NM_017739.4:c.70A>C

Variant names:

• chr1-46197752-T-G
• rs766907690
• NM_017739.4:c.70A>C

Variant summary

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

The NM_017739.4(POMGNT1):​c.70A>C​(p.Thr24Pro) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts 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. T24A) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: POMGNT1 NM_017739.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.77
• Publications: 0 publications found

Genes affected

POMGNT1 (HGNC:19139): (protein O-linked mannose N-acetylglucosaminyltransferase 1 (beta 1,2-)) This gene encodes a type II transmembrane protein that resides in the Golgi apparatus. It participates in O-mannosyl glycosylation and is specific for alpha linked terminal mannose. Mutations in this gene may be associated with muscle-eye-brain disease and several congenital muscular dystrophies. Alternatively spliced transcript variants that encode different protein isoforms have been described. [provided by RefSeq, Feb 2014]

POMGNT1 Gene-Disease associations (from GenCC):

• autosomal recessive limb-girdle muscular dystrophy type 2O

  Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE, LIMITED Submitted by: Orphanet, G2P, Ambry Genetics
• muscle-eye-brain disease

  Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: Myriad Women’s Health, Orphanet
• muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A3

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), G2P
• muscular dystrophy-dystroglycanopathy (congenital with intellectual disability), type B3

  Inheritance: AR Classification: DEFINITIVE, LIMITED Submitted by: Ambry Genetics, G2P
• myopathy caused by variation in POMGNT1

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• retinitis pigmentosa 76

  Inheritance: AR Classification: STRONG, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• retinitis pigmentosa

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• congenital muscular dystrophy with cerebellar involvement

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• muscular dystrophy-dystroglycanopathy, type A

  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=0.3606265).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_017739.4. 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
	POMGNT1	NM_017739.4	MANE Select	c.70A>C	p.Thr24Pro	missense	Exon 2 of 22	NP_060209.4	Q8WZA1-1
	POMGNT1	NM_001243766.2		c.70A>C	p.Thr24Pro	missense	Exon 2 of 23	NP_001230695.2	Q8WZA1-2
	POMGNT1	NM_001410783.1		c.70A>C	p.Thr24Pro	missense	Exon 2 of 22	NP_001397712.1	A0A8I5KNB7

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	POMGNT1	ENST00000371984.8	TSL:1 MANE Select	c.70A>C	p.Thr24Pro	missense	Exon 2 of 22	ENSP00000361052.3	Q8WZA1-1
	POMGNT1	ENST00000371992.1	TSL:2	c.70A>C	p.Thr24Pro	missense	Exon 2 of 23	ENSP00000361060.1	Q8WZA1-2
	POMGNT1	ENST00000692369.1		c.70A>C	p.Thr24Pro	missense	Exon 2 of 22	ENSP00000508453.1	A0A8I5KNB7

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000398 AC: 1 AN: 251422 AF XY: 0.00000736

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: 0.000163

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ExAC AF: 0.00000824 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Pathogenic	0.16	D
BayesDel_noAF	Uncertain	0.0
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Benign	0.031	T
Eigen	Benign	0.15
Eigen_PC	Uncertain	0.27
FATHMM_MKL	Uncertain	0.85	D
LIST_S2	Uncertain	0.90	D
M_CAP	Benign	0.039	D
MetaRNN	Benign	0.36	T
MetaSVM	Benign	-0.56	T
MutationAssessor	Benign	1.4	L
PhyloP100		3.8
PrimateAI	Uncertain	0.56	T
PROVEAN	Benign	-1.1	N
REVEL	Uncertain	0.46
Sift	Benign	0.033	D
Sift4G	Benign	0.11	T
Polyphen		0.87	P
Vest4		0.52
MutPred		0.40		Loss of sheet (P = 0.0025)
MVP		0.82
MPC		0.51
ClinPred		0.41	T
GERP RS		4.3
PromoterAI		-0.013	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.2
Varity_R		0.34
gMVP		0.62
Mutation Taster		=67/33	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: rs766907690; hg19: chr1-46663424;