Genetic Variant ARFGEF2:p.Pro880Arg (chr20-48989390-C-G) – ACMG Classification: Uncertain_significance (1 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2BP4

The NM_006420.3(ARFGEF2):c.2639C>G(p.Pro880Arg) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,892 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. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P880L) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

ARFGEF2
NM_006420.3 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 6.01

Publications

0 publications found

Variant links:

Genes affected

ARFGEF2 (HGNC:15853): (ADP ribosylation factor guanine nucleotide exchange factor 2) ADP-ribosylation factors (ARFs) play an important role in intracellular vesicular trafficking. The protein encoded by this gene is involved in the activation of ARFs by accelerating replacement of bound GDP with GTP and is involved in Golgi transport. It contains a Sec7 domain, which may be responsible for its guanine-nucleotide exchange activity and also brefeldin A inhibition. [provided by RefSeq, Jul 2008]

ARFGEF2 Gene-Disease associations (from GenCC):

periventricular heterotopia with microcephaly, autosomal recessive
Inheritance: AR Classification: STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), ClinGen
periventricular nodular heterotopia
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ARFGEF2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.3359955).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein
ARFGEF2	NM_006420.3 link	c.2639C>G	p.Pro880Arg	missense_variant	Exon 19 of 39	ENST00000371917.5	NP_006411.2
ARFGEF2	NM_001410846.1 link	c.2636C>G	p.Pro879Arg	missense_variant	Exon 19 of 39		NP_001397775.1
ARFGEF2	XM_047439832.1 link	c.2075C>G	p.Pro692Arg	missense_variant	Exon 17 of 37		XP_047295788.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ARFGEF2	ENST00000371917.5 link	c.2639C>G	p.Pro880Arg	missense_variant	Exon 19 of 39	1	NM_006420.3	ENSP00000360985.4

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461892

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727246

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:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1112010

Other (OTH)

AF:

0.00

AC:

AN:

60396

⚠️ 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: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.34

BayesDel_addAF

Uncertain

0.083

BayesDel_noAF

Benign

-0.12

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.46

Eigen

Benign

0.038

Eigen_PC

Uncertain

0.23

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Pathogenic

0.98

M_CAP

Benign

0.0070

MetaRNN

Benign

0.34

MetaSVM

Benign

-1.1

MutationAssessor

Benign

0.55

PhyloP100

6.0

PrimateAI

Pathogenic

0.82

PROVEAN

Pathogenic

-4.7

REVEL

Benign

0.25

Sift

Benign

0.043

Sift4G

Benign

0.36

Polyphen

0.41

Vest4

0.54

MutPred

0.40

Gain of MoRF binding (P = 0.0053);

MVP

0.71

MPC

0.46

ClinPred

0.89

GERP RS

5.9

Varity_R

0.24

gMVP

0.41

Mutation Taster

=71/29

polymorphism

(source)

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over