Genetic Variant POR:p.Ala482Ala (chr7-75985635-T-A) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2BP4_ModerateBP6_ModerateBP7

The NM_001395413.1(POR):c.1446T>A(p.Ala482Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Synonymous variant affecting the same amino acid position (i.e. A482A) has been classified as Benign.

Frequency

Genomes: not found (cov: 37)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

POR
NM_001395413.1 synonymous

Scores

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: -6.08

Publications

27 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: Likely_benign. The variant received -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (REVEL=0.03).

BP6

Variant 7-75985635-T-A is Benign according to our data. Variant chr7-75985635-T-A is described in ClinVar as Likely_benign. ClinVar VariationId is 3011112.Status of the report is criteria_provided_single_submitter, 1 stars.

BP7

Synonymous conserved (PhyloP=-6.08 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
POR	NM_001395413.1 link	c.1446T>A	p.Ala482Ala	synonymous_variant	Exon 13 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.1446T>A	p.Ala482Ala	synonymous_variant	Exon 13 of 16	1	NM_001395413.1	ENSP00000419970.2		P16435

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000452

AC:

AN:

221316

AF XY:

0.00000827

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000101

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.00000208

AC:

AN:

1440752

Hom.:

Cov.:

AF XY:

0.00000280

AC XY:

AN XY:

714396

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33106

American (AMR)

AF:

0.00

AC:

AN:

42610

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25310

East Asian (EAS)

AF:

0.00

AC:

AN:

38924

South Asian (SAS)

AF:

0.00

AC:

AN:

83088

European-Finnish (FIN)

AF:

0.00

AC:

AN:

50514

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5702

European-Non Finnish (NFE)

AF:

0.00000272

AC:

AN:

1101974

Other (OTH)

AF:

0.00

AC:

AN:

59524

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: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Congenital adrenal hyperplasia due to cytochrome P450 oxidoreductase deficiency

Benign:1

Feb 21, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.83

CADD

Benign

0.21

(source)

DANN

Benign

0.77

PhyloP100

-6.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

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