9-98831816-T-G

Variant names:

• chr9-98831816-T-G
• rs147356342
• NM_024642.5:c.776T>G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PP3_Moderate BS2

The NM_024642.5(GALNT12):​c.776T>G​(p.Val259Gly) variant causes a missense change. The variant allele was found at a frequency of 0.000013 in 1,461,888 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000013 (0 hom.)
• Consequence: GALNT12 NM_024642.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 4.21

Genes affected

GALNT12 (HGNC:19877): (polypeptide N-acetylgalactosaminyltransferase 12) This gene encodes a member of a family of UDP-GalNAc:polypeptide N-acetylgalactosaminyltransferases, which catalyze the transfer of N-acetylgalactosamine (GalNAc) from UDP-GalNAc to a serine or threonine residue on a polypeptide acceptor in the initial step of O-linked protein glycosylation. Mutations in this gene are associated with an increased susceptibility to colorectal cancer.[provided by RefSeq, Mar 2011]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PP3: MetaRNN computational evidence supports a deleterious effect, 0.859
• BS2: High AC in GnomAdExome4 at 19 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GALNT12	NM_024642.5	c.776T>G	p.Val259Gly	missense_variant	Exon 4 of 10	ENST00000375011.4	NP_078918.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GALNT12	ENST00000375011.4	c.776T>G	p.Val259Gly	missense_variant	Exon 4 of 10	1	NM_024642.5	ENSP00000364150.3
GALNT12	ENST00000610463.1	n.*207T>G		non_coding_transcript_exon_variant	Exon 3 of 4	4		ENSP00000477657.1
GALNT12	ENST00000610463.1	n.*207T>G		3_prime_UTR_variant	Exon 3 of 4	4		ENSP00000477657.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.0000130 AC: 19 AN: 1461888 Hom.: 0 Cov.: 32 AF XY: 0.0000110 AC XY: 8 AN XY: 727248

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.0000171

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Uncertain:1

Feb 20, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.V259G variant (also known as c.776T>G), located in coding exon 4 of the GALNT12 gene, results from a T to G substitution at nucleotide position 776. The valine at codon 259 is replaced by glycine, an amino acid with dissimilar properties. This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Colorectal cancer, susceptibility to, 1 Uncertain:1

Jan 11, 2024

Baylor Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Uncertain:1

Jul 06, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ClinVar contains an entry for this variant (Variation ID: 962513). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. This variant has not been reported in the literature in individuals affected with GALNT12-related conditions. This sequence change replaces valine, which is neutral and non-polar, with glycine, which is neutral and non-polar, at codon 259 of the GALNT12 protein (p.Val259Gly). This variant is not present in population databases (gnomAD no frequency). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.61
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.20
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Benign	0.20	T
Eigen	Uncertain	0.66
Eigen_PC	Uncertain	0.63
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.81	T
M_CAP	Uncertain	0.086	D
MetaRNN	Pathogenic	0.86	D
MetaSVM	Benign	-0.35	T
MutationAssessor	Uncertain	2.8	M
PrimateAI	Uncertain	0.68	T
PROVEAN	Pathogenic	-4.7	D
REVEL	Uncertain	0.56
Sift	Uncertain	0.026	D
Sift4G	Uncertain	0.048	D
Polyphen		1.0	D
Vest4		0.69
MutPred		0.58		Loss of stability (P = 0.0299);
MVP		0.91
MPC		0.71
ClinPred		1.0	D
GERP RS		5.7
Varity_R		0.90
gMVP		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: rs147356342; hg19: chr9-101594098;