rs4318932

Variant names:

• chr7-72578056-C-A
• rs4318932
• NM_001145440.3:c.1786-2337G>T

Variant summary

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

The NM_001145440.3(TYW1B):​c.1786-2337G>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.452 in 151,228 control chromosomes in the GnomAD database, including 17,445 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 0.45 (17445 hom., cov: 30)
• Consequence: TYW1B NM_001145440.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.358
• Publications: 8 publications found

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]

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-1.0).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.698 is higher than 0.05.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001145440.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TYW1B	NM_001145440.3	MANE Select	c.1786-2337G>T		intron	N/A	NP_001138912.2	Q6NUM6-1
	TYW1B	NM_001412179.1		c.1558-2337G>T		intron	N/A	NP_001399108.1
	TYW1B	NM_001412180.1		c.1447-2337G>T		intron	N/A	NP_001399109.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TYW1B	ENST00000620995.5	TSL:1 MANE Select	c.1786-2337G>T		intron	N/A	ENSP00000482502.1	Q6NUM6-1
	TYW1B	ENST00000612372.4	TSL:1	c.1300-19168G>T		intron	N/A	ENSP00000480534.1	A0A087WWV6
	TYW1B	ENST00000902318.1		c.1558-2337G>T		intron	N/A	ENSP00000572377.1

Frequencies

GnomAD3 genomes AF: 0.451 AC: 68219 AN: 151110 Hom.: 17401 Cov.: 30

Gnomad AFR AF: 0.704

Gnomad AMI AF: 0.361

Gnomad AMR AF: 0.436

Gnomad ASJ AF: 0.373

Gnomad EAS AF: 0.558

Gnomad SAS AF: 0.411

Gnomad FIN AF: 0.304

Gnomad MID AF: 0.343

Gnomad NFE AF: 0.326

Gnomad OTH AF: 0.435

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

GnomAD4 genome AF: 0.452 AC: 68314 AN: 151228 Hom.: 17445 Cov.: 30 AF XY: 0.451 AC XY: 33296 AN XY: 73820

African (AFR) AF: 0.704 AC: 28982 AN: 41144

American (AMR) AF: 0.436 AC: 6611 AN: 15174

Ashkenazi Jewish (ASJ) AF: 0.373 AC: 1292 AN: 3464

East Asian (EAS) AF: 0.558 AC: 2841 AN: 5094

South Asian (SAS) AF: 0.411 AC: 1964 AN: 4782

European-Finnish (FIN) AF: 0.304 AC: 3151 AN: 10382

Middle Eastern (MID) AF: 0.341 AC: 99 AN: 290

European-Non Finnish (NFE) AF: 0.326 AC: 22135 AN: 67886

Other (OTH) AF: 0.433 AC: 911 AN: 2104

Alfa AF: 0.386 Hom.: 8012

Bravo AF: 0.473

Asia WGS AF: 0.510 AC: 1774 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-1.0
CADD	Benign	0.57
DANN	Benign	0.63
PhyloP100		-0.36
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: rs4318932; hg19: chr7-72043041;