Genetic Variant GALNT12:c.-2G>A (chr9-98807697-G-A) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_024642.5(GALNT12):c.-2G>A variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000101 in 990,658 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000010 ( 0 hom. )

Consequence

GALNT12
NM_024642.5 5_prime_UTR

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 3.37

Publications

0 publications found

Variant links:

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]

GALNT12 Gene-Disease associations (from GenCC):

colorectal cancer, susceptibility to, 1
Inheritance: AD Classification: LIMITED Submitted by: ClinGen, Ambry Genetics, Labcorp Genetics (formerly Invitae)

GALNT12 links:

ENSG00000285706 (HGNC:):

ENSG00000285706 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.5).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GALNT12	NM_024642.5 link	c.-2G>A		5_prime_UTR_variant	Exon 1 of 10	ENST00000375011.4	NP_078918.3	Q8IXK2-1
LOC124902229	XR_007061689.1 link	n.-117C>T		upstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GALNT12	ENST00000375011.4 link	c.-2G>A		5_prime_UTR_variant	Exon 1 of 10	1	NM_024642.5	ENSP00000364150.3		Q8IXK2-1
ENSG00000285706	ENST00000647710.1 link	n.-133C>T		upstream_gene_variant

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000101

AC:

AN:

990658

Hom.:

Cov.:

AF XY:

0.00000212

AC XY:

AN XY:

472634

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

19230

American (AMR)

AF:

0.00

AC:

AN:

5224

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

9860

East Asian (EAS)

AF:

0.00

AC:

AN:

15142

South Asian (SAS)

AF:

0.00

AC:

AN:

24166

European-Finnish (FIN)

AF:

0.00

AC:

AN:

13838

Middle Eastern (MID)

AF:

0.00

AC:

AN:

2372

European-Non Finnish (NFE)

AF:

0.00000116

AC:

AN:

864654

Other (OTH)

AF:

0.00

AC:

AN:

36172

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.225

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Apr 21, 2022

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.-2G>A variant is located in the 5' untranslated region (5’ UTR) of the GALNT12 gene. This variant results from a G to A substitution 2 bases upstream from the first translated codon. This nucleotide position is highly conserved in available vertebrate species. The evidence for this gene-disease relationship is limited; therefore, the clinical significance of this alteration is unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.50

CADD

Benign

(source)

DANN

Benign

0.92

PhyloP100

3.4

PromoterAI

-0.12

Neutral

(source)

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over