1-1051352-G-T

Variant names:

• chr1-1051352-G-T
• rs144245019
• NM_198576.4:c.5353G>T

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_198576.4(AGRN):​c.5353G>T​(p.Asp1785Tyr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000658 in 151,944 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/19 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. D1785N) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: AGRN NM_198576.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.0220
• Publications: 8 publications found

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

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.294263).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AGRN	NM_198576.4	c.5353G>T	p.Asp1785Tyr	missense_variant	Exon 31 of 36	ENST00000379370.7	NP_940978.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AGRN	ENST00000379370.7	c.5353G>T	p.Asp1785Tyr	missense_variant	Exon 31 of 36	1	NM_198576.4	ENSP00000368678.2
AGRN	ENST00000651234.1	c.5050G>T	p.Asp1684Tyr	missense_variant	Exon 31 of 38			ENSP00000499046.1
AGRN	ENST00000652369.2	c.5038G>T	p.Asp1680Tyr	missense_variant	Exon 30 of 35			ENSP00000498543.1
AGRN	ENST00000620552.4	c.4951G>T	p.Asp1651Tyr	missense_variant	Exon 32 of 39	5		ENSP00000484607.1

Frequencies

GnomAD3 genomes AF: 0.00000658 AC: 1 AN: 151944 Hom.: 0 Cov.: 33

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: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1414356 Hom.: 0 Cov.: 37 AF XY: 0.00 AC XY: 0 AN XY: 699160

African (AFR) AF: 0.00 AC: 0 AN: 32810

American (AMR) AF: 0.00 AC: 0 AN: 37580

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25268

East Asian (EAS) AF: 0.00 AC: 0 AN: 37760

South Asian (SAS) AF: 0.00 AC: 0 AN: 80550

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 47544

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5392

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1088814

Other (OTH) AF: 0.00 AC: 0 AN: 58638

GnomAD4 genome AF: 0.00000658 AC: 1 AN: 151944 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 74224

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

African (AFR) AF: 0.00 AC: 0 AN: 41390

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

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3468

East Asian (EAS) AF: 0.00 AC: 0 AN: 5172

South Asian (SAS) AF: 0.00 AC: 0 AN: 4826

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10562

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

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 67932

Other (OTH) AF: 0.00 AC: 0 AN: 2092

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Alfa AF: 0.00 Hom.: 9

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.069	T
BayesDel_noAF	Benign	-0.34
CADD	Benign	12
DANN	Benign	0.92
Eigen	Benign	-1.1
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.14	N
LIST_S2	Benign	0.33	T;T
M_CAP	Benign	0.050	D
MetaRNN	Benign	0.29	T;T
MetaSVM	Benign	-1.0	T
PhyloP100		0.022
PrimateAI	Benign	0.42	T
PROVEAN	Benign	-2.2	N;.
REVEL	Benign	0.15
Sift	Benign	0.20	T;.
Sift4G	Benign	0.18	T;T
Vest4		0.51
MVP		0.28
MPC		0.19
ClinPred		0.043	T
GERP RS		-2.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.9
gMVP		0.61
Mutation Taster		=88/12	polymorphism

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: rs144245019; hg19: chr1-986732;