chr7-75972549-G-T

Variant names:

• chr7-75972549-G-T
• rs17148944
• NM_001395413.1:c.228+88G>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001395413.1(POR):​c.228+88G>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000447 in 1,118,914 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000045 (0 hom.)
• Consequence: POR NM_001395413.1 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0350
• Publications: 21 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, 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

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.83).

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	POR	NM_001395413.1	MANE Select	c.228+88G>T		intron	N/A	NP_001382342.1
	POR	NM_001382655.3		c.282+88G>T		intron	N/A	NP_001369584.2
	POR	NM_001367562.3		c.228+88G>T		intron	N/A	NP_001354491.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	POR	ENST00000461988.6	TSL:1 MANE Select	c.228+88G>T		intron	N/A	ENSP00000419970.2
	POR	ENST00000448410.5	TSL:3	n.*19G>T		non_coding_transcript_exon	Exon 3 of 5	ENSP00000399409.2
	POR	ENST00000448410.5	TSL:3	n.*19G>T		3_prime_UTR	Exon 3 of 5	ENSP00000399409.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000637 AC: 1 AN: 156952 AF XY: 0.0000120

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: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000447 AC: 5 AN: 1118914 Hom.: 0 Cov.: 15 AF XY: 0.00000532 AC XY: 3 AN XY: 564254

African (AFR) AF: 0.00 AC: 0 AN: 25976

American (AMR) AF: 0.00 AC: 0 AN: 35378

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 23460

East Asian (EAS) AF: 0.00 AC: 0 AN: 34538

South Asian (SAS) AF: 0.0000681 AC: 5 AN: 73460

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 48096

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4976

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 824022

Other (OTH) AF: 0.00 AC: 0 AN: 49008

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.83
CADD	Benign	1.2
DANN	Benign	0.61
PhyloP100		-0.035

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

Other links and lift over

dbSNP: rs17148944; hg19: chr7-75601867;