18-55580920-T-C

Variant names:

• chr18-55580920-T-C
• rs618869
• NM_001083962.2:c.145+4360A>G

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_001083962.2(TCF4):​c.145+4360A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.903 in 151,980 control chromosomes in the GnomAD database, including 62,185 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.90 (62185 hom., cov: 31)
• Consequence: TCF4 NM_001083962.2 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -3.19
• Publications: 10 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: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.99).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.975 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TCF4	NM_001083962.2	c.145+4360A>G		intron_variant	Intron 3 of 19	ENST00000354452.8	NP_001077431.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TCF4	ENST00000354452.8	c.145+4360A>G		intron_variant	Intron 3 of 19	5	NM_001083962.2	ENSP00000346440.3

Frequencies

GnomAD3 genomes AF: 0.903 AC: 137159 AN: 151862 Hom.: 62124 Cov.: 31

Gnomad AFR AF: 0.967

Gnomad AMI AF: 0.857

Gnomad AMR AF: 0.933

Gnomad ASJ AF: 0.816

Gnomad EAS AF: 0.998

Gnomad SAS AF: 0.847

Gnomad FIN AF: 0.886

Gnomad MID AF: 0.892

Gnomad NFE AF: 0.862

Gnomad OTH AF: 0.907

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.903 AC: 137277 AN: 151980 Hom.: 62185 Cov.: 31 AF XY: 0.905 AC XY: 67245 AN XY: 74290

African (AFR) AF: 0.967 AC: 40132 AN: 41500

American (AMR) AF: 0.933 AC: 14236 AN: 15254

Ashkenazi Jewish (ASJ) AF: 0.816 AC: 2829 AN: 3468

East Asian (EAS) AF: 0.998 AC: 5170 AN: 5180

South Asian (SAS) AF: 0.846 AC: 4072 AN: 4814

European-Finnish (FIN) AF: 0.886 AC: 9386 AN: 10590

Middle Eastern (MID) AF: 0.887 AC: 259 AN: 292

European-Non Finnish (NFE) AF: 0.862 AC: 58497 AN: 67862

Other (OTH) AF: 0.908 AC: 1916 AN: 2110

Alfa AF: 0.870 Hom.: 45455

Bravo AF: 0.912

Asia WGS AF: 0.937 AC: 3256 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.99
CADD	Benign	0.0010
DANN	Benign	0.40
PhyloP100		-3.2
Mutation Taster		=100/0	polymorphism (auto)

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: rs618869; hg19: chr18-53248151;