rs1553247592

Positions:

• chr1-209788556-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP2 PP3_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 Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: IRF6 NM_006147.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.64

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]

ENSG00000289700 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 5 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, 0.903

Transcripts

RefSeq

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

Ensembl

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

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

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

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Apr 25, 2017

In summary, this variant is a novel missense change with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive, but these predictions have not been confirmed by published functional studies. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a IRF6-related disease. This sequence change replaces isoleucine with serine at codon 423 of the IRF6 protein (p.Ile423Ser). The isoleucine residue is highly conserved and there is a large physicochemical difference between isoleucine and serine. -

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
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

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: rs1553247592; hg19: chr1-209961901;