1-24331548-T-C

Position:

• chr1-24331548-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 8P and 4B. PVS1 BS2

The ENST00000356046.6(GRHL3):​c.2T>C​(p.Met1?) variant causes a start lost change. The variant allele was found at a frequency of 0.00000821 in 1,461,850 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000082 (0 hom.)
• Consequence: GRHL3 ENST00000356046.6 start_lost
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 6.17

Genes affected

GRHL3 (HGNC:25839): (grainyhead like transcription factor 3) This gene encodes a member of the grainyhead family of transcription factors. The encoded protein may function as a transcription factor during development, and has been shown to stimulate migration of endothelial cells. Multiple transcript variants encoding distinct isoforms have been identified for this gene.[provided by RefSeq, Aug 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PVS1: Start lost variant, no new inframe start found.
• BS2: High AC in GnomAdExome4 at 12 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GRHL3	NM_198173.3	c.140T>C	p.Met47Thr	missense_variant	2/16	ENST00000361548.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GRHL3	ENST00000361548.9	c.140T>C	p.Met47Thr	missense_variant	2/16	1	NM_198173.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000199 AC: 5 AN: 251418 Hom.: 0 AF XY: 0.0000147 AC XY: 2 AN XY: 135886

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000217

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000821 AC: 12 AN: 1461850 Hom.: 0 Cov.: 31 AF XY: 0.00000550 AC XY: 4 AN XY: 727230

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000176

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.0000497

GnomAD4 genome Cov.: 32

Bravo AF: 0.0000113

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Dec 20, 2018

The p.Met47Thr (NM_198174.2: c.140T>C) variant in GRHL3 has not been previously reported in affected individuals, but has been identified in 0.02% (4/18394) of East Asian chromosomes by gnomAD (http://gnomad.broadinstitute.org). Computation al prediction tools and conservation analysis do not provide strong support for or against an impact of the p.Met47Thr change to the protein. It should be noted that the methionine (Met) residue impacted by this variant represents the trans lation start site of an alternative GRHL3 transcript (NM_001195010.1:c.2T>C, p.M et1?). However, the NM_001195010.1 transcript is poorly expressed (see ENST00000 356046.6 in GTEx; https://gtexportal.org/) and a second Met is present at the ne ighboring residue (p.Met2). As a result, the predicted start site impact is less likely to have biological significance. In summary, the clinical significance o f the p.Met47Thr variant is uncertain. ACMG/AMP Criteria applied: BS1_Supporting . -

GRHL3-related disorder Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Jun 21, 2024

The GRHL3 c.2T>C variant is predicted to disrupt the translation initiation site (Start Loss). In the canonical transcript NM_198174 is this variant annotated as p.Met47Thr. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.022% of alleles in individuals of East Asian descent in gnomAD. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 15, 2023

The c.140T>C (p.M47T) alteration is located in exon 2 (coding exon 2) of the GRHL3 gene. This alteration results from a T to C substitution at nucleotide position 140, causing the methionine (M) at amino acid position 47 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Uncertain	0.025	T
BayesDel_noAF	Uncertain	0.090
CADD	Uncertain	23
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.76	.;D;.;.;.
Eigen	Uncertain	0.41
Eigen_PC	Uncertain	0.53
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	1.0	D;D;D;D;D
M_CAP	Benign	0.032	D
MetaRNN	Uncertain	0.50	D;D;D;D;D
MetaSVM	Benign	-0.74	T
MutationAssessor	Uncertain	2.6	M;M;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Pathogenic	0.83	D
PROVEAN	Uncertain	-3.9	D;D;D;D;D
REVEL	Uncertain	0.37
Sift	Uncertain	0.0010	D;D;D;D;D
Sift4G	Uncertain	0.0020	D;D;D;D;D
Polyphen		0.28	.;.;.;.;B
Vest4		0.83
MutPred		0.46		Gain of ubiquitination at K45 (P = 0.0689);Gain of ubiquitination at K45 (P = 0.0689);.;.;.;
MVP		0.33
MPC		0.68
ClinPred		0.48	T
GERP RS		5.9
Varity_R		0.69
gMVP		0.62

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: rs754006408; hg19: chr1-24658038;