NM_198576.4:c.2025C>G

Variant names:

• chr1-1044134-C-G
• rs28484890
• NM_198576.4:c.2025C>G

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BS1 BS2

The NM_198576.4(AGRN):​c.2025C>G​(p.Gly675Gly) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.002 in 1,613,270 control chromosomes in the GnomAD database, including 59 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.010 (29 hom., cov: 33)
  • Exomes 𝑓: 0.0011 (30 hom.)
• Consequence: AGRN NM_198576.4 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: 0.405

Genes affected

AGRN (HGNC:329): (agrin) This gene encodes one of several proteins that are critical in the development of the neuromuscular junction (NMJ), as identified in mouse knock-out studies. The encoded protein contains several laminin G, Kazal type serine protease inhibitor, and epidermal growth factor domains. Additional post-translational modifications occur to add glycosaminoglycans and disulfide bonds. In one family with congenital myasthenic syndrome affecting limb-girdle muscles, a mutation in this gene was found. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Mar 2015]

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.49).
• BP6: Variant 1-1044134-C-G is Benign according to our data. Variant chr1-1044134-C-G is described in ClinVar as [Likely_benign]. Clinvar id is 128293.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=0.405 with no splicing effect.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0104 (1585/152318) while in subpopulation AFR AF= 0.0362 (1504/41568). AF 95% confidence interval is 0.0347. There are 29 homozygotes in gnomad4. There are 753 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 29 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AGRN	NM_198576.4	c.2025C>G	p.Gly675Gly	synonymous_variant	Exon 11 of 36	ENST00000379370.7	NP_940978.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AGRN	ENST00000379370.7	c.2025C>G	p.Gly675Gly	synonymous_variant	Exon 11 of 36	1	NM_198576.4	ENSP00000368678.2
AGRN	ENST00000651234.1	c.1710C>G	p.Gly570Gly	synonymous_variant	Exon 10 of 38			ENSP00000499046.1
AGRN	ENST00000652369.1	c.1710C>G	p.Gly570Gly	synonymous_variant	Exon 10 of 35			ENSP00000498543.1
AGRN	ENST00000620552.4	c.1611C>G	p.Gly537Gly	synonymous_variant	Exon 11 of 39	5		ENSP00000484607.1

Frequencies

GnomAD3 genomes AF: 0.0103 AC: 1569 AN: 152200 Hom.: 28 Cov.: 33

Gnomad AFR AF: 0.0359

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00399

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00633

Gnomad NFE AF: 0.0000735

Gnomad OTH AF: 0.00621

GnomAD3 exomes AF: 0.00280 AC: 700 AN: 250268 Hom.: 12 AF XY: 0.00213 AC XY: 289 AN XY: 135678

Gnomad AFR exome AF: 0.0377

Gnomad AMR exome AF: 0.00194

Gnomad ASJ exome AF: 0.0000997

Gnomad EAS exome AF: 0.000109

Gnomad SAS exome AF: 0.0000653

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000115

Gnomad OTH exome AF: 0.000983

GnomAD4 exome AF: 0.00113 AC: 1646 AN: 1460952 Hom.: 30 Cov.: 35 AF XY: 0.000967 AC XY: 703 AN XY: 726818

Gnomad4 AFR exome AF: 0.0380

Gnomad4 AMR exome AF: 0.00212

Gnomad4 ASJ exome AF: 0.0000383

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.0000927

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000414

Gnomad4 OTH exome AF: 0.00331

GnomAD4 genome AF: 0.0104 AC: 1585 AN: 152318 Hom.: 29 Cov.: 33 AF XY: 0.0101 AC XY: 753 AN XY: 74488

Gnomad4 AFR AF: 0.0362

Gnomad4 AMR AF: 0.00399

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000735

Gnomad4 OTH AF: 0.00614

Alfa AF: 0.00306 Hom.: 1

Bravo AF: 0.0115

Asia WGS AF: 0.00433 AC: 15 AN: 3478

EpiCase AF: 0.000164

EpiControl AF: 0.000119

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:2

-

Genetic Services Laboratory, University of Chicago

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

Likely benign based on allele frequency in 1000 Genomes Project or ESP global frequency and its presence in a patient with a rare or unrelated disease phenotype. NOT Sanger confirmed. -

-

PreventionGenetics, part of Exact Sciences

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Benign:2

Dec 14, 2020

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

-

Breakthrough Genomics, Breakthrough Genomics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Congenital myasthenic syndrome 8 Benign:1

Jan 31, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: 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	-0.49
CADD	Benign	4.7
DANN	Benign	0.42
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

Publications

LitVar

Other links and lift over

dbSNP: rs28484890; hg19: chr1-979514;