Genetic Variant UPF3B:c.263+18_263+19insAAAAAAAAAAAAAAAAAAAAAAAAAA (chrX-119851748-C-CTTTTTTTTTTTTTTTTTTTTTTTTTT) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP6_Moderate

The NM_080632.3(UPF3B):c.263+18_263+19insAAAAAAAAAAAAAAAAAAAAAAAAAA variant causes a intron change involving the alteration of a non-conserved nucleotide. It is difficult to determine the true allele frequency of this variant because it is of type INS_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Likely benign (★).

Frequency

Genomes: 𝑓 0.00014 ( 0 hom., 0 hem., cov: 0)

Exomes 𝑓: 0.000077 ( 1 hom. 6 hem. )

Failed GnomAD Quality Control

Consequence

UPF3B
NM_080632.3 intron

Scores

Not classified

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: -0.0650

Publications

0 publications found

Variant links:

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]

UPF3B Gene-Disease associations (from GenCC):

syndromic X-linked intellectual disability 14
Inheritance: XL Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P
X-linked complex neurodevelopmental disorder
Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
non-syndromic X-linked intellectual disability
Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet
X-linked intellectual disability with marfanoid habitus
Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet

UPF3B links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

BP6

Variant X-119851748-C-CTTTTTTTTTTTTTTTTTTTTTTTTTT is Benign according to our data. Variant chrX-119851748-C-CTTTTTTTTTTTTTTTTTTTTTTTTTT is described in ClinVar as [Likely_benign]. Clinvar id is 2966919.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
UPF3B	NM_080632.3 link	c.263+18_263+19insAAAAAAAAAAAAAAAAAAAAAAAAAA		intron_variant	Intron 2 of 10	ENST00000276201.7	NP_542199.1	Q9BZI7-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
UPF3B	ENST00000276201.7 link	c.263+18_263+19insAAAAAAAAAAAAAAAAAAAAAAAAAA		intron_variant	Intron 2 of 10	1	NM_080632.3	ENSP00000276201.3		Q9BZI7-1
UPF3B	ENST00000345865.6 link	c.263+18_263+19insAAAAAAAAAAAAAAAAAAAAAAAAAA		intron_variant	Intron 2 of 9	1		ENSP00000245418.2		Q9BZI7-2

Frequencies

GnomAD3 genomes

AF:

0.000140

AC:

AN:

64224

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000236

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000680

Gnomad ASJ

AF:

0.000500

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000503

Gnomad OTH

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.0000766

AC:

AN:

495885

Hom.:

Cov.:

AF XY:

0.0000411

AC XY:

AN XY:

146079

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00107

AC:

AN:

7489

American (AMR)

AF:

0.000328

AC:

AN:

12188

Ashkenazi Jewish (ASJ)

AF:

0.0000875

AC:

AN:

11429

East Asian (EAS)

AF:

0.0000664

AC:

AN:

15068

South Asian (SAS)

AF:

0.000312

AC:

AN:

28805

European-Finnish (FIN)

AF:

0.0000379

AC:

AN:

26364

Middle Eastern (MID)

AF:

0.00

AC:

AN:

1586

European-Non Finnish (NFE)

AF:

0.0000243

AC:

AN:

370534

Other (OTH)

AF:

0.000223

AC:

AN:

22422

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.370

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000140

AC:

AN:

64216

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

11400

show subpopulations

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.000236

AC:

AN:

12724

American (AMR)

AF:

0.000680

AC:

AN:

4414

Ashkenazi Jewish (ASJ)

AF:

0.000500

AC:

AN:

2002

East Asian (EAS)

AF:

0.00

AC:

AN:

1437

South Asian (SAS)

AF:

0.00

AC:

AN:

965

European-Finnish (FIN)

AF:

0.00

AC:

AN:

1526

Middle Eastern (MID)

AF:

0.00

AC:

AN:

European-Non Finnish (NFE)

AF:

0.0000503

AC:

AN:

39749

Other (OTH)

AF:

0.00

AC:

AN:

788

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.000283), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.381

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Syndromic X-linked intellectual disability 14

Benign:1

Nov 26, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

-0.065

Splicing

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over