18-55279635-T-G

Variant names:

• chr18-55279635-T-G
• rs753332007
• NM_001083962.2:c.571A>C

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001083962.2(TCF4):​c.571A>C​(p.Thr191Pro) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,686 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T191A) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: TCF4 NM_001083962.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.76
• Publications: 0 publications found

Genes affected

TCF4 (HGNC:11634): (transcription factor 4) This gene encodes transcription factor 4, a basic helix-loop-helix transcription factor. The encoded protein recognizes an Ephrussi-box ('E-box') binding site ('CANNTG') - a motif first identified in immunoglobulin enhancers. This gene is broadly expressed, and may play an important role in nervous system development. Defects in this gene are a cause of Pitt-Hopkins syndrome. In addition, an intronic CTG repeat normally numbering 10-37 repeat units can expand to >50 repeat units and cause Fuchs endothelial corneal dystrophy. Multiple alternatively spliced transcript variants that encode different proteins have been described. [provided by RefSeq, Jul 2016]

TCF4 Gene-Disease associations (from GenCC):

• Pitt-Hopkins syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Orphanet, G2P, ClinGen
• corneal dystrophy, Fuchs endothelial, 3

  Inheritance: AD Classification: STRONG Submitted by: G2P
• autosomal dominant non-syndromic intellectual disability

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Fuchs' endothelial dystrophy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• autism spectrum disorder

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
• intellectual disability

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.34030002).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001083962.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TCF4	NM_001083962.2	MANE Select	c.571A>C	p.Thr191Pro	missense	Exon 9 of 20	NP_001077431.1
	TCF4	NM_001243226.3		c.877A>C	p.Thr293Pro	missense	Exon 10 of 21	NP_001230155.2
	TCF4	NM_001243228.2		c.589A>C	p.Thr197Pro	missense	Exon 9 of 20	NP_001230157.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TCF4	ENST00000354452.8	TSL:5 MANE Select	c.571A>C	p.Thr191Pro	missense	Exon 9 of 20	ENSP00000346440.3
	TCF4	ENST00000398339.5	TSL:1	c.877A>C	p.Thr293Pro	missense	Exon 10 of 21	ENSP00000381382.1
	TCF4	ENST00000356073.8	TSL:1	c.571A>C	p.Thr191Pro	missense	Exon 9 of 20	ENSP00000348374.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461686 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727152

African (AFR) AF: 0.00 AC: 0 AN: 33462

American (AMR) AF: 0.00 AC: 0 AN: 44716

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26128

East Asian (EAS) AF: 0.00 AC: 0 AN: 39690

South Asian (SAS) AF: 0.00 AC: 0 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53416

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111872

Other (OTH) AF: 0.0000166 AC: 1 AN: 60380

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.089
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.10
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.029	T
Eigen	Uncertain	0.46
Eigen_PC	Uncertain	0.51
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.94	D
M_CAP	Benign	0.031	D
MetaRNN	Benign	0.34	T
MetaSVM	Benign	-0.93	T
MutationAssessor	Benign	1.6	L
PhyloP100		3.8
PrimateAI	Uncertain	0.79	T
PROVEAN	Benign	-1.4	N
REVEL	Benign	0.23
Sift	Benign	0.039	D
Sift4G	Benign	0.088	T
Polyphen		0.99	D
Vest4		0.59
MutPred		0.13		Loss of phosphorylation at T293 (P = 0.0098)
MVP		0.73
MPC		1.7
ClinPred		0.85	D
GERP RS		5.4
Varity_R		0.51
gMVP		0.64
Mutation Taster		=8/92	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: rs753332007; hg19: chr18-52946866;