2-165748595-G-A

Position:

• chr2-165748595-G-A

Variant summary

Our verdict is Benign. Variant got -18 ACMG points: 0P and 18B. BP4_Moderate BP6_Very_Strong BS1 BS2

The NM_004482.4(GALNT3):​c.*186C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00208 in 593,424 control chromosomes in the GnomAD database, including 8 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0056 (5 hom., cov: 32)
  • Exomes 𝑓: 0.00087 (3 hom.)
• Consequence: GALNT3 NM_004482.4 3_prime_UTR
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: 3.38

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 -18 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.21).
• BP6: Variant 2-165748595-G-A is Benign according to our data. Variant chr2-165748595-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 894426.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00558 (848/152096) while in subpopulation AFR AF= 0.0194 (807/41518). AF 95% confidence interval is 0.0183. There are 5 homozygotes in gnomad4. There are 400 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 5 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GALNT3	NM_004482.4	c.*186C>T		3_prime_UTR_variant	11/11	ENST00000392701.8
GALNT3	XM_005246449.2	c.*186C>T		3_prime_UTR_variant	11/11
GALNT3	XM_011510929.2	c.*186C>T		3_prime_UTR_variant	11/11
GALNT3	XM_017003770.2	c.*186C>T		3_prime_UTR_variant	11/11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GALNT3	ENST00000392701.8	c.*186C>T		3_prime_UTR_variant	11/11	1	NM_004482.4	P1
GALNT3	ENST00000409882.5	c.*186C>T		3_prime_UTR_variant	8/8	1

Frequencies

GnomAD3 genomes AF: 0.00556 AC: 845 AN: 151976 Hom.: 5 Cov.: 32

Gnomad AFR AF: 0.0194

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00131

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000221

Gnomad OTH AF: 0.00239

GnomAD4 exome AF: 0.000872 AC: 385 AN: 441328 Hom.: 3 Cov.: 5 AF XY: 0.000804 AC XY: 189 AN XY: 235106

Gnomad4 AFR exome AF: 0.0210

Gnomad4 AMR exome AF: 0.00146

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000111

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000175

Gnomad4 OTH exome AF: 0.00143

GnomAD4 genome AF: 0.00558 AC: 848 AN: 152096 Hom.: 5 Cov.: 32 AF XY: 0.00538 AC XY: 400 AN XY: 74352

Gnomad4 AFR AF: 0.0194

Gnomad4 AMR AF: 0.00131

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000221

Gnomad4 OTH AF: 0.00237

Alfa AF: 0.00506 Hom.: 0

Bravo AF: 0.00646

Asia WGS AF: 0.00144 AC: 5 AN: 3476

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

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. -

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

May 25, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.21
CADD	Benign	17
DANN	Benign	0.89

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: rs183674066; hg19: chr2-166605105; COSMIC: COSV105330989;