1-1046519-G-C

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4_StrongBP6

The NM_198576.4(AGRN):c.3034G>C(p.Ala1012Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000749 in 1,602,004 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A1012T) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000076 ( 0 hom. )

Consequence

AGRN
NM_198576.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.105

Publications

1 publications found

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 Gene-Disease associations (from GenCC):

congenital myasthenic syndrome 8
Inheritance: AR Classification: STRONG Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
presynaptic congenital myasthenic syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
postsynaptic congenital myasthenic syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

AGRN links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.044953197).

BP6

Variant 1-1046519-G-C is Benign according to our data. Variant chr1-1046519-G-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 1950660.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AGRN	NM_198576.4 link	c.3034G>C	p.Ala1012Pro	missense_variant	Exon 18 of 36	ENST00000379370.7	NP_940978.2	O00468-6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AGRN	ENST00000379370.7 link	c.3034G>C	p.Ala1012Pro	missense_variant	Exon 18 of 36	1	NM_198576.4	ENSP00000368678.2		O00468-6

Frequencies

GnomAD3 genomes

AF:

0.00000662

AC:

AN:

151042

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.00318

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000817

AC:

AN:

244862

AF XY:

0.0000150

show subpopulations

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:

0.00000758

AC:

AN:

1450840

Hom.:

Cov.:

AF XY:

0.00000831

AC XY:

AN XY:

722190

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33246

American (AMR)

AF:

0.00

AC:

AN:

44450

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25958

East Asian (EAS)

AF:

0.00

AC:

AN:

39490

South Asian (SAS)

AF:

0.0000582

AC:

AN:

85970

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51598

Middle Eastern (MID)

AF:

0.000174

AC:

AN:

5740

European-Non Finnish (NFE)

AF:

9.05e-7

AC:

AN:

1104428

Other (OTH)

AF:

0.0000667

AC:

AN:

59960

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.452

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00000662

AC:

AN:

151164

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

73888

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41196

American (AMR)

AF:

0.00

AC:

AN:

15252

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5118

South Asian (SAS)

AF:

0.00

AC:

AN:

4770

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10312

Middle Eastern (MID)

AF:

0.00342

AC:

AN:

292

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67758

Other (OTH)

AF:

0.00

AC:

AN:

2102

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

ExAC

AF:

0.00000827

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Congenital myasthenic syndrome 8

Uncertain:1

Feb 03, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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 output the following: SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0". The proline amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. This variant has not been reported in the literature in individuals affected with AGRN-related conditions. This variant is present in population databases (rs144781935, gnomAD 0.007%). This sequence change replaces alanine, which is neutral and non-polar, with proline, which is neutral and non-polar, at codon 1012 of the AGRN protein (p.Ala1012Pro). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Benign

-0.42

BayesDel_noAF

Benign

-0.66

CADD

Benign

0.37

(source)

DANN

Benign

0.30

Eigen

Benign

-1.8

Eigen_PC

Benign

-1.8

FATHMM_MKL

Benign

0.0045

LIST_S2

Benign

0.48

T;T

M_CAP

Benign

0.037

MetaRNN

Benign

0.045

T;T

MetaSVM

Benign

-0.99

MutationAssessor

Benign

-1.4

N;.

PhyloP100

-0.10

PrimateAI

Benign

0.32

PROVEAN

Benign

0.14

N;.

REVEL

Benign

0.060

Sift

Benign

0.35

T;.

Sift4G

Benign

0.72

T;T

Vest4

0.066

MutPred

0.22

Gain of glycosylation at A1012 (P = 0.0155);.;

MVP

0.51

MPC

0.52

ClinPred

0.044

GERP RS

-5.1

gMVP

0.21

Mutation Taster

=98/2

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over