9-34647868-G-T

Variant summary

Our verdict is Benign. Variant got -15 ACMG points: 2P and 17B. PM2BP4_StrongBP6_Very_StrongBP7BS1

The NM_000155.4(GALT):c.414G>T(p.Thr138=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000305 in 1,614,174 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 Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. T138T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0016 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00017 ( 0 hom. )

Consequence

GALT
NM_000155.4 synonymous

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5

Conservation

PhyloP100: -1.44

Variant links:

Genes affected

GALT (HGNC:4135): (galactose-1-phosphate uridylyltransferase) Galactose-1-phosphate uridyl transferase (GALT) catalyzes the second step of the Leloir pathway of galactose metabolism, namely the conversion of UDP-glucose + galactose-1-phosphate to glucose-1-phosphate + UDP-galactose. The absence of this enzyme results in classic galactosemia in humans and can be fatal in the newborn period if lactose is not removed from the diet. The pathophysiology of galactosemia has not been clearly defined. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Apr 2012]

GALT links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -15 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.77).

BP6

Variant 9-34647868-G-T is Benign according to our data. Variant chr9-34647868-G-T is described in ClinVar as [Likely_benign]. Clinvar id is 280996.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=-1.44 with no splicing effect.

BS1

Variant frequency is greater than expected in population afr. gnomad4_exome allele frequency = 0.000174 (254/1461892) while in subpopulation AFR AF= 0.00681 (228/33480). AF 95% confidence interval is 0.00609. There are 0 homozygotes in gnomad4_exome. There are 100 alleles in male gnomad4_exome subpopulation. Median coverage is 33. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GALT	NM_000155.4 linkuse as main transcript	c.414G>T	p.Thr138=	synonymous_variant	5/11	ENST00000378842.8
GALT	NM_001258332.2 linkuse as main transcript	c.87G>T	p.Thr29=	synonymous_variant	3/9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GALT	ENST00000378842.8 linkuse as main transcript	c.414G>T	p.Thr138=	synonymous_variant	5/11	1	NM_000155.4	P1	P07902-1

Frequencies

GnomAD3 genomes

AF:

0.00156

AC:

238

AN:

152164

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00555

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000458

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000426

AC:

107

AN:

251444

Hom.:

AF XY:

0.000346

AC XY:

AN XY:

135898

show subpopulations

Gnomad AFR exome

AF:

0.00634

Gnomad AMR exome

AF:

0.0000867

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000174

AC:

254

AN:

1461892

Hom.:

Cov.:

AF XY:

0.000138

AC XY:

100

AN XY:

727246

show subpopulations

Gnomad4 AFR exome

AF:

0.00681

Gnomad4 AMR exome

AF:

0.000134

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000180

Gnomad4 OTH exome

AF:

0.000298

GnomAD4 genome

AF:

0.00156

AC:

238

AN:

152282

Hom.:

Cov.:

AF XY:

0.00157

AC XY:

117

AN XY:

74476

show subpopulations

Gnomad4 AFR

AF:

0.00553

Gnomad4 AMR

AF:

0.000458

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000483

Hom.:

Bravo

AF:

0.00176

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:1

Benign, criteria provided, single submitter

clinical testing

Eurofins Ntd Llc (ga)

Sep 25, 2015

- -

GALT-related disorder

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Jun 02, 2020

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Galactosemia

Benign:1

Likely benign, no assertion criteria provided

clinical testing

Natera, Inc.

May 22, 2018

- -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Feb 01, 2017

Variant summary: The GALT c.414G>T (p.Thr138Thr) variant involves the alteration of a non-conserved nucleotide, resulting in a synonymous change. Mutation taster predicts a damaging outcome for this variant, while 1/5 splice prediction tools predict the variant to create a splice donor site. Additionally, ESE finder predicts the creation of SRp40 binding site. However, these predictions are yet to be confirmed by functional studies. This variant was found in 66/121340 control chromosomes, predominantly observed in the African subpopulation at a frequency of 0.006255 (65/10392). This frequency is about 2 times the estimated maximal expected allele frequency of a pathogenic GALT variant (0.0028868), suggesting this is likely a benign polymorphism found primarily in the populations of African origin. In addition, one clinical diagnostic laboratory classified this variant as benign. Taken together, this variant is classified as likely benign. -

Deficiency of UDPglucose-hexose-1-phosphate uridylyltransferase

Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Jan 29, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.77

Cadd

Benign

0.52

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)

0.14

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over