Genetic Variant TYW1B:p.Glu269Lys (chr7-72802441-C-T) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_001145440.3(TYW1B):c.805G>A(p.Glu269Lys) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,461,642 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

TYW1B
NM_001145440.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 6.05

Variant links:

Genes affected

TYW1B (HGNC:33908): (tRNA-yW synthesizing protein 1 homolog B) Wybutosine is a hypermodified guanosine found in phenylalanine tRNA. Wybutosine functions to stabilize codon-anticodon interactions during ribosome decoding and therefore supports the maintenance of the reading frame. In yeast, the homolog of this gene is essential for the synthesis of wybutosine. The human genome contains two closely related genes that putatively function in wybutosine synthesis. The open reading frame of this locus is disrupted in some individuals. Thus, this locus appears to be an evolving pseudogene, but may still be functional in some members of the population. [provided by RefSeq, Apr 2014]

TYW1B links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.20120496).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TYW1B	NM_001145440.3 link	c.805G>A	p.Glu269Lys	missense_variant	Exon 6 of 14	ENST00000620995.5	NP_001138912.2	Q6NUM6-1
TYW1B	NM_001412179.1 link	c.805G>A	p.Glu269Lys	missense_variant	Exon 6 of 12		NP_001399108.1
TYW1B	NM_001412180.1 link	c.805G>A	p.Glu269Lys	missense_variant	Exon 6 of 11		NP_001399109.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
TYW1B	ENST00000620995.5 link	c.805G>A	p.Glu269Lys	missense_variant	Exon 6 of 14	1	NM_001145440.3	ENSP00000482502.1	Q6NUM6-1
TYW1B	ENST00000612372.4 link	c.319G>A	p.Glu107Lys	missense_variant	Exon 4 of 12	1		ENSP00000480534.1	A0A087WWV6
TYW1B	ENST00000610600.1 link	c.610G>A	p.Glu204Lys	missense_variant	Exon 5 of 8	2		ENSP00000484480.1	A0A087X1V1

Frequencies

GnomAD3 genomes

AF:

0.00

AC:

AN:

152098

Hom.:

Cov.:

FAILED QC

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000159

AC:

AN:

251136

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135732

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000217

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1461642

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

727132

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.00000657

AC:

AN:

152098

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74302

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000151

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

May 12, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.805G>A (p.E269K) alteration is located in exon 6 (coding exon 6) of the TYW1B gene. This alteration results from a G to A substitution at nucleotide position 805, causing the glutamic acid (E) at amino acid position 269 to be replaced by a lysine (K). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.16

BayesDel_addAF

Benign

-0.14

BayesDel_noAF

Benign

-0.14

CADD

Pathogenic

DANN

Benign

0.72

DEOGEN2

Uncertain

0.47

.;T;.

FATHMM_MKL

Benign

0.68

LIST_S2

Pathogenic

0.98

D;D;D

M_CAP

Benign

0.0056

MetaRNN

Benign

0.20

T;T;T

PrimateAI

Uncertain

0.69

Sift4G

Uncertain

0.048

D;D;D

Polyphen

1.0

.;D;.

Vest4

0.53

MVP

0.24

GERP RS

2.8

Varity_R

0.13

gMVP

0.62

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.040

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

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