2-165747998-T-C

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BS1 BS2

The NM_004482.4(GALNT3):c.*783A>G variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00856 in 177,222 control chromosomes in the GnomAD database, including 24 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.0097 (23 hom., cov: 32)
  • Exomes 𝑓: 0.0016 (1 hom.)
• Consequence: GALNT3 NM_004482.4 3_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -1.29

Genes affected

GALNT3 (HGNC:4125): (polypeptide N-acetylgalactosaminyltransferase 3) This gene encodes UDP-GalNAc transferase 3, a member of the GalNAc-transferases family. This family transfers an N-acetyl galactosamine to the hydroxyl group of a serine or threonine residue in the first step of O-linked oligosaccharide biosynthesis. Individual GalNAc-transferases have distinct activities and initiation of O-glycosylation is regulated by a repertoire of GalNAc-transferases. The protein encoded by this gene is highly homologous to other family members, however the enzymes have different substrate specificities. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.47).
• BP6: Variant 2-165747998-T-C is Benign according to our data. Variant chr2-165747998-T-C is described in ClinVar as [Benign]. Clinvar id is 331773.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00971 (1477/152140) while in subpopulation AFR AF= 0.0339 (1406/41532). AF 95% confidence interval is 0.0324. There are 23 homozygotes in gnomad4. There are 692 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd at 22 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GALNT3	NM_004482.4	c.*783A>G		3_prime_UTR_variant	11/11	ENST00000392701.8
GALNT3	XM_005246449.2	c.*783A>G		3_prime_UTR_variant	11/11
GALNT3	XM_011510929.2	c.*783A>G		3_prime_UTR_variant	11/11
GALNT3	XM_017003770.2	c.*783A>G		3_prime_UTR_variant	11/11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GALNT3	ENST00000392701.8	c.*783A>G		3_prime_UTR_variant	11/11	1	NM_004482.4	P1
GALNT3	ENST00000409882.5	c.*783A>G		3_prime_UTR_variant	8/8	1

Frequencies

GnomAD3 genomes AF: 0.00960 AC: 1459 AN: 152022 Hom.: 22 Cov.: 32

Gnomad AFR AF: 0.0335

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00380

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00480

GnomAD4 exome AF: 0.00159 AC: 40 AN: 25082 Hom.: 1 Cov.: 0 AF XY: 0.00122 AC XY: 14 AN XY: 11480

Gnomad4 AFR exome AF: 0.0378

Gnomad4 AMR exome AF: 0.00174

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000702

Gnomad4 OTH exome AF: 0.00290

GnomAD4 genome AF: 0.00971 AC: 1477 AN: 152140 Hom.: 23 Cov.: 32 AF XY: 0.00930 AC XY: 692 AN XY: 74374

Gnomad4 AFR AF: 0.0339

Gnomad4 AMR AF: 0.00380

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00475

Alfa AF: 0.00144 Hom.: 0

Bravo AF: 0.0111

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Tumoral calcinosis, hyperphosphatemic, familial, 1 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.47
Cadd	Benign	8.8
Dann	Benign	0.85

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: rs115493554; hg19: chr2-166604508;