1-209790666-C-T

Position:

• chr1-209790666-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2 PP2 PP3_Moderate PP5_Moderate

The NM_006147.4(IRF6):​c.889G>A​(p.Val297Ile) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: IRF6 NM_006147.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.39

Genes affected

IRF6 (HGNC:6121): (interferon regulatory factor 6) This gene encodes a member of the interferon regulatory transcription factor (IRF) family. Family members share a highly-conserved N-terminal helix-turn-helix DNA-binding domain and a less conserved C-terminal protein-binding domain. The encoded protein may be a transcriptional activator. Mutations in this gene can cause van der Woude syndrome and popliteal pterygium syndrome. Mutations in this gene are also associated with non-syndromic orofacial cleft type 6. Alternate splicing results in multiple transcript variants.[provided by RefSeq, May 2011]

ACMG classification

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), IRF6. . Gene score misZ 2.7435 (greater than the threshold 3.09). Trascript score misZ 3.8897 (greater than threshold 3.09). GenCC has associacion of gene with orofacial cleft 6, susceptibility to, van der Woude syndrome, autosomal dominant popliteal pterygium syndrome, tooth agenesis, van der Woude syndrome 1.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.872
• PP5: Variant 1-209790666-C-T is Pathogenic according to our data. Variant chr1-209790666-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 533111.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
IRF6	NM_006147.4	c.889G>A	p.Val297Ile	missense_variant	7/9	ENST00000367021.8	NP_006138.1
IRF6	NM_001206696.2	c.604G>A	p.Val202Ile	missense_variant	5/7		NP_001193625.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
IRF6	ENST00000367021.8	c.889G>A	p.Val297Ile	missense_variant	7/9	1	NM_006147.4	ENSP00000355988	P1
IRF6	ENST00000542854.5	c.604G>A	p.Val202Ile	missense_variant	5/7	2		ENSP00000440532
IRF6	ENST00000643798.1	c.*399G>A		3_prime_UTR_variant, NMD_transcript_variant	7/9			ENSP00000496669
IRF6	ENST00000696134.1	c.*316G>A		3_prime_UTR_variant, NMD_transcript_variant	7/9			ENSP00000512427

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Van der Woude syndrome;C0265259:Popliteal pterygium syndrome;C1837213:Orofacial cleft 6, susceptibility to Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 02, 2024

This sequence change replaces valine, which is neutral and non-polar, with isoleucine, which is neutral and non-polar, at codon 297 of the IRF6 protein (p.Val297Ile). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individuals with van der Woude syndrome (PMID: 12219090; Invitae). ClinVar contains an entry for this variant (Variation ID: 533111). 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 expected to disrupt IRF6 protein function with a positive predictive value of 80%. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.31
BayesDel_addAF	Pathogenic	0.32	D
BayesDel_noAF	Pathogenic	0.22
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.62	.;D
Eigen	Pathogenic	0.78
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.93	D;D
M_CAP	Pathogenic	0.54	D
MetaRNN	Pathogenic	0.87	D;D
MetaSVM	Pathogenic	0.80	D
MutationAssessor	Benign	1.8	.;L
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.75	T
PROVEAN	Benign	-0.50	N;N
REVEL	Uncertain	0.58
Sift	Benign	0.24	T;T
Sift4G	Uncertain	0.016	D;T
Polyphen		1.0	.;D
Vest4		0.80
MutPred		0.56		.;Gain of ubiquitination at K293 (P = 0.1375);
MVP		0.92
MPC		1.4
ClinPred		0.93	D
GERP RS		6.2
Varity_R		0.40
gMVP		0.41

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: rs779827384; hg19: chr1-209964011; COSMIC: COSV65418816; COSMIC: COSV65418816;