Genetic Variant POR:p.Arg403Leu (chr7-75984927-G-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_001395413.1(POR):c.1208G>T(p.Arg403Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000000689 in 1,450,336 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R403H) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

POR
NM_001395413.1 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 6.79

Publications

0 publications found

Variant links:

Genes affected

POR (HGNC:9208): (cytochrome p450 oxidoreductase) This gene encodes an endoplasmic reticulum membrane oxidoreductase that is essential for multiple metabolic processes, including reactions catalyzed by cytochrome P450 proteins for metabolism of steroid hormones, drugs and xenobiotics. The encoded protein has a flavin adenine dinucleotide (FAD)-binding domain and a flavodoxin-like domain which bind two cofactors, FAD and FMN, that allow it to donate electrons directly from NADPH to all microsomal P450 enzymes. Mutations in this gene cause a complex set of disorders, including apparent combined P450C17 and P450C21 deficiency, amenorrhea and disordered steroidogenesis, congenital adrenal hyperplasia and Antley-Bixler syndrome, that resemble those caused by defects in steroid metabolizing enzymes such as aromatase, 21-hydroxylase, and 17 alpha-hydroxylase. [provided by RefSeq, Aug 2020]

POR Gene-Disease associations (from GenCC):

Antley-Bixler syndrome with genital anomalies and disordered steroidogenesis
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: ClinGen, PanelApp Australia, Ambry Genetics
congenital adrenal hyperplasia due to cytochrome P450 oxidoreductase deficiency
Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet
Antley-Bixler syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

POR links:

Genome browser will be placed here

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
POR	NM_001395413.1 link	c.1208G>T	p.Arg403Leu	missense_variant	Exon 11 of 16	ENST00000461988.6	NP_001382342.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
POR	ENST00000461988.6 link	c.1208G>T	p.Arg403Leu	missense_variant	Exon 11 of 16	1	NM_001395413.1	ENSP00000419970.2		P16435

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.89e-7

AC:

AN:

1450336

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

719510

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33294

American (AMR)

AF:

0.00

AC:

AN:

44438

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25856

East Asian (EAS)

AF:

0.00

AC:

AN:

39438

South Asian (SAS)

AF:

0.00

AC:

AN:

85880

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51614

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5726

European-Non Finnish (NFE)

AF:

9.06e-7

AC:

AN:

1104276

Other (OTH)

AF:

0.00

AC:

AN:

59814

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.40

BayesDel_addAF

Uncertain

0.11

BayesDel_noAF

Benign

-0.090

CADD

Benign

(source)

DANN

Uncertain

0.99

Eigen

Benign

-0.27

Eigen_PC

Benign

-0.096

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.95

.;.;D

M_CAP

Benign

0.035

MetaRNN

Uncertain

0.63

D;D;D

MetaSVM

Benign

-1.1

PhyloP100

6.8

PrimateAI

Benign

0.44

PROVEAN

Benign

-2.3

N;N;D

REVEL

Uncertain

0.30

Sift

Benign

0.32

T;T;T

Sift4G

Benign

0.34

T;T;T

Vest4

0.79

MVP

0.69

MPC

0.14

ClinPred

0.84

GERP RS

2.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

gMVP

0.48

Mutation Taster

=13/87

disease causing

(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

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over