7-75972440-T-G

Variant names:

• chr7-75972440-T-G
• rs1554556319
• NM_001395413.1:c.207T>G
• POR p.Phe69Leu

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_001395413.1(POR):​c.207T>G​(p.Phe69Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000686 in 1,457,382 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: POR NM_001395413.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.376
• Publications: 0 publications found

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 Submitted by: Ambry Genetics, ClinGen
• congenital adrenal hyperplasia due to cytochrome P450 oxidoreductase deficiency

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)
• Antley-Bixler syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.849

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001395413.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	POR	NM_001395413.1	MANE Select	c.207T>G	p.Phe69Leu	missense	Exon 3 of 16	NP_001382342.1	P16435
	POR	NM_001382655.3		c.261T>G	p.Phe87Leu	missense	Exon 4 of 17	NP_001369584.2
	POR	NM_001367562.3		c.207T>G	p.Phe69Leu	missense	Exon 4 of 17	NP_001354491.2	P16435

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	POR	ENST00000461988.6	TSL:1 MANE Select	c.207T>G	p.Phe69Leu	missense	Exon 3 of 16	ENSP00000419970.2	P16435
	POR	ENST00000475509.2	TSL:5	c.-10T>G		5_prime_UTR_premature_start_codon_gain	Exon 3 of 16	ENSP00000516446.1	A0A9L9PXL8
	POR	ENST00000447222.5	TSL:5	c.132T>G	p.Phe44Leu	missense	Exon 2 of 15	ENSP00000393527.1	H0Y4R2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000414 AC: 1 AN: 241570 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000568

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.86e-7 AC: 1 AN: 1457382 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 724476

African (AFR) AF: 0.00 AC: 0 AN: 33428

American (AMR) AF: 0.00 AC: 0 AN: 43994

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26002

East Asian (EAS) AF: 0.0000252 AC: 1 AN: 39628

South Asian (SAS) AF: 0.00 AC: 0 AN: 85056

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53182

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1110080

Other (OTH) AF: 0.00 AC: 0 AN: 60244

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Congenital adrenal hyperplasia due to cytochrome P450 oxidoreductase deficiency (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Uncertain	0.020	T
BayesDel_noAF	Uncertain	-0.070
CADD	Benign	15
DANN	Benign	0.73
Eigen	Benign	-0.54
Eigen_PC	Benign	-0.58
FATHMM_MKL	Benign	0.60	D
M_CAP	Uncertain	0.089	D
MetaRNN	Pathogenic	0.85	D
MetaSVM	Benign	-0.54	T
PhyloP100		-0.38
PROVEAN	Pathogenic	-12	D
REVEL	Uncertain	0.43
Mutation Taster		=7/93	disease causing

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs1554556319;

hg19: chr7-75601758;