chr1-209788556-A-C

Variant names:

• chr1-209788556-A-C
• rs1553247592
• NM_006147.4:c.1268T>G

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM2 PP2 PP3_Moderate PP5_Moderate

The NM_006147.4(IRF6):​c.1268T>G​(p.Ile423Ser) 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 Pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: IRF6 NM_006147.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 8.64
• Publications: 0 publications found

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]

IRF6 Gene-Disease associations (from GenCC):

• autosomal dominant popliteal pterygium syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Labcorp Genetics (formerly Invitae)
• IRF6-related condition

  Inheritance: AD Classification: DEFINITIVE Submitted by: Ambry Genetics
• van der Woude syndrome 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• popliteal pterygium syndrome

  Inheritance: AD Classification: STRONG Submitted by: Ambry Genetics
• tooth agenesis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• van der Woude syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• orofacial cleft 6, susceptibility to

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ENSG00000289700 (HGNC:):

ACMG classification

Our verdict: Likely_pathogenic. The variant received 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the IRF6 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 45 curated pathogenic missense variants (we use a threshold of 10). The gene has 10 curated benign missense variants. Gene score misZ: 2.7435 (below the threshold of 3.09). Trascript score misZ: 3.8897 (above the threshold of 3.09). GenCC associations: The gene is linked to van der Woude syndrome 1, van der Woude syndrome, autosomal dominant popliteal pterygium syndrome, orofacial cleft 6, susceptibility to, tooth agenesis, IRF6-related condition, popliteal pterygium syndrome.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.903
• PP5: Variant 1-209788556-A-C is Pathogenic according to our data. Variant chr1-209788556-A-C is described in ClinVar as Pathogenic. ClinVar VariationId is 464462.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IRF6	NM_006147.4	c.1268T>G	p.Ile423Ser	missense_variant	Exon 9 of 9	ENST00000367021.8	NP_006138.1
IRF6	NM_001206696.2	c.983T>G	p.Ile328Ser	missense_variant	Exon 7 of 7		NP_001193625.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IRF6	ENST00000367021.8	c.1268T>G	p.Ile423Ser	missense_variant	Exon 9 of 9	1	NM_006147.4	ENSP00000355988.3
ENSG00000289700	ENST00000696133.1	c.1268T>G	p.Ile423Ser	missense_variant	Exon 9 of 10			ENSP00000512426.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: 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

Oct 21, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces isoleucine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 423 of the IRF6 protein (p.Ile423Ser). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with clinical features of IRF6-related conditions (internal data). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 464462). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is expected to disrupt IRF6 protein function with a positive predictive value of 80%. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.54	D
BayesDel_noAF	Pathogenic	0.53
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.76	.;D
Eigen	Uncertain	0.66
Eigen_PC	Uncertain	0.62
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.96	D;D
M_CAP	Pathogenic	0.86	D
MetaRNN	Pathogenic	0.90	D;D
MetaSVM	Pathogenic	0.86	D
MutationAssessor	Uncertain	2.7	.;M
PhyloP100		8.6
PrimateAI	Pathogenic	0.88	D
PROVEAN	Uncertain	-3.9	D;N
REVEL	Pathogenic	0.80
Sift	Uncertain	0.0010	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	.;D
Vest4		0.91
MutPred		0.54		.;Gain of disorder (P = 0.0014);
MVP		0.99
MPC		2.0
ClinPred		1.0	D
GERP RS		4.3
Varity_R		0.46
gMVP		0.94
Mutation Taster		=18/82	disease causing

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

Other links and lift over

dbSNP: rs1553247592; hg19: chr1-209961901;