Variant 7-19117045-TGCCGCCGCCGCCGCCCGCGCCGCC-TGCCGCCGCCGCCGCCCGCGCCGCCGCCGCCGCCCGCGCCGCC details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM1BS2

The NM_000474.4(TWIST1):c.259_276dupGCGGGCGGCGGCGGCGGC(p.Gly92_Ser93insAlaGlyGlyGlyGlyGly) variant causes a conservative inframe insertion change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000119 in 150,740 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00012 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000087 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

TWIST1
NM_000474.4 conservative_inframe_insertion

Scores

Not classified

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.251

Variant links:

Genes affected

TWIST1 (HGNC:12428): (twist family bHLH transcription factor 1) This gene encodes a basic helix-loop-helix (bHLH) transcription factor that plays an important role in embryonic development. The encoded protein forms both homodimers and heterodimers that bind to DNA E box sequences and regulate the transcription of genes involved in cranial suture closure during skull development. This protein may also regulate neural tube closure, limb development and brown fat metabolism. This gene is hypermethylated and overexpressed in multiple human cancers, and the encoded protein promotes tumor cell invasion and metastasis, as well as metastatic recurrence. Mutations in this gene cause Saethre-Chotzen syndrome in human patients, which is characterized by craniosynostosis, ptosis and hypertelorism. [provided by RefSeq, Jul 2020]

TWIST1 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM1

In a chain Twist-related protein 1 (size 201) in uniprot entity TWST1_HUMAN there are 17 pathogenic changes around while only 3 benign (85%) in NM_000474.4

BS2

High AC in GnomAd4 at 18 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TWIST1	NM_000474.4 link	c.259_276dupGCGGGCGGCGGCGGCGGC	p.Gly92_Ser93insAlaGlyGlyGlyGlyGly	conservative_inframe_insertion	1/2	ENST00000242261.6	NP_000465.1	Q15672
TWIST1	NR_149001.2 link	n.574_591dupGCGGGCGGCGGCGGCGGC		non_coding_transcript_exon_variant	1/3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TWIST1	ENST00000242261.6 link	c.259_276dupGCGGGCGGCGGCGGCGGC	p.Gly92_Ser93insAlaGlyGlyGlyGlyGly	conservative_inframe_insertion	1/2	1	NM_000474.4	ENSP00000242261.5		Q15672
TWIST1	ENST00000354571.5 link	n.55_72dupGCGGGCGGCGGCGGCGGC		non_coding_transcript_exon_variant	1/3	2		ENSP00000346582.5		H7BY00

Frequencies

GnomAD3 genomes

AF:

0.000119

AC:

AN:

150740

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000132

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000586

Gnomad SAS

AF:

0.000622

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000148

Gnomad OTH

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.0000866

AC:

112

AN:

1292786

Hom.:

Cov.:

AF XY:

0.0000832

AC XY:

AN XY:

636938

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000663

Gnomad4 SAS exome

AF:

0.0000319

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000101

Gnomad4 OTH exome

AF:

0.0000561

GnomAD4 genome

AF:

0.000119

AC:

AN:

150740

Hom.:

Cov.:

AF XY:

0.000163

AC XY:

AN XY:

73528

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000132

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000586

Gnomad4 SAS

AF:

0.000622

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000148

Gnomad4 OTH

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Saethre-Chotzen syndrome;C4551902:TWIST1-related craniosynostosis

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 07, 2024

This variant, c.259_276dup, results in the insertion of 6 amino acid(s) of the TWIST1 protein (p.Ala87_Gly92dup), but otherwise preserves the integrity of the reading frame. This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with TWIST1-related conditions. ClinVar contains an entry for this variant (Variation ID: 1971612). Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over