chr20-48921940-G-A

Variant names:

• chr20-48921940-G-A
• rs1413610451
• NM_006420.3:c.51G>A

Variant summary

Our verdict is Benign. The variant received -10 ACMG points: 0P and 10B. BP4_Strong BP6_Moderate BS1

The NM_006420.3(ARFGEF2):​c.51G>A​(p.Lys17Lys) variant causes a synonymous change. The variant allele was found at a frequency of 0.00000383 in 1,565,104 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 Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.000026 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: ARFGEF2 NM_006420.3 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 3.69
• 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 -10 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.52).
• BP6: Variant 20-48921940-G-A is Benign according to our data. Variant chr20-48921940-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 2728906.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.0000263 (4/152124) while in subpopulation AFR AF = 0.0000965 (4/41460). AF 95% confidence interval is 0.0000325. There are 0 homozygotes in GnomAd4. There are 2 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ARFGEF2	NM_006420.3	c.51G>A	p.Lys17Lys	synonymous_variant	Exon 1 of 39	ENST00000371917.5	NP_006411.2
ARFGEF2	NM_001410846.1	c.51G>A	p.Lys17Lys	synonymous_variant	Exon 1 of 39		NP_001397775.1
ARFGEF2	XM_047439832.1	c.-359G>A		5_prime_UTR_variant	Exon 1 of 37		XP_047295788.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ARFGEF2	ENST00000371917.5	c.51G>A	p.Lys17Lys	synonymous_variant	Exon 1 of 39	1	NM_006420.3	ENSP00000360985.4

Frequencies

GnomAD3 genomes AF: 0.0000263 AC: 4 AN: 152124 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000965

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.00 AC: 0 AN: 172406 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 AF: 0.00000142 AC: 2 AN: 1412980 Hom.: 0 Cov.: 31 AF XY: 0.00000143 AC XY: 1 AN XY: 698410

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.0000620 AC: 2 AN: 32246

American (AMR) AF: 0.00 AC: 0 AN: 37100

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25254

East Asian (EAS) AF: 0.00 AC: 0 AN: 36876

South Asian (SAS) AF: 0.00 AC: 0 AN: 80180

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 49952

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5710

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1087146

Other (OTH) AF: 0.00 AC: 0 AN: 58516

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000203), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome AF: 0.0000263 AC: 4 AN: 152124 Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2 AN XY: 74330

African (AFR) AF: 0.0000965 AC: 4 AN: 41460

American (AMR) AF: 0.00 AC: 0 AN: 15276

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5166

South Asian (SAS) AF: 0.00 AC: 0 AN: 4824

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10622

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67988

Other (OTH) AF: 0.00 AC: 0 AN: 2090

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Benign:1

Feb 16, 2023

Labcorp Genetics (formerly Invitae), Labcorp

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	-0.52
CADD	Benign	15
DANN	Benign	0.92
PhyloP100		3.7
PromoterAI		-0.080	Neutral

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

Other links and lift over

dbSNP: rs1413610451; hg19: chr20-47538477;