NM_001271893.4:c.168delC

Variant names:

• chr2-238848379-GC-G
• rs1574742341
• NM_001271893.4:c.168delC

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PVS1 PM2 PP5

The NM_001271893.4(TWIST2):​c.168delC​(p.Ser57AlafsTer45) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TWIST2 NM_001271893.4 frameshift
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 1.36

Genes affected

TWIST2 (HGNC:20670): (twist family bHLH transcription factor 2) The protein encoded by this gene is a basic helix-loop-helix type transcription factor and shares similarity with Twist. This protein may inhibit osteoblast maturation and maintain cells in a preosteoblast phenotype during osteoblast development. This gene may be upregulated in certain cancers. Mutations in this gene cause focal facial dermal dysplasia 3, Setleis type. Two transcript variants encoding the same protein have been found. [provided by RefSeq, Apr 2014]

ACMG classification

Verdict is Pathogenic. Variant got 11 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 2-238848379-GC-G is Pathogenic according to our data. Variant chr2-238848379-GC-G is described in ClinVar as [Pathogenic]. Clinvar id is 39840.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TWIST2	NM_001271893.4	c.168delC	p.Ser57AlafsTer45	frameshift_variant	Exon 1 of 2	ENST00000612363.2	NP_001258822.1
TWIST2	NM_057179.3	c.168delC	p.Ser57AlafsTer45	frameshift_variant	Exon 1 of 2		NP_476527.1
TWIST2	XR_007069137.1	n.299delC		non_coding_transcript_exon_variant	Exon 1 of 2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TWIST2	ENST00000612363.2	c.168delC	p.Ser57AlafsTer45	frameshift_variant	Exon 1 of 2	1	NM_001271893.4	ENSP00000482581.1
TWIST2	ENST00000448943.2	c.168delC	p.Ser57AlafsTer45	frameshift_variant	Exon 1 of 2	1		ENSP00000405176.2
TWIST2	ENST00000710607.1	c.168delC	p.Ser57AlafsTer45	frameshift_variant	Exon 1 of 2			ENSP00000518373.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Focal facial dermal dysplasia type III Pathogenic:1

Oct 01, 2011

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

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Computational scores

Source: dbNSFP v4.3

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: rs1574742341; hg19: chr2-239757020;