [PubMed 10611283]).[supplied by OMIM, Jan 2010]

CYB5R4 links:

RIPPLY2-CYB5R4 (HGNC:):

RIPPLY2-CYB5R4 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CYB5R4	NM_016230.4 link	c.29C>T	p.Pro10Leu	missense_variant	Exon 1 of 16	ENST00000369681.10	NP_057314.2	Q7L1T6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
CYB5R4	ENST00000369681.10 link	c.29C>T	p.Pro10Leu	missense_variant	Exon 1 of 16	1	NM_016230.4	ENSP00000358695.3	Q7L1T6
CYB5R4	ENST00000369679.4 link	c.-74C>T		5_prime_UTR_premature_start_codon_gain_variant	Exon 1 of 5	3		ENSP00000358693.4	A0A0A0MRM6
CYB5R4	ENST00000369679.4 link	c.-74C>T		5_prime_UTR_variant	Exon 1 of 5	3		ENSP00000358693.4	A0A0A0MRM6

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461098

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726846

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33460

American (AMR)

AF:

0.00

AC:

AN:

44668

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26104

East Asian (EAS)

AF:

0.00

AC:

AN:

39680

South Asian (SAS)

AF:

0.00

AC:

AN:

86146

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53166

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111782

Other (OTH)

AF:

0.00

AC:

AN:

60328

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Apr 10, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.29C>T (p.P10L) alteration is located in exon 1 (coding exon 1) of the CYB5R4 gene. This alteration results from a C to T substitution at nucleotide position 29, causing the proline (P) at amino acid position 10 to be replaced by a leucine (L). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.75

BayesDel_addAF

Pathogenic

0.18

BayesDel_noAF

Uncertain

0.030

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.48

Eigen

Uncertain

0.34

Eigen_PC

Uncertain

0.39

FATHMM_MKL

Uncertain

0.83

LIST_S2

Uncertain

0.95

M_CAP

Uncertain

0.094

MetaRNN

Uncertain

0.66

MetaSVM

Benign

-0.86

MutationAssessor

Uncertain

2.8

PhyloP100

6.5

PrimateAI

Uncertain

0.66

PROVEAN

Uncertain

-3.4

REVEL

Benign

0.29

Sift

Pathogenic

0.0

Sift4G

Uncertain

0.054

Polyphen

0.85

Vest4

0.58

MutPred

0.27

Loss of glycosylation at P10 (P = 0.0401);

MVP

0.83

MPC

0.55

ClinPred

1.0

GERP RS

5.5

PromoterAI

0.019

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Varity_R

0.63

gMVP

0.65

Mutation Taster

=212/88

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over