chr14-77312990-T-C

Variant names:

• chr14-77312990-T-C
• rs2363640
• NM_013382.7:c.249-957A>G

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_013382.7(POMT2):​c.249-957A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.826 in 152,264 control chromosomes in the GnomAD database, including 52,095 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.83 (52095 hom., cov: 34)
• Consequence: POMT2 NM_013382.7 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.919
• Publications: 3 publications found

Genes affected

POMT2 (HGNC:19743): (protein O-mannosyltransferase 2) The protein encoded by this gene is an O-mannosyltransferase that requires interaction with the product of the POMT1 gene for enzymatic function. The encoded protein is found in the membrane of the endoplasmic reticulum. Defects in this gene are a cause of Walker-Warburg syndrome (WWS).[provided by RefSeq, Oct 2008]

POMT2 Gene-Disease associations (from GenCC):

• muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A2

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• myopathy caused by variation in POMT2

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• muscular dystrophy-dystroglycanopathy (congenital with intellectual disability), type B2

  Inheritance: AR Classification: MODERATE Submitted by: Ambry Genetics
• autosomal recessive limb-girdle muscular dystrophy type 2N

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

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• congenital muscular dystrophy with intellectual disability

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• muscle-eye-brain disease

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

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.93 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
POMT2	NM_013382.7	c.249-957A>G		intron_variant	Intron 1 of 20	ENST00000261534.9	NP_037514.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
POMT2	ENST00000261534.9	c.249-957A>G		intron_variant	Intron 1 of 20	1	NM_013382.7	ENSP00000261534.4

Frequencies

GnomAD3 genomes AF: 0.826 AC: 125609 AN: 152146 Hom.: 52049 Cov.: 34

Gnomad AFR AF: 0.874

Gnomad AMI AF: 0.871

Gnomad AMR AF: 0.741

Gnomad ASJ AF: 0.822

Gnomad EAS AF: 0.951

Gnomad SAS AF: 0.817

Gnomad FIN AF: 0.882

Gnomad MID AF: 0.725

Gnomad NFE AF: 0.797

Gnomad OTH AF: 0.822

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.826 AC: 125710 AN: 152264 Hom.: 52095 Cov.: 34 AF XY: 0.828 AC XY: 61636 AN XY: 74442

African (AFR) AF: 0.874 AC: 36329 AN: 41556

American (AMR) AF: 0.741 AC: 11325 AN: 15290

Ashkenazi Jewish (ASJ) AF: 0.822 AC: 2854 AN: 3470

East Asian (EAS) AF: 0.952 AC: 4940 AN: 5190

South Asian (SAS) AF: 0.816 AC: 3943 AN: 4830

European-Finnish (FIN) AF: 0.882 AC: 9358 AN: 10610

Middle Eastern (MID) AF: 0.718 AC: 211 AN: 294

European-Non Finnish (NFE) AF: 0.797 AC: 54215 AN: 67998

Other (OTH) AF: 0.824 AC: 1741 AN: 2114

Alfa AF: 0.800 Hom.: 61527

Bravo AF: 0.818

Asia WGS AF: 0.888 AC: 3091 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	0.20
DANN	Benign	0.83
PhyloP100		-0.92
Mutation Taster		=100/0	polymorphism (auto)

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: rs2363640; hg19: chr14-77779333;