6-42961623-G-A

Position:

• chr6-42961623-G-A

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_018960.6(GNMT):​c.207-589G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0236 in 145,220 control chromosomes in the GnomAD database, including 129 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.024 (129 hom., cov: 28)
• Consequence: GNMT NM_018960.6 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.645

Genes affected

GNMT (HGNC:4415): (glycine N-methyltransferase) The protein encoded by this gene is an enzyme that catalyzes the conversion of S-adenosyl-L-methionine (along with glycine) to S-adenosyl-L-homocysteine and sarcosine. This protein is found in the cytoplasm and acts as a homotetramer. Defects in this gene are a cause of GNMT deficiency (hypermethioninemia). Alternative splicing results in multiple transcript variants. Naturally occurring readthrough transcription occurs between the upstream CNPY3 (canopy FGF signaling regulator 3) gene and this gene and is represented with GeneID:107080644. [provided by RefSeq, Jan 2016]

CNPY3-GNMT (HGNC:):

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.97).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0793 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GNMT	NM_018960.6	c.207-589G>A		intron_variant		ENST00000372808.4
CNPY3-GNMT	NR_134890.2	n.340-1139G>A		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GNMT	ENST00000372808.4	c.207-589G>A		intron_variant		1	NM_018960.6	P1

Frequencies

GnomAD3 genomes AF: 0.0236 AC: 3423 AN: 145112 Hom.: 129 Cov.: 28

Gnomad AFR AF: 0.0819

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0102

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000219

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00352

Gnomad NFE AF: 0.000164

Gnomad OTH AF: 0.0173

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

GnomAD4 genome AF: 0.0236 AC: 3425 AN: 145220 Hom.: 129 Cov.: 28 AF XY: 0.0230 AC XY: 1607 AN XY: 69916

Gnomad4 AFR AF: 0.0817

Gnomad4 AMR AF: 0.0102

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000220

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000164

Gnomad4 OTH AF: 0.0172

Alfa AF: 0.000255 Hom.: 0

Bravo AF: 0.0271

Asia WGS AF: 0.00289 AC: 10 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.97
CADD	Benign	3.8
DANN	Benign	0.58

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: rs58057801; hg19: chr6-42929361;