chr2-69320725-T-C

Position:

• chr2-69320725-T-C

Variant summary

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

The NM_001244710.2(GFPT1):​c.*5464A>G variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00368 in 151,936 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.0037 (2 hom., cov: 32)
  • Exomes 𝑓: 0.042 (0 hom.)
• Consequence: GFPT1 NM_001244710.2 3_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.264

Genes affected

GFPT1 (HGNC:4241): (glutamine--fructose-6-phosphate transaminase 1) This gene encodes the first and rate-limiting enzyme of the hexosamine pathway and controls the flux of glucose into the hexosamine pathway. The product of this gene catalyzes the formation of glucosamine 6-phosphate. [provided by RefSeq, Sep 2008]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.92).
• BA1: GnomAdExome4 highest subpopulation (NFE) allele frequency = 0.0625 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GFPT1	NM_001244710.2	c.*5464A>G		3_prime_UTR_variant	20/20	ENST00000357308.9
GFPT1	NM_002056.4	c.*5464A>G		3_prime_UTR_variant	19/19
GFPT1	XM_017003801.2	c.*5464A>G		3_prime_UTR_variant	20/20
GFPT1	XM_017003802.3	c.*5464A>G		3_prime_UTR_variant	19/19

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GFPT1	ENST00000357308.9	c.*5464A>G		3_prime_UTR_variant	20/20	5	NM_001244710.2
GFPT1	ENST00000361060.5	c.*5464A>G		3_prime_UTR_variant	19/19	1		P1

Frequencies

GnomAD3 genomes AF: 0.00366 AC: 556 AN: 151796 Hom.: 2 Cov.: 32

Gnomad AFR AF: 0.00136

Gnomad AMI AF: 0.00879

Gnomad AMR AF: 0.00505

Gnomad ASJ AF: 0.00144

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00104

Gnomad FIN AF: 0.00114

Gnomad MID AF: 0.00949

Gnomad NFE AF: 0.00549

Gnomad OTH AF: 0.00815

GnomAD4 exome AF: 0.0417 AC: 1 AN: 24 Hom.: 0 Cov.: 0 AF XY: 0.0556 AC XY: 1 AN XY: 18

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0625

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.00367 AC: 558 AN: 151912 Hom.: 2 Cov.: 32 AF XY: 0.00325 AC XY: 241 AN XY: 74238

Gnomad4 AFR AF: 0.00135

Gnomad4 AMR AF: 0.00505

Gnomad4 ASJ AF: 0.00144

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00124

Gnomad4 FIN AF: 0.00114

Gnomad4 NFE AF: 0.00549

Gnomad4 OTH AF: 0.00806

Alfa AF: 0.00117 Hom.: 0

Bravo AF: 0.00401

Asia WGS AF: 0.000866 AC: 3 AN: 3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Congenital myasthenic syndrome 12 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

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, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.92
CADD	Benign	1.7
DANN	Benign	0.33

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: rs115361740; hg19: chr2-69547857;