chr18-3457609-C-G

Position:

chr18-3457609-C-G

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BS1_SupportingBS2

The NM_003244.4(TGIF1):c.488C>G(p.Pro163Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000136 in 1,614,186 control chromosomes in the GnomAD database, including 1 homozygotes. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000033 ( 1 hom., cov: 32)

Exomes 𝑓: 0.000012 ( 0 hom. )

Consequence

TGIF1
NM_003244.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.49

Variant links:

Genes affected

TGIF1 (HGNC:11776): (TGFB induced factor homeobox 1) The protein encoded by this gene is a member of the three-amino acid loop extension (TALE) superclass of atypical homeodomains. TALE homeobox proteins are highly conserved transcription regulators. This particular homeodomain binds to a previously characterized retinoid X receptor responsive element from the cellular retinol-binding protein II promoter. In addition to its role in inhibiting 9-cis-retinoic acid-dependent RXR alpha transcription activation of the retinoic acid responsive element, the protein is an active transcriptional co-repressor of SMAD2 and may participate in the transmission of nuclear signals during development and in the adult. Mutations in this gene are associated with holoprosencephaly type 4, which is a structural anomaly of the brain. Alternative splicing has been observed at this locus and multiple splice variants encoding distinct isoforms are described. [provided by RefSeq, Jul 2013]

TGIF1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -5 ACMG points.

BS1

Variant frequency is greater than expected in population afr. gnomad4_exome allele frequency = 0.0000116 (17/1461886) while in subpopulation AFR AF= 0.000179 (6/33480). AF 95% confidence interval is 0.0000771. There are 0 homozygotes in gnomad4_exome. There are 9 alleles in male gnomad4_exome subpopulation. Median coverage is 31. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High AC in GnomAd4 at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TGIF1	NM_003244.4 linkuse as main transcript	c.488C>G	p.Pro163Arg	missense_variant	3/3	ENST00000343820.10	NP_003235.1	Q15583-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TGIF1	ENST00000343820.10 linkuse as main transcript	c.488C>G	p.Pro163Arg	missense_variant	3/3	1	NM_003244.4	ENSP00000339631.6		Q15583-2

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152182

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.00

GnomAD4 exome

AF:

0.0000116

AC:

AN:

1461886

Hom.:

Cov.:

AF XY:

0.0000124

AC XY:

AN XY:

727246

show subpopulations

Gnomad4 AFR exome

AF:

0.000179

Gnomad4 AMR exome

AF:

0.00

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:

8.99e-7

Gnomad4 OTH exome

AF:

0.000166

GnomAD4 genome

AF:

0.0000328

AC:

AN:

152300

Hom.:

Cov.:

AF XY:

0.0000537

AC XY:

AN XY:

74474

show subpopulations

Gnomad4 AFR

AF:

0.000120

Gnomad4 AMR

AF:

0.00

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:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Holoprosencephaly 4

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 17, 2023

This sequence change replaces proline, which is neutral and non-polar, with arginine, which is basic and polar, at codon 163 of the TGIF1 protein (p.Pro163Arg). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with TGIF1-related conditions. ClinVar contains an entry for this variant (Variation ID: 1402348). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt TGIF1 protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.16

BayesDel_addAF

Uncertain

0.038

BayesDel_noAF

Benign

-0.18

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.31

.;.;.;.;T;.;.;.;.;.;D;.;.;.

Eigen

Uncertain

0.46

Eigen_PC

Uncertain

0.37

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.96

D;.;.;D;D;D;.;D;.;.;D;D;.;.

M_CAP

Benign

0.084

MetaRNN

Uncertain

0.72

D;D;D;D;D;D;D;D;D;D;D;D;D;D

MetaSVM

Uncertain

-0.065

MutationAssessor

Uncertain

2.7

.;.;.;.;.;.;.;.;.;.;M;.;.;.

PrimateAI

Benign

0.48

PROVEAN

Uncertain

-3.2

D;N;.;.;D;N;D;D;N;N;D;D;N;N

REVEL

Benign

0.20

Sift

Uncertain

0.0010

D;D;.;.;D;D;D;D;D;D;D;D;D;D

Sift4G

Uncertain

0.0030

D;D;D;D;D;D;D;D;D;D;D;D;D;D

Polyphen

1.0, 1.0

.;.;.;.;.;.;D;D;.;.;D;.;.;.

Vest4

0.46, 0.46, 0.40, 0.46, 0.45, 0.41, 0.53, 0.49, 0.33, 0.47

MutPred

0.24

.;.;.;.;.;.;.;.;.;.;Loss of glycosylation at P292 (P = 0.0095);.;.;.;

MVP

0.85

MPC

1.2

ClinPred

0.98

GERP RS

4.4

Varity_R

0.54

gMVP

0.73

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

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