Genetic Variant TFPI2:p.Arg228Arg (chr7-93886846-G-T) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2BP4_StrongBP7

The NM_006528.4(TFPI2):c.682C>A(p.Arg228Arg) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000714 in 1,400,238 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: 7.1e-7 ( 0 hom. )

Consequence

TFPI2
NM_006528.4 synonymous

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.0340

Publications

0 publications found

Variant links:

Genes affected

TFPI2 (HGNC:11761): (tissue factor pathway inhibitor 2) This gene encodes a member of the Kunitz-type serine proteinase inhibitor family. The protein can inhibit a variety of serine proteases including factor VIIa/tissue factor, factor Xa, plasmin, trypsin, chymotryspin and plasma kallikrein. This gene has been identified as a tumor suppressor gene in several types of cancer. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2012]

TFPI2 links:

GNGT1 (HGNC:4411): (G protein subunit gamma transducin 1) This gene encodes the gamma subunit of transducin, a guanine nucleotide-binding protein (G protein) that is found in rod outer segments. Transducin, also known as GMPase, mediates the activation of a cyclic GTP-specific (guanosine monophosphate) phosphodiesterase by rhodopsin. [provided by RefSeq, Jul 2016]

GNGT1 links:

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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 (BayesDel_noAF=-0.81).

BP7

Synonymous conserved (PhyloP=0.034 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006528.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
TFPI2	NM_006528.4	MANE Select	c.682C>A	p.Arg228Arg	synonymous	Exon 5 of 5	NP_006519.1	P48307-1
TFPI2	NM_001271003.2		c.649C>A	p.Arg217Arg	synonymous	Exon 5 of 5	NP_001257932.1	P48307-2
TFPI2	NM_001271004.2		c.*45C>A		3_prime_UTR	Exon 5 of 5	NP_001257933.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
TFPI2	ENST00000222543.11	TSL:1 MANE Select	c.682C>A	p.Arg228Arg	synonymous	Exon 5 of 5	ENSP00000222543.5	P48307-1
TFPI2	ENST00000650573.1		c.700C>A	p.Arg234Arg	synonymous	Exon 5 of 5	ENSP00000497131.1	A0A3B3IS67
TFPI2	ENST00000898459.1		c.511C>A	p.Arg171Arg	synonymous	Exon 4 of 4	ENSP00000568518.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

7.14e-7

AC:

AN:

1400238

Hom.:

Cov.:

AF XY:

0.00000144

AC XY:

AN XY:

696054

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

29238

American (AMR)

AF:

0.00

AC:

AN:

29398

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

24452

East Asian (EAS)

AF:

0.00

AC:

AN:

36448

South Asian (SAS)

AF:

0.0000133

AC:

AN:

75444

European-Finnish (FIN)

AF:

0.00

AC:

AN:

47834

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5614

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1093858

Other (OTH)

AF:

0.00

AC:

AN:

57952

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.225

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.81

CADD

Benign

1.1

(source)

DANN

Benign

0.48

PhyloP100

0.034

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over