chr14-77275402-C-T

Position:

• chr14-77275402-C-T

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The NM_013382.7(POMT2):​c.*1974G>A variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.414 in 151,802 control chromosomes in the GnomAD database, including 14,693 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.41 (14681 hom., cov: 32)
  • Exomes 𝑓: 0.56 (12 hom.)
• Consequence: POMT2 NM_013382.7 3_prime_UTR
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: 0.0290

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=-0.85).
• BP6: Variant 14-77275402-C-T is Benign according to our data. Variant chr14-77275402-C-T is described in ClinVar as [Benign]. Clinvar id is 314514.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.525 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
POMT2	NM_013382.7	c.*1974G>A		3_prime_UTR_variant	21/21	ENST00000261534.9	NP_037514.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
POMT2	ENST00000261534.9	c.*1974G>A		3_prime_UTR_variant	21/21	1	NM_013382.7	ENSP00000261534	P1

Frequencies

GnomAD3 genomes AF: 0.414 AC: 62784 AN: 151594 Hom.: 14665 Cov.: 32

Gnomad AFR AF: 0.200

Gnomad AMI AF: 0.499

Gnomad AMR AF: 0.346

Gnomad ASJ AF: 0.455

Gnomad EAS AF: 0.442

Gnomad SAS AF: 0.402

Gnomad FIN AF: 0.583

Gnomad MID AF: 0.419

Gnomad NFE AF: 0.530

Gnomad OTH AF: 0.411

GnomAD4 exome AF: 0.558 AC: 48 AN: 86 Hom.: 12 Cov.: 0 AF XY: 0.571 AC XY: 40 AN XY: 70

Gnomad4 AFR exome AF: 0.500

Gnomad4 AMR exome AF: 0.500

Gnomad4 ASJ exome AF: 0.500

Gnomad4 SAS exome AF: 0.500

Gnomad4 NFE exome AF: 0.569

Gnomad4 OTH exome AF: 0.500

GnomAD4 genome AF: 0.414 AC: 62819 AN: 151716 Hom.: 14681 Cov.: 32 AF XY: 0.416 AC XY: 30864 AN XY: 74132

Gnomad4 AFR AF: 0.200

Gnomad4 AMR AF: 0.345

Gnomad4 ASJ AF: 0.455

Gnomad4 EAS AF: 0.443

Gnomad4 SAS AF: 0.403

Gnomad4 FIN AF: 0.583

Gnomad4 NFE AF: 0.530

Gnomad4 OTH AF: 0.417

Alfa AF: 0.490 Hom.: 2476

Bravo AF: 0.387

Asia WGS AF: 0.442 AC: 1537 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Autosomal recessive limb-girdle muscular dystrophy type 2N Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

not provided Benign:1

Benign, criteria provided, single submitter

not provided

Breakthrough Genomics, Breakthrough Genomics

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
CADD	Benign	3.4
DANN	Benign	0.65

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

Publications

LitVar

Other links and lift over

dbSNP: rs11159254; hg19: chr14-77741745;