Genetic Variant USB1:c.-51G>C (chr16-58001433-G-C) – ACMG Classification: Benign (-14 pts)

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_StrongBP6_ModerateBS1BS2

The NM_024598.4(USB1):c.-51G>C variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000925 in 1,556,442 control chromosomes in the GnomAD database, including 12 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

Frequency

Genomes: 𝑓 0.0048 ( 8 hom., cov: 32)

Exomes 𝑓: 0.00050 ( 4 hom. )

Consequence

USB1
NM_024598.4 5_prime_UTR

Scores

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: -0.0220

Variant links:

Genes affected

USB1 (HGNC:25792): (U6 snRNA biogenesis phosphodiesterase 1) This gene encodes a protein with several conserved domains, however, its exact function is not known. Mutations in this gene are associated with poikiloderma with neutropenia (PN), which shows phenotypic overlap with Rothmund-Thomson syndrome (RTS) caused by mutations in the RECQL4 gene. It is believed that this gene product interacts with RECQL4 protein via SMAD4 proteins, explaining the partial clinical overlap between PN and RTS. Alternatively spliced transcript variants encoding different isoforms have been noted for this gene. [provided by RefSeq, Mar 2011]

USB1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -14 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.75).

BP6

Variant 16-58001433-G-C is Benign according to our data. Variant chr16-58001433-G-C is described in ClinVar as [Likely_benign]. Clinvar id is 1706801.Status of the report is criteria_provided_single_submitter, 1 stars.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0048 (731/152324) while in subpopulation AFR AF= 0.0165 (688/41580). AF 95% confidence interval is 0.0155. There are 8 homozygotes in gnomad4. There are 351 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 8 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
USB1	NM_024598.4 link	c.-51G>C		5_prime_UTR_variant	Exon 1 of 7	ENST00000219281.8	NP_078874.2	Q9BQ65-1A0A024R6V6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
USB1	ENST00000219281 link	c.-51G>C		5_prime_UTR_variant	Exon 1 of 7	1	NM_024598.4	ENSP00000219281.3		Q9BQ65-1

Frequencies

GnomAD3 genomes

AF:

0.00466

AC:

710

AN:

152206

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0161

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00190

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:

0.000118

Gnomad OTH

AF:

0.00287

GnomAD3 exomes

AF:

0.00106

AC:

171

AN:

161838

Hom.:

AF XY:

0.00101

AC XY:

AN XY:

87428

show subpopulations

Gnomad AFR exome

AF:

0.0174

Gnomad AMR exome

AF:

0.000894

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000848

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000628

Gnomad OTH exome

AF:

0.000222

GnomAD4 exome

AF:

0.000504

AC:

708

AN:

1404118

Hom.:

Cov.:

AF XY:

0.000453

AC XY:

314

AN XY:

693820

show subpopulations

Gnomad4 AFR exome

AF:

0.0168

Gnomad4 AMR exome

AF:

0.000952

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000501

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000508

Gnomad4 OTH exome

AF:

0.00127

GnomAD4 genome

AF:

0.00480

AC:

731

AN:

152324

Hom.:

Cov.:

AF XY:

0.00471

AC XY:

351

AN XY:

74480

show subpopulations

Gnomad4 AFR

AF:

0.0165

Gnomad4 AMR

AF:

0.00189

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000118

Gnomad4 OTH

AF:

0.00284

Alfa

AF:

0.000429

Hom.:

Bravo

AF:

0.00538

Asia WGS

AF:

0.00289

AC:

AN:

3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Benign:1

Feb 24, 2021

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

See Variant Classification Assertion Criteria. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.75

CADD

Benign

5.5

DANN

Benign

0.80

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

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