3-49510754-G-C

Variant names:

• chr3-49510754-G-C
• rs189360006
• NM_004393.6:c.220G>C

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_004393.6(DAG1):​c.220G>C​(p.Val74Leu) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. 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. V74I) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 31)
• Consequence: DAG1 NM_004393.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.45
• Publications: 0 publications found

Genes affected

DAG1 (HGNC:2666): (dystroglycan 1) This gene encodes dystroglycan, a central component of dystrophin-glycoprotein complex that links the extracellular matrix and the cytoskeleton in the skeletal muscle. The encoded preproprotein undergoes O- and N-glycosylation, and proteolytic processing to generate alpha and beta subunits. Certain mutations in this gene are known to cause distinct forms of muscular dystrophy. Alternative splicing results in multiple transcript variants, all encoding the same protein. [provided by RefSeq, Nov 2015]

DAG1 Gene-Disease associations (from GenCC):

• autosomal recessive limb-girdle muscular dystrophy type 2P

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, G2P
• muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A9

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• neuromuscular disease caused by qualitative or quantitative defects of alpha-dystroglycan

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• muscular dystrophy-dystroglycanopathy, type A

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• isolated asymptomatic elevation of creatine phosphokinase

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004393.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DAG1	NM_004393.6	MANE Select	c.220G>C	p.Val74Leu	missense	Exon 2 of 3	NP_004384.5	Q14118
	DAG1	NM_001165928.4		c.220G>C	p.Val74Leu	missense	Exon 5 of 6	NP_001159400.3	Q14118
	DAG1	NM_001177634.3		c.220G>C	p.Val74Leu	missense	Exon 5 of 6	NP_001171105.2	Q14118

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DAG1	ENST00000308775.7	TSL:1 MANE Select	c.220G>C	p.Val74Leu	missense	Exon 2 of 3	ENSP00000312435.2	Q14118
	DAG1	ENST00000479935.1	TSL:1	n.531G>C		non_coding_transcript_exon	Exon 1 of 2
	DAG1	ENST00000418588.6	TSL:3	c.220G>C	p.Val74Leu	missense	Exon 3 of 4	ENSP00000405859.2	Q14118

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 75

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.65
BayesDel_addAF	Pathogenic	0.20	D
BayesDel_noAF	Uncertain	0.060
CADD	Benign	21
DANN	Uncertain	0.98
DEOGEN2	Uncertain	0.66	D
Eigen	Benign	-0.055
Eigen_PC	Benign	-0.11
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Benign	0.85	T
M_CAP	Pathogenic	0.35	D
MetaRNN	Uncertain	0.58	D
MetaSVM	Uncertain	0.62	D
MutationAssessor	Uncertain	2.5	M
PhyloP100		4.5
PrimateAI	Benign	0.44	T
PROVEAN	Benign	-1.6	N
REVEL	Uncertain	0.54
Sift	Uncertain	0.0070	D
Sift4G	Uncertain	0.0050	D
Polyphen		0.95	P
Vest4		0.67
MutPred		0.63		Loss of sheet (P = 0.0817)
MVP		0.86
MPC		0.35
ClinPred		0.74	D
GERP RS		3.7
Varity_R		0.32
gMVP		0.82
Mutation Taster		=94/6	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: rs189360006; hg19: chr3-49548187;