chr14-77298781-G-A

Position:

• chr14-77298781-G-A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_013382.7(POMT2):​c.924-10C>T variant causes a splice polypyrimidine tract, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000497 in 1,610,696 control chromosomes in the GnomAD database, including 7 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0024 (2 hom., cov: 33)
  • Exomes 𝑓: 0.00029 (5 hom.)
• Consequence: POMT2 NM_013382.7 splice_polypyrimidine_tract, intron
• Scores: Splicing: ADA: 0.00001381
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: 0.949

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]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.86).
• BP6: Variant 14-77298781-G-A is Benign according to our data. Variant chr14-77298781-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 95545.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr14-77298781-G-A is described in Lovd as [Likely_benign].
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00244 (372/152394) while in subpopulation AFR AF= 0.00827 (344/41594). AF 95% confidence interval is 0.00755. There are 2 homozygotes in gnomad4. There are 187 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
POMT2	NM_013382.7	c.924-10C>T		splice_polypyrimidine_tract_variant, intron_variant		ENST00000261534.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
POMT2	ENST00000261534.9	c.924-10C>T		splice_polypyrimidine_tract_variant, intron_variant		1	NM_013382.7	P1

Frequencies

GnomAD3 genomes AF: 0.00244 AC: 372 AN: 152276 Hom.: 2 Cov.: 33

Gnomad AFR AF: 0.00827

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00105

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00633

Gnomad NFE AF: 0.0000735

Gnomad OTH AF: 0.00239

GnomAD3 exomes AF: 0.000716 AC: 175 AN: 244584 Hom.: 1 AF XY: 0.000545 AC XY: 72 AN XY: 132028

Gnomad AFR exome AF: 0.00898

Gnomad AMR exome AF: 0.000735

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000678

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000454

Gnomad OTH exome AF: 0.000499

GnomAD4 exome AF: 0.000293 AC: 428 AN: 1458302 Hom.: 5 Cov.: 31 AF XY: 0.000263 AC XY: 191 AN XY: 725104

Gnomad4 AFR exome AF: 0.00898

Gnomad4 AMR exome AF: 0.000790

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000351

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000207

Gnomad4 OTH exome AF: 0.000946

GnomAD4 genome AF: 0.00244 AC: 372 AN: 152394 Hom.: 2 Cov.: 33 AF XY: 0.00251 AC XY: 187 AN XY: 74518

Gnomad4 AFR AF: 0.00827

Gnomad4 AMR AF: 0.00105

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000735

Gnomad4 OTH AF: 0.00236

Alfa AF: 0.00197 Hom.: 0

Bravo AF: 0.00288

Asia WGS AF: 0.00231 AC: 8 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:4

Likely benign, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Jul 25, 2014	- -
Benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Oct 17, 2012	- -
Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Jul 17, 2020	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Dec 26, 2017	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A2;C3150416:Muscular dystrophy-dystroglycanopathy (congenital with intellectual disability), type B2;C3150418:Autosomal recessive limb-girdle muscular dystrophy type 2N Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Jan 27, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.86
CADD	Benign	2.5
DANN	Benign	0.48

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000014
dbscSNV1_RF	Benign	0.0020
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

Publications

LitVar

Other links and lift over

dbSNP: rs142122657; hg19: chr14-77765124;