NM_001378418.1:c.2224C>T

Variant names:

• chr22-42213082-G-A
• rs1555926209
• NM_001378418.1:c.2224C>T

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_001378418.1(TCF20):​c.2224C>T​(p.Arg742*) variant causes a stop gained change involving the alteration of a non-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 Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TCF20 NM_001378418.1 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: 1.95

Genes affected

TCF20 (HGNC:11631): (transcription factor 20) This gene encodes a transcription factor that recognizes the platelet-derived growth factor-responsive element in the matrix metalloproteinase 3 promoter. The encoded protein is thought to be a transcriptional coactivator, enhancing the activity of transcription factors such as JUN and SP1. Mutations in this gene are associated with autism spectrum disorders. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2015]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 22-42213082-G-A is Pathogenic according to our data. Variant chr22-42213082-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 521787.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr22-42213082-G-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TCF20	NM_001378418.1	c.2224C>T	p.Arg742*	stop_gained	Exon 2 of 6	ENST00000677622.1	NP_001365347.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TCF20	ENST00000677622.1	c.2224C>T	p.Arg742*	stop_gained	Exon 2 of 6		NM_001378418.1	ENSP00000503828.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Neurodevelopmental abnormality Pathogenic:1

Nov 14, 2018

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Neurodevelopmental delay Pathogenic:1

-

Centre de Biologie Pathologie Génétique, Centre Hospitalier Universitaire de Lille

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Inborn genetic diseases Pathogenic:1

May 10, 2017

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Developmental delay with variable intellectual impairment and behavioral abnormalities Pathogenic:1

May 20, 2019

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

not provided Pathogenic:1

Nov 14, 2018

GeneDx

Significance: Pathogenic

Review Status: flagged submission

Collection Method: clinical testing

The R742X variant in the TCF20 gene has been observed in internal GeneDx whole exome sequencing data in association with intellectual disability, global developmental delay, autism spectrum disorder, neurologic abnormalities, and dysmorphic features. This variant is predicted to cause loss of normal protein function either through protein truncation or nonsense-mediated mRNA decay. The R742X variant is not observed in large population cohorts (Lek et al., 2016). Therefore, we interpret R742X as a pathogenic variant. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.63
CADD	Pathogenic	38
DANN	Uncertain	1.0
Eigen	Pathogenic	0.85
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Uncertain	0.96	D
Vest4		0.39
GERP RS		5.8

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: rs1555926209; hg19: chr22-42609088;