rs184970403

Positions:

• chr1-1048224-C-G
• chr1-1048224-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_198576.4(AGRN):​c.3964C>G​(p.Arg1322Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000359 in 1,392,772 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/19 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R1322W) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000036 (0 hom.)
• Consequence: AGRN NM_198576.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.478

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 Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.107711345).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AGRN	NM_198576.4	c.3964C>G	p.Arg1322Gly	missense_variant	23/36	ENST00000379370.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AGRN	ENST00000379370.7	c.3964C>G	p.Arg1322Gly	missense_variant	23/36	1	NM_198576.4	P1
AGRN	ENST00000651234.1	c.3649C>G	p.Arg1217Gly	missense_variant	22/38
AGRN	ENST00000652369.1	c.3649C>G	p.Arg1217Gly	missense_variant	22/35
AGRN	ENST00000620552.4	c.3550C>G	p.Arg1184Gly	missense_variant	23/39	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000709 AC: 1 AN: 140956 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 76228

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 SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000196

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000359 AC: 5 AN: 1392772 Hom.: 0 Cov.: 35 AF XY: 0.00000146 AC XY: 1 AN XY: 686570

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000464

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.20	T
BayesDel_noAF	Benign	-0.50
CADD	Benign	8.1
DANN	Benign	0.94
Eigen	Benign	-0.94
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.34	N
LIST_S2	Benign	0.61	T;T
M_CAP	Uncertain	0.12	D
MetaRNN	Benign	0.11	T;T
MetaSVM	Benign	-0.92	T
MutationAssessor	Benign	0.20	N;.
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.48	T
PROVEAN	Benign	-0.99	N;.
REVEL	Benign	0.054
Sift	Benign	0.42	T;.
Sift4G	Benign	0.17	T;T
Vest4		0.28
MutPred		0.23		Gain of methylation at R1321 (P = 0.0321);.;
MVP		0.65
MPC		0.42
ClinPred		0.080	T
GERP RS		0.061
gMVP		0.29

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: rs184970403; hg19: chr1-983604;