X-119837615-CAAAAAAAAAAA-CAAAAAAAA

Variant names:

• chrX-119837615-CAAA-C
• rs34350340
• NM_080632.3:c.1302+139_1302+141delTTT

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BS1

The NM_080632.3(UPF3B):​c.1302+139_1302+141delTTT variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0105 in 385,375 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.000045 (0 hom., 0 hem., cov: 16)
  • Exomes 𝑓: 0.012 (0 hom. 0 hem.)
• Consequence: UPF3B NM_080632.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.74

Genes affected

UPF3B (HGNC:20439): (UPF3B regulator of nonsense mediated mRNA decay) This gene encodes a protein that is part of a post-splicing multiprotein complex involved in both mRNA nuclear export and mRNA surveillance. The encoded protein is one of two functional homologs to yeast Upf3p. mRNA surveillance detects exported mRNAs with truncated open reading frames and initiates nonsense-mediated mRNA decay (NMD). When translation ends upstream from the last exon-exon junction, this triggers NMD to degrade mRNAs containing premature stop codons. This protein binds to the mRNA and remains bound after nuclear export, acting as a nucleocytoplasmic shuttling protein. It forms with Y14 a complex that binds specifically 20 nt upstream of exon-exon junctions. This gene is located on the long arm of chromosome X. Two splice variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_benign. Variant got -4 ACMG points.

• BS1: Variant frequency is greater than expected in population mid. gnomad4_exome allele frequency = 0.0118 (4030/341060) while in subpopulation MID AF= 0.0176 (20/1139). AF 95% confidence interval is 0.0136. There are 0 homozygotes in gnomad4_exome. There are 0 alleles in male gnomad4_exome subpopulation. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
UPF3B	NM_080632.3	c.1302+139_1302+141delTTT		intron_variant	Intron 10 of 10	ENST00000276201.7	NP_542199.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
UPF3B	ENST00000276201.7	c.1302+139_1302+141delTTT		intron_variant	Intron 10 of 10	1	NM_080632.3	ENSP00000276201.3
UPF3B	ENST00000345865.6	c.1263+139_1263+141delTTT		intron_variant	Intron 9 of 9	1		ENSP00000245418.2

Frequencies

GnomAD3 genomes AF: 0.0000451 AC: 2 AN: 44315 Hom.: 0 Cov.: 16 AF XY: 0.00 AC XY: 0 AN XY: 7393

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000942

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.0118 AC: 4030 AN: 341060 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 100614

Gnomad4 AFR exome AF: 0.0131

Gnomad4 AMR exome AF: 0.0154

Gnomad4 ASJ exome AF: 0.0114

Gnomad4 EAS exome AF: 0.0148

Gnomad4 SAS exome AF: 0.00709

Gnomad4 FIN exome AF: 0.0140

Gnomad4 NFE exome AF: 0.0116

Gnomad4 OTH exome AF: 0.0130

GnomAD4 genome AF: 0.0000451 AC: 2 AN: 44315 Hom.: 0 Cov.: 16 AF XY: 0.00 AC XY: 0 AN XY: 7393

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000942

Gnomad4 OTH AF: 0.00

ClinVar

Not reported in ClinVar

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: rs34350340; hg19: chrX-118971578;