Genetic Variant TFAP2B:p.Ser20Thr (chr6-50818858-G-C) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 3P and 6B. PM2PP2BP4_ModerateBS1

The XM_017011233.2(TFAP2B):c.59G>C(p.Ser20Thr) variant causes a missense change. The variant allele was found at a frequency of 0.00000138 in 1,448,956 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 4/5 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

TFAP2B
XM_017011233.2 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 6.23

Publications

21 publications found

Variant links:

Genes affected

TFAP2B (HGNC:11743): (transcription factor AP-2 beta) This gene encodes a member of the AP-2 family of transcription factors. AP-2 proteins form homo- or hetero-dimers with other AP-2 family members and bind specific DNA sequences. They are thought to stimulate cell proliferation and suppress terminal differentiation of specific cell types during embryonic development. Specific AP-2 family members differ in their expression patterns and binding affinity for different promoters. This protein functions as both a transcriptional activator and repressor. Mutations in this gene result in autosomal dominant Char syndrome, suggesting that this gene functions in the differentiation of neural crest cell derivatives. [provided by RefSeq, Jul 2008]

TFAP2B Gene-Disease associations (from GenCC):

Char syndrome
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Orphanet
familial patent arterial duct
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

TFAP2B links:

ENSG00000297125 (HGNC:):

ENSG00000297125 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 8 curated pathogenic missense variants (we use a threshold of 10). The gene has 2 curated benign missense variants. Gene score misZ: 1.2875 (below the threshold of 3.09). Trascript score misZ: 1.5192 (below the threshold of 3.09). GenCC associations: The gene is linked to familial patent arterial duct, Char syndrome.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.43).

BS1

Variant frequency is greater than expected in population mid. GnomAdExome4 allele frequency = 0.00000138 (2/1448956) while in subpopulation MID AF = 0.000348 (2/5742). AF 95% confidence interval is 0.0000612. There are 0 homozygotes in GnomAdExome4. There are 2 alleles in the male GnomAdExome4 subpopulation. Median coverage is 28. This position passed quality control check.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TFAP2B	NM_003221.4 link	c.-34G>C		upstream_gene_variant		ENST00000393655.4	NP_003212.2	Q92481-1

Ensembl

Gene	Transcript	HGVSc	Effect	Exon rank	TSL	MANE	Protein	UniProt
TFAP2B	ENST00000344788.7 link	c.-67G>C	5_prime_UTR_variant	Exon 1 of 4	3		ENSP00000342252.3	X6R4Y8
ENSG00000297125	ENST00000745639.1 link	n.343+44C>G	intron_variant	Intron 1 of 1
TFAP2B	ENST00000393655.4 link	c.-34G>C	upstream_gene_variant		1	NM_003221.4	ENSP00000377265.2	Q92481-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000138

AC:

AN:

1448956

Hom.:

Cov.:

AF XY:

0.00000277

AC XY:

AN XY:

721818

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33218

American (AMR)

AF:

0.00

AC:

AN:

44690

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26066

East Asian (EAS)

AF:

0.00

AC:

AN:

39628

South Asian (SAS)

AF:

0.00

AC:

AN:

85982

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53180

Middle Eastern (MID)

AF:

0.000348

AC:

AN:

5742

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1100482

Other (OTH)

AF:

0.00

AC:

AN:

59968

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.43

CADD

Benign

(source)

DANN

Benign

0.93

PhyloP100

6.2

PromoterAI

-0.013

Neutral

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over