chr20-49033069-T-C

Position:

chr20-49033069-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 3P and 3B. PM2PP2BP4_ModerateBS1_Supporting

The NM_006420.3(ARFGEF2):c.5228T>C(p.Met1743Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000706 in 1,614,244 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00038 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000038 ( 0 hom. )

Consequence

ARFGEF2
NM_006420.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 8.02

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 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), ARFGEF2. . Gene score misZ 2.5971 (greater than the threshold 3.09). Trascript score misZ 4.3519 (greater than threshold 3.09). GenCC has associacion of gene with periventricular nodular heterotopia, periventricular heterotopia with microcephaly, autosomal recessive.

BP4

Computational evidence support a benign effect (MetaRNN=0.26109493).

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.000381 (58/152354) while in subpopulation AFR AF= 0.0013 (54/41578). AF 95% confidence interval is 0.00102. There are 0 homozygotes in gnomad4. There are 25 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
ARFGEF2	NM_006420.3 linkuse as main transcript	c.5228T>C	p.Met1743Thr	missense_variant	39/39	ENST00000371917.5	NP_006411.2
ARFGEF2	NM_001410846.1 linkuse as main transcript	c.5225T>C	p.Met1742Thr	missense_variant	39/39		NP_001397775.1
ARFGEF2	XM_047439832.1 linkuse as main transcript	c.4664T>C	p.Met1555Thr	missense_variant	37/37		XP_047295788.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ARFGEF2	ENST00000371917.5 linkuse as main transcript	c.5228T>C	p.Met1743Thr	missense_variant	39/39	1	NM_006420.3	ENSP00000360985	P4

Frequencies

GnomAD3 genomes

AF:

0.000388

AC:

AN:

152236

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00133

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000283

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000111

AC:

AN:

251456

Hom.:

AF XY:

0.000110

AC XY:

AN XY:

135910

show subpopulations

Gnomad AFR exome

AF:

0.00123

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.000185

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000383

AC:

AN:

1461890

Hom.:

Cov.:

AF XY:

0.0000371

AC XY:

AN XY:

727246

show subpopulations

Gnomad4 AFR exome

AF:

0.000986

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.000168

Gnomad4 NFE exome

AF:

0.00000360

Gnomad4 OTH exome

AF:

0.0000662

GnomAD4 genome

AF:

0.000381

AC:

AN:

152354

Hom.:

Cov.:

AF XY:

0.000336

AC XY:

AN XY:

74506

show subpopulations

Gnomad4 AFR

AF:

0.00130

Gnomad4 AMR

AF:

0.0000653

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000283

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000263

Hom.:

Bravo

AF:

0.000340

ESP6500AA

AF:

0.000908

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000140

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jun 18, 2022	This sequence change replaces methionine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 1743 of the ARFGEF2 protein (p.Met1743Thr). This variant is present in population databases (rs367994107, gnomAD 0.1%). This variant has not been reported in the literature in individuals affected with ARFGEF2-related conditions. ClinVar contains an entry for this variant (Variation ID: 423506). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C25"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Sep 04, 2024	In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -
Uncertain significance, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Apr 04, 2023	- -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

May 09, 2016

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.32

BayesDel_addAF

Benign

-0.059

BayesDel_noAF

Uncertain

0.10

CADD

Uncertain

DANN

Benign

0.96

DEOGEN2

Uncertain

0.47

Eigen

Uncertain

0.19

Eigen_PC

Uncertain

0.36

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Benign

0.77

M_CAP

Benign

0.023

MetaRNN

Benign

0.26

MetaSVM

Benign

-0.77

MutationAssessor

Benign

1.8

MutationTaster

Benign

1.0

PrimateAI

Pathogenic

0.87

PROVEAN

Uncertain

-2.6

REVEL

Uncertain

0.35

Sift

Benign

0.10

Sift4G

Benign

0.13

Polyphen

0.085

Vest4

0.87

MVP

0.70

MPC

0.50

ClinPred

0.16

GERP RS

5.7

Varity_R

0.41

gMVP

0.73

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over