7-75984963-GC-GCCCC

Variant names:

• chr7-75984963-G-GCCC
• rs797045899
• NM_001395413.1:c.1239+8_1239+10dupCCC

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001395413.1(POR):​c.1239+8_1239+10dupCCC variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000702 in 1,425,456 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: POR NM_001395413.1 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.02
• 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, 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: 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	c.1239+8_1239+10dupCCC		intron_variant	Intron 11 of 15	ENST00000461988.6	NP_001382342.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
POR	ENST00000461988.6	c.1239+5_1239+6insCCC		splice_region_variant, intron_variant	Intron 11 of 15	1	NM_001395413.1	ENSP00000419970.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.02e-7 AC: 1 AN: 1425456 Hom.: 0 Cov.: 44 AF XY: 0.00000142 AC XY: 1 AN XY: 704846

African (AFR) AF: 0.0000302 AC: 1 AN: 33100

American (AMR) AF: 0.00 AC: 0 AN: 43432

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24128

East Asian (EAS) AF: 0.00 AC: 0 AN: 38708

South Asian (SAS) AF: 0.00 AC: 0 AN: 82414

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 46908

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5548

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1092416

Other (OTH) AF: 0.00 AC: 0 AN: 58802

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		1.0

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs797045899; hg19: chr7-75614281;