1-1020221-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_198576.4(AGRN):c.49C>T(p.Leu17Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000565 in 1,415,326 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000047 ( 0 hom. )

Consequence

AGRN
NM_198576.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: -0.0270

Variant links:

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]

AGRN links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

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=0.23941833).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AGRN	NM_198576.4 linkuse as main transcript	c.49C>T	p.Leu17Phe	missense_variant	1/36	ENST00000379370.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AGRN	ENST00000379370.7 linkuse as main transcript	c.49C>T	p.Leu17Phe	missense_variant	1/36	1	NM_198576.4	P1	O00468-6
AGRN	ENST00000620552.4 linkuse as main transcript	c.-366C>T		5_prime_UTR_variant	1/39	5

Frequencies

GnomAD3 genomes

AF:

0.0000132

AC:

AN:

151640

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

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

GnomAD3 exomes

AF:

0.0000325

AC:

AN:

61450

Hom.:

AF XY:

0.0000554

AC XY:

AN XY:

36108

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000186

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000475

AC:

AN:

1263686

Hom.:

Cov.:

AF XY:

0.00000643

AC XY:

AN XY:

621800

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000193

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:

0.00000197

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000132

AC:

AN:

151640

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74090

show subpopulations

Gnomad4 AFR

AF:

0.0000483

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000189

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Sep 07, 2016

The L17F variant in the AGRN gene has not been reported previously as a pathogenic variant, nor asa benign variant, to our knowledge. The L17F variant was not observed in approximately 2700individuals of European and African American ancestry in the NHLBI Exome Sequencing Project,indicating it is not a common benign variant in these populations. This substitution occurs at aposition that is conserved in mammals. However, the L17F variant is a conservative amino acidsubstitution, which is not likely to impact secondary protein structure as these residues share similarproperties and in silico analysis predicts this variant likely does not alter the proteinstructure/function. We interpret L17F as a variant of uncertain significance. -

Congenital myasthenic syndrome 8

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Mar 26, 2022

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Not Available"; Align-GVGD: "Class C0"). ClinVar contains an entry for this variant (Variation ID: 388958). This variant has not been reported in the literature in individuals affected with AGRN-related conditions. This variant is present in population databases (no rsID available, gnomAD 0.03%). This sequence change replaces leucine, which is neutral and non-polar, with phenylalanine, which is neutral and non-polar, at codon 17 of the AGRN protein (p.Leu17Phe). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Benign

-0.24

BayesDel_noAF

Benign

-0.28

Cadd

Benign

Dann

Benign

0.86

Eigen

Benign

-0.80

Eigen_PC

Benign

-0.98

FATHMM_MKL

Benign

0.075

LIST_S2

Benign

0.43

M_CAP

Pathogenic

0.91

MetaRNN

Benign

0.24

MetaSVM

Benign

-0.86

MutationAssessor

Benign

1.9

MutationTaster

Benign

1.0

PrimateAI

Pathogenic

0.90

PROVEAN

Benign

-0.70

REVEL

Benign

0.16

Sift

Benign

0.44

Sift4G

Benign

0.076

Vest4

0.31

MutPred

0.27

Loss of disorder (P = 0.0421);

MVP

0.67

MPC

0.47

ClinPred

0.064

GERP RS

-0.37

gMVP

0.19

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over