6-10404622-C-G

Variant names:

• chr6-10404622-C-G
• rs1554111768
• NM_001372066.1:c.656G>C

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PM1 PM2 PM5 PP3_Strong

The NM_001372066.1(TFAP2A):​c.656G>C​(p.Arg219Pro) 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. 13/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R219L) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: TFAP2A NM_001372066.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.63
• Publications: 0 publications found

Genes affected

TFAP2A (HGNC:11742): (transcription factor AP-2 alpha) The protein encoded by this gene is a transcription factor that binds the consensus sequence 5'-GCCNNNGGC-3'. The encoded protein functions as either a homodimer or as a heterodimer with similar family members. This protein activates the transcription of some genes while inhibiting the transcription of others. Defects in this gene are a cause of branchiooculofacial syndrome (BOFS). Three transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Dec 2009]

TFAP2A-AS2 (HGNC:52289): (TFAP2A antisense RNA 2) The product of this intronless gene is a capped lncRNA that is nuclear-enriched and associated with chromatin. The encoded transcript may be involved in the regulation of developmental gene expression in a context-dependent manner, functioning as a repressor in non-pluripotent cells and an activator in pluripotent cells. Transcription of this gene is activated in 8-cell human embryos during the major wave of zygotic genome activation, independently of and prior to the activation of TFAP2A, an overlapping gene found on the opposite strand. Expression of this gene is characterized by high cell-to-cell variability in the cells of totipotent human embryos and in stable cell lines. [provided by RefSeq, Mar 2017]

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 2 uncertain in NM_001372066.1
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr6-10404622-C-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 521272.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.989

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TFAP2A	NM_001372066.1	c.656G>C	p.Arg219Pro	missense_variant	Exon 4 of 7	ENST00000379613.10	NP_001358995.1
TFAP2A	NM_001042425.3	c.638G>C	p.Arg213Pro	missense_variant	Exon 4 of 7		NP_001035890.1
TFAP2A	NM_001032280.3	c.632G>C	p.Arg211Pro	missense_variant	Exon 4 of 7		NP_001027451.1
TFAP2A-AS2	NR_145448.1	n.121C>G		non_coding_transcript_exon_variant	Exon 1 of 1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TFAP2A	ENST00000379613.10	c.656G>C	p.Arg219Pro	missense_variant	Exon 4 of 7	1	NM_001372066.1	ENSP00000368933.5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

TFAP2A-related disorder Uncertain:1

Feb 01, 2023

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The TFAP2A c.650G>C variant is predicted to result in the amino acid substitution p.Arg217Pro. To our knowledge, this variant has not been reported in the literature or in a large population database (http://gnomad.broadinstitute.org), indicating this variant is rare. Several nearby amino acid changes (p.Val216Asp, p.Arg219Ser, and p.Arg219Cys) have been reported in individuals with brancio-oculo-facial syndrome (Meshcheryakova et al. 2015. PubMed ID: 25590586; Milunsky. 2011. PubMed ID: 21204207). Although we suspect that this variant may be pathogenic, at this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence.

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.56	D
BayesDel_noAF	Pathogenic	0.57
CADD	Pathogenic	34
DANN	Uncertain	1.0
DEOGEN2	Benign	0.0	.;.;.;D;D;D
Eigen	Pathogenic	0.85
Eigen_PC	Pathogenic	0.77
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.96	D;.;D;D;D;.
M_CAP	Pathogenic	0.94	D
MetaRNN	Pathogenic	0.99	D;D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Benign	0.0	.;.;.;M;.;.
PhyloP100		7.6
PrimateAI	Pathogenic	0.89	D
PROVEAN	Pathogenic	-6.3	D;D;D;D;D;D
REVEL	Pathogenic	0.97
Sift	Pathogenic	0.0	D;D;D;D;D;D
Sift4G	Pathogenic	0.0010	D;D;D;D;D;D
Vest4		0.98
ClinPred		1.0	D
GERP RS		4.6
PromoterAI		-0.039	Neutral
Varity_R		0.94
Mutation Taster		=4/96	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs1554111768; hg19: chr6-10404855;