7-75954007-A-C

Variant names:

• chr7-75954007-A-C
• NM_001395413.1:c.6A>C
• POR p.Gly2Gly

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_001395413.1(POR):​c.6A>C​(p.Gly2Gly) 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. G2G) has been classified as Benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: POR NM_001395413.1 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.424
• 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: 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 (BayesDel_noAF=-0.56).
• BP7: Synonymous conserved (PhyloP=0.424 with no splicing effect.

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.6A>C	p.Gly2Gly	synonymous	Exon 2 of 16	NP_001382342.1	P16435
	POR	NM_001382655.3		c.6A>C	p.Gly2Gly	synonymous	Exon 2 of 17	NP_001369584.2
	POR	NM_001367562.3		c.6A>C	p.Gly2Gly	synonymous	Exon 3 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.6A>C	p.Gly2Gly	synonymous	Exon 2 of 16	ENSP00000419970.2	P16435
	POR	ENST00000910548.1		c.6A>C	p.Gly2Gly	synonymous	Exon 2 of 16	ENSP00000580607.1
	POR	ENST00000910554.1		c.6A>C	p.Gly2Gly	synonymous	Exon 2 of 16	ENSP00000580613.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.56
CADD	Benign	7.0
DANN	Benign	0.62
PhyloP100		0.42
PromoterAI		0.027	Neutral
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

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

Other links and lift over

hg19: chr7-75583325;