20-48922217-C-T

Variant names:

• chr20-48922217-C-T
• rs144094432
• NM_006420.3:c.121+207C>T

Variant summary

Our verdict is Benign. The variant received -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BS1 BS2

The NM_006420.3(ARFGEF2):​c.121+207C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00636 in 152,350 control chromosomes in the GnomAD database, including 6 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency: Genomes: 𝑓 0.0064 (6 hom., cov: 32)
• Consequence: ARFGEF2 NM_006420.3 intron
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 1.65
• Publications: 0 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: STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), ClinGen
• periventricular nodular heterotopia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000294533 (HGNC:):

ACMG classification

Our verdict: Benign. The variant received -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.53).
• BP6: Variant 20-48922217-C-T is Benign according to our data. Variant chr20-48922217-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 1216921.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.00636 (969/152350) while in subpopulation SAS AF = 0.023 (111/4828). AF 95% confidence interval is 0.0195. There are 6 homozygotes in GnomAd4. There are 453 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 6 AR,AD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ARFGEF2	NM_006420.3	c.121+207C>T		intron_variant	Intron 1 of 38	ENST00000371917.5	NP_006411.2
ARFGEF2	NM_001410846.1	c.121+207C>T		intron_variant	Intron 1 of 38		NP_001397775.1
ARFGEF2	XM_047439832.1	c.-289+207C>T		intron_variant	Intron 1 of 36		XP_047295788.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ARFGEF2	ENST00000371917.5	c.121+207C>T		intron_variant	Intron 1 of 38	1	NM_006420.3	ENSP00000360985.4

Frequencies

GnomAD3 genomes AF: 0.00638 AC: 971 AN: 152232 Hom.: 6 Cov.: 32

Gnomad AFR AF: 0.00154

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00275

Gnomad ASJ AF: 0.0112

Gnomad EAS AF: 0.000385

Gnomad SAS AF: 0.0234

Gnomad FIN AF: 0.00847

Gnomad MID AF: 0.0253

Gnomad NFE AF: 0.00878

Gnomad OTH AF: 0.00764

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.00636 AC: 969 AN: 152350 Hom.: 6 Cov.: 32 AF XY: 0.00608 AC XY: 453 AN XY: 74500

African (AFR) AF: 0.00154 AC: 64 AN: 41594

American (AMR) AF: 0.00274 AC: 42 AN: 15308

Ashkenazi Jewish (ASJ) AF: 0.0112 AC: 39 AN: 3470

East Asian (EAS) AF: 0.000386 AC: 2 AN: 5178

South Asian (SAS) AF: 0.0230 AC: 111 AN: 4828

European-Finnish (FIN) AF: 0.00847 AC: 90 AN: 10624

Middle Eastern (MID) AF: 0.0272 AC: 8 AN: 294

European-Non Finnish (NFE) AF: 0.00878 AC: 597 AN: 68026

Other (OTH) AF: 0.00756 AC: 16 AN: 2116

Alfa AF: 0.00666 Hom.: 1

Bravo AF: 0.00533

Asia WGS AF: 0.00808 AC: 28 AN: 3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Benign:1

Jul 17, 2018

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.53
CADD	Benign	15
DANN	Benign	0.86
PhyloP100		1.7
PromoterAI		-0.023	Neutral
Mutation Taster		=100/0	polymorphism

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: rs144094432; hg19: chr20-47538754;