20-48921970-C-T

Variant names:

• chr20-48921970-C-T
• rs368957600
• NM_006420.3:c.81C>T

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_006420.3(ARFGEF2):​c.81C>T​(p.Pro27Pro) variant causes a synonymous 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. Synonymous variant affecting the same amino acid position (i.e. P27P) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: ARFGEF2 NM_006420.3 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.350
• Publications: 1 publications found

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: DEFINITIVE, STRONG Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), G2P
• periventricular nodular heterotopia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000294533 (HGNC:):

ACMG classification

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=-0.49).
• BP7: Synonymous conserved (PhyloP=-0.35 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006420.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ARFGEF2	NM_006420.3	MANE Select	c.81C>T	p.Pro27Pro	synonymous	Exon 1 of 39	NP_006411.2	Q9Y6D5
	ARFGEF2	NM_001410846.1		c.81C>T	p.Pro27Pro	synonymous	Exon 1 of 39	NP_001397775.1	A0A7P0T7Z2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ARFGEF2	ENST00000371917.5	TSL:1 MANE Select	c.81C>T	p.Pro27Pro	synonymous	Exon 1 of 39	ENSP00000360985.4	Q9Y6D5
	ARFGEF2	ENST00000679436.1		c.81C>T	p.Pro27Pro	synonymous	Exon 1 of 39	ENSP00000504888.1	A0A7P0T7Z2
	ARFGEF2	ENST00000939861.1		c.81C>T	p.Pro27Pro	synonymous	Exon 1 of 39	ENSP00000609920.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00 AC: 0 AN: 187030 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1424998 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 705500

African (AFR) AF: 0.00 AC: 0 AN: 32694

American (AMR) AF: 0.00 AC: 0 AN: 39022

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25390

East Asian (EAS) AF: 0.00 AC: 0 AN: 37706

South Asian (SAS) AF: 0.00 AC: 0 AN: 81212

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50498

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5722

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1093814

Other (OTH) AF: 0.00 AC: 0 AN: 58940

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.49
CADD	Benign	14
DANN	Benign	0.92
PhyloP100		-0.35
PromoterAI		0.035	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8

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

Other links and lift over

dbSNP: rs368957600; hg19: chr20-47538507;