9-98831914-GAG-AA

Position:

• chr9-98831914-GAG-AA

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_024642.5(GALNT12):​c.874_876delinsAA​(p.Glu292LysfsTer26) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GALNT12 NM_024642.5 frameshift
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 5.24

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 Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GALNT12	NM_024642.5	c.874_876delinsAA	p.Glu292LysfsTer26	frameshift_variant	4/10	ENST00000375011.4	NP_078918.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GALNT12	ENST00000375011.4	c.874_876delinsAA	p.Glu292LysfsTer26	frameshift_variant	4/10	1	NM_024642.5	ENSP00000364150	P1
GALNT12	ENST00000610463.1	c.*305_*307delinsAA		3_prime_UTR_variant, NMD_transcript_variant	3/4	4		ENSP00000477657

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Ambry Genetics	Feb 23, 2024	The c.874_876delGAGinsAA variant, located in coding exon 4 of the GALNT12 gene, results from the deletion of 3 nucleotides and insertion of two nucleotides causing a translational frameshift with a predicted alternate stop codon (p.E292Kfs*26). This alteration is expected to result in premature protein truncation or nonsense-mediated mRNA decay. The evidence for this gene-disease relationship is limited; therefore, the clinical significance of this alteration is unclear. -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Aug 16, 2016	This sequence change deletes 3 nucleotide and inserts 2 nucleotides in exon 4 of the GALNT12 mRNA (c.874_876delGAGinsAA), causing a frameshift at codon 292. This creates a premature translational stop signal (p.Glu292Argfs*26) and is expected to result in an absent or disrupted protein product. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a GALNT12-related disease. The current clinical and genetic evidence is not sufficient to establish whether loss-of-function variants in GALNT12 cause disease. Therefore, this variant has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1060502969; hg19: chr9-101594196;