rs387907300

Variant names:

• chr3-43080959-C-T
• rs387907300
• NM_032806.6:c.473G>A

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM2 PP3_Moderate PP5

The NM_032806.6(POMGNT2):​c.473G>A​(p.Arg158His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000123 in 1,461,878 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic 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. R158C) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000012 (0 hom.)
• Consequence: POMGNT2 NM_032806.6 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:4 U:1
• Conservation: PhyloP100: 7.89
• Publications: 9 publications found

Genes affected

POMGNT2 (HGNC:25902): (protein O-linked mannose N-acetylglucosaminyltransferase 2 (beta 1,4-)) This gene encodes a protein with glycosyltransferase activity although its function is not currently known. [provided by RefSeq, Sep 2012]

POMGNT2 Gene-Disease associations (from GenCC):

• muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type a, 8

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), Genomics England PanelApp, G2P
• myopathy caused by variation in POMGNT2

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

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.925
• PP5: Variant 3-43080959-C-T is Pathogenic according to our data. Variant chr3-43080959-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 37208.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_032806.6. 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
	POMGNT2	NM_032806.6	MANE Select	c.473G>A	p.Arg158His	missense	Exon 2 of 2	NP_116195.2
	POMGNT2	NM_001437285.1		c.473G>A	p.Arg158His	missense	Exon 3 of 3	NP_001424214.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	POMGNT2	ENST00000344697.3	TSL:1 MANE Select	c.473G>A	p.Arg158His	missense	Exon 2 of 2	ENSP00000344125.2
	POMGNT2	ENST00000441964.1	TSL:4	c.473G>A	p.Arg158His	missense	Exon 3 of 3	ENSP00000408992.1
	POMGNT2	ENST00000686643.1		c.473G>A	p.Arg158His	missense	Exon 4 of 4	ENSP00000509123.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.0000119 AC: 3 AN: 251406 AF XY: 0.0000147

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.0000992

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000880

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.0000123 AC: 18 AN: 1461878 Hom.: 0 Cov.: 37 AF XY: 0.0000124 AC XY: 9 AN XY: 727240

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.0000224 AC: 1 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.0000383 AC: 1 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53412

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.0000135 AC: 15 AN: 1112004

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 33

Alfa AF: 0.00000981 Hom.: 0

ExAC AF: 0.00000824 AC: 1

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

ClinVar submissions as Germline

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
1	1	-	Muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type a, 8 (2)
1	-	-	Muscular dystrophy-dystroglycanopathy (limb-girdle), type C, 8 (1)
1	-	-	Neonatal death;C3278123:Severe hydrocephalus (1)
1	-	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.93
BayesDel_addAF	Pathogenic	0.41	D
BayesDel_noAF	Pathogenic	0.35
CADD	Pathogenic	29
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.23	T
Eigen	Pathogenic	0.89
Eigen_PC	Pathogenic	0.88
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.96	D
M_CAP	Uncertain	0.10	D
MetaRNN	Pathogenic	0.92	D
MetaSVM	Uncertain	0.36	D
MutationAssessor	Benign	1.8	L
PhyloP100		7.9
PrimateAI	Pathogenic	0.82	D
PROVEAN	Benign	-2.3	N
REVEL	Pathogenic	0.93
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.99
MutPred		0.80		Loss of stability (P = 0.1496)
MVP		0.84
MPC		1.0
ClinPred		0.86	D
GERP RS		5.9
Varity_R		0.38
gMVP		0.87
Mutation Taster		=27/73	disease causing (ClinVar)

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: rs387907300; hg19: chr3-43122451; COSMIC: COSV60952517;