rs1173504533

Positions:

chr4-122742159-GT-G

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_152618.3(BBS12):c.270del(p.Val92LeufsTer20) variant causes a frameshift change. The variant allele was found at a frequency of 0.00000342 in 1,461,674 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. F90F) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000034 ( 0 hom. )

Consequence

BBS12
NM_152618.3 frameshift

Scores

Not classified

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3

Conservation

PhyloP100: 5.34

Variant links:

Genes affected

BBS12 (HGNC:26648): (Bardet-Biedl syndrome 12) The protein encoded by this gene is part of a complex that is involved in membrane trafficking. The encoded protein is a molecular chaperone that aids in protein folding upon ATP hydrolysis. This protein also plays a role in adipocyte differentiation. Defects in this gene are a cause of Bardet-Biedl syndrome type 12. Two transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, May 2010]

BBS12 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 18 ACMG points.

PVS1

Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 99 pathogenic variants in the truncated region.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 4-122742159-GT-G is Pathogenic according to our data. Variant chr4-122742159-GT-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 555873.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
BBS12	NM_152618.3 linkuse as main transcript	c.270del	p.Val92LeufsTer20	frameshift_variant	2/2	ENST00000314218.8
BBS12	NM_001178007.2 linkuse as main transcript	c.270del	p.Val92LeufsTer20	frameshift_variant	3/3
BBS12	XM_011531680.3 linkuse as main transcript	c.270del	p.Val92LeufsTer20	frameshift_variant	2/2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris
BBS12	ENST00000314218.8 linkuse as main transcript	c.270del	p.Val92LeufsTer20	frameshift_variant	2/2	1	NM_152618.3	P1
BBS12	ENST00000542236.5 linkuse as main transcript	c.270del	p.Val92LeufsTer20	frameshift_variant	3/3	2		P1
BBS12	ENST00000433287.1 linkuse as main transcript	c.270del	p.Val92LeufsTer20	frameshift_variant	3/3	2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000400

AC:

AN:

250296

Hom.:

AF XY:

0.00000738

AC XY:

AN XY:

135492

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000885

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000342

AC:

AN:

1461674

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

727112

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000450

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000434

Hom.:

Bravo

AF:

0.00000378

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Bardet-Biedl syndrome 12

Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Mar 12, 2024	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Jan 02, 2018	- -

Bardet-Biedl syndrome

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Sep 03, 2023

ClinVar contains an entry for this variant (Variation ID: 555873). This variant is also known as 268delT. This premature translational stop signal has been observed in individual(s) with Bardet-Biedl syndrome (PMID: 17160889). This variant is present in population databases (no rsID available, gnomAD 0.002%). This sequence change creates a premature translational stop signal (p.Val92Leufs*20) in the BBS12 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 619 amino acid(s) of the BBS12 protein. This variant disrupts a region of the BBS12 protein in which other variant(s) (p.Asp687Valfs*3) have been determined to be pathogenic (Invitae). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

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