14-49622036-T-G

Variant names:

• chr14-49622036-T-G
• rs77872234
• NM_002408.4:c.768T>G

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BS1 BS2

The NM_002408.4(MGAT2):​c.768T>G​(p.Leu256Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00098 in 1,613,998 control chromosomes in the GnomAD database, including 15 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0011 (2 hom., cov: 33)
  • Exomes 𝑓: 0.00097 (13 hom.)
• Consequence: MGAT2 NM_002408.4 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: 0.219

Genes affected

MGAT2 (HGNC:7045): (alpha-1,6-mannosyl-glycoprotein 2-beta-N-acetylglucosaminyltransferase) The product of this gene is a Golgi enzyme catalyzing an essential step in the conversion of oligomannose to complex N-glycans. The enzyme has the typical glycosyltransferase domains: a short N-terminal cytoplasmic domain, a hydrophobic non-cleavable signal-anchor domain, and a C-terminal catalytic domain. Mutations in this gene may lead to carbohydrate-deficient glycoprotein syndrome, type II. The coding region of this gene is intronless. Transcript variants with a spliced 5' UTR may exist, but their biological validity has not been determined. [provided by RefSeq, Jul 2008]

ENSG00000258377 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.55).
• BP6: Variant 14-49622036-T-G is Benign according to our data. Variant chr14-49622036-T-G is described in ClinVar as [Likely_benign]. Clinvar id is 461189.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=0.219 with no splicing effect.
• BS1: Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.0011 (168/152108) while in subpopulation EAS AF= 0.0182 (94/5170). AF 95% confidence interval is 0.0152. There are 2 homozygotes in gnomad4. There are 118 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MGAT2	NM_002408.4	c.768T>G	p.Leu256Leu	synonymous_variant	Exon 1 of 1	ENST00000305386.4	NP_002399.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MGAT2	ENST00000305386.4	c.768T>G	p.Leu256Leu	synonymous_variant	Exon 1 of 1	6	NM_002408.4	ENSP00000307423.2
ENSG00000258377	ENST00000555043.1	n.1445A>C		non_coding_transcript_exon_variant	Exon 1 of 2	2

Frequencies

GnomAD3 genomes AF: 0.00112 AC: 170 AN: 151990 Hom.: 2 Cov.: 33

Gnomad AFR AF: 0.0000242

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.0183

Gnomad SAS AF: 0.00145

Gnomad FIN AF: 0.00481

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000221

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.00232 AC: 584 AN: 251464 Hom.: 6 AF XY: 0.00221 AC XY: 301 AN XY: 135912

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000231

Gnomad ASJ exome AF: 0.000198

Gnomad EAS exome AF: 0.0214

Gnomad SAS exome AF: 0.000915

Gnomad FIN exome AF: 0.00554

Gnomad NFE exome AF: 0.000229

Gnomad OTH exome AF: 0.000978

GnomAD4 exome AF: 0.000967 AC: 1414 AN: 1461890 Hom.: 13 Cov.: 32 AF XY: 0.000965 AC XY: 702 AN XY: 727248

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000201

Gnomad4 ASJ exome AF: 0.000191

Gnomad4 EAS exome AF: 0.0210

Gnomad4 SAS exome AF: 0.000835

Gnomad4 FIN exome AF: 0.00599

Gnomad4 NFE exome AF: 0.0000926

Gnomad4 OTH exome AF: 0.00106

GnomAD4 genome AF: 0.00110 AC: 168 AN: 152108 Hom.: 2 Cov.: 33 AF XY: 0.00159 AC XY: 118 AN XY: 74396

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.0000655

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.0182

Gnomad4 SAS AF: 0.00125

Gnomad4 FIN AF: 0.00481

Gnomad4 NFE AF: 0.000221

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000319 Hom.: 0

Bravo AF: 0.00117

Asia WGS AF: 0.00779 AC: 27 AN: 3478

EpiCase AF: 0.000164

EpiControl AF: 0.000119

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

MGAT2-congenital disorder of glycosylation Benign:2

Oct 22, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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 likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

not provided Benign:1

Mar 22, 2018

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.55
CADD	Benign	14
DANN	Benign	0.86
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

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: rs77872234; hg19: chr14-50088754; COSMIC: COSV100023435; COSMIC: COSV100023435;