chr20-49028628-C-A

Position:

• chr20-49028628-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_006420.3(ARFGEF2):​c.5023C>A​(p.Arg1675Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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)
• Consequence: ARFGEF2 NM_006420.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.16

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 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=0.33384115).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ARFGEF2	NM_006420.3	c.5023C>A	p.Arg1675Ser	missense_variant	37/39	ENST00000371917.5	NP_006411.2
ARFGEF2	NM_001410846.1	c.5020C>A	p.Arg1674Ser	missense_variant	37/39		NP_001397775.1
ARFGEF2	XM_047439832.1	c.4459C>A	p.Arg1487Ser	missense_variant	35/37		XP_047295788.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ARFGEF2	ENST00000371917.5	c.5023C>A	p.Arg1675Ser	missense_variant	37/39	1	NM_006420.3	ENSP00000360985	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.94
BayesDel_addAF	Uncertain	0.061	T
BayesDel_noAF	Benign	-0.15
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.45	T
Eigen	Uncertain	0.55
Eigen_PC	Uncertain	0.57
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Pathogenic	0.98	D
M_CAP	Benign	0.015	T
MetaRNN	Benign	0.33	T
MetaSVM	Uncertain	-0.28	T
MutationAssessor	Pathogenic	3.0	M
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.52	T
PROVEAN	Pathogenic	-4.6	D
REVEL	Benign	0.29
Sift	Uncertain	0.015	D
Sift4G	Benign	0.10	T
Polyphen		0.88	P
Vest4		0.45
MutPred		0.42		Gain of disorder (P = 0.0833);
MVP		0.55
MPC		0.64
ClinPred		1.0	D
GERP RS		5.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.68
gMVP		0.38

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

Other links and lift over

dbSNP: rs540246597; hg19: chr20-47645165;