rs376894444

Positions:

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2PP3_StrongPP5_Very_Strong

The NM_024649.5(BBS1):c.479G>A(p.Arg160Gln) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000929 in 1,613,984 control chromosomes in the GnomAD database, with no homozygous occurrence. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R160W) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 31)

Exomes 𝑓: 0.0000075 ( 0 hom. )

Consequence

BBS1
NM_024649.5 missense, splice_region

Scores

Splicing: ADA: 1.000

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:15

Conservation

PhyloP100: 8.03

Variant links:

Genes affected

BBS1 (HGNC:966): (Bardet-Biedl syndrome 1) Mutations in this gene have been observed in patients with the major form (type 1) of Bardet-Biedl syndrome. The encoded protein may play a role in eye, limb, cardiac and reproductive system development. [provided by RefSeq, Jul 2008]

BBS1 links:

(HGNC:):

links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 14 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

PP5

Variant 11-66515586-G-A is Pathogenic according to our data. Variant chr11-66515586-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 370228.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr11-66515586-G-A is described in Lovd as [Pathogenic]. Variant chr11-66515586-G-A is described in Lovd as [Pathogenic]. Variant chr11-66515586-G-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BBS1	NM_024649.5 linkuse as main transcript	c.479G>A	p.Arg160Gln	missense_variant, splice_region_variant	5/17	ENST00000318312.12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BBS1	ENST00000318312.12 linkuse as main transcript	c.479G>A	p.Arg160Gln	missense_variant, splice_region_variant	5/17	1	NM_024649.5	P1	Q8NFJ9-1
	ENST00000658548.1 linkuse as main transcript	n.623C>T		non_coding_transcript_exon_variant	2/2

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152112

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000966

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000278

AC:

AN:

251440

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135894

show subpopulations

Gnomad AFR exome

AF:

0.000308

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.0000992

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000752

AC:

AN:

1461872

Hom.:

Cov.:

AF XY:

0.00000825

AC XY:

AN XY:

727240

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.0000383

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000360

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152112

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74318

show subpopulations

Gnomad4 AFR

AF:

0.0000966

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:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000108

Hom.:

Bravo

AF:

0.0000453

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000412

AC:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:15

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Bardet-Biedl syndrome 1

Pathogenic:6

Pathogenic, criteria provided, single submitter	clinical testing	3billion	Jan 03, 2022	Same nucleotide change resulting in same amino acid change has been previously reported as pathogenic/likely pathogenic with strong evidence (ClinVar ID: VCV000370228, PMID:26261414, PS1_S). Functional studies provide strong evidence of the variant having a damaging effect on the gene or gene product (PMID: 21520335, PS3_S). It is observed at an extremely low frequency in the gnomAD v2.1.1 dataset (total allele frequency: 0.000028, PM2_M). Therefore, this variant is classified as pathogenic according to the recommendation of ACMG/AMP guideline. -
Likely pathogenic, no assertion criteria provided	clinical testing	Genomics England Pilot Project, Genomics England	-	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Dec 23, 2015	- -
Pathogenic, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Jul 23, 2021	- -
Pathogenic, no assertion criteria provided	clinical testing	Natera, Inc.	Mar 10, 2020	- -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Dec 05, 2023	- -

not provided

Pathogenic:3

Likely pathogenic, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Pathogenic, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Sep 01, 2019	- -

Retinitis pigmentosa

Pathogenic:3

Likely pathogenic, no assertion criteria provided	research	NIHR Bioresource Rare Diseases, University of Cambridge	Jan 01, 2015	- -
Pathogenic, criteria provided, single submitter	clinical testing	Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen	Dec 20, 2022	- -
Pathogenic, no assertion criteria provided	research	Sharon lab, Hadassah-Hebrew University Medical Center	Jun 23, 2019	- -

BBS1-related disorder

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Dec 12, 2023

The BBS1 c.479G>A variant is predicted to result in the amino acid substitution p.Arg160Gln. This variant has been reported in patients with retinitis pigmentosa or milder form of Bardet-Biedl syndrome. This variant is highly prevalent in patients of Arab-Muslim origin (Sharon and Banin. 2015. PubMed ID: 26261414; Hichri et al. 2005. PubMed ID: 15770229; Schmid et al. 2011. PubMed ID: 21520335; Hjortshøj et al. 2010. PubMed ID: 20120035). RT-PCR analysis indicated that this variant results in aberrant splicing. U1snRNA -mediated therapeutic approach to correct the splice defect in patient derived cell lines significantly increased correctly spliced BBS1 transcripts, which would suggest a high potential for gene therapy (Schmid et al. 2011. PubMed ID: 21520335). This variant is reported in 0.031% of alleles in individuals of African descent in gnomAD. This variant is interpreted as likely pathogenic. -

Retinal dystrophy

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Blueprint Genetics

Apr 01, 2019

- -

Bardet-Biedl syndrome

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Oct 13, 2023

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 160 of the BBS1 protein (p.Arg160Gln). This variant also falls at the last nucleotide of exon 5, which is part of the consensus splice site for this exon. This variant is present in population databases (rs376894444, gnomAD 0.03%). This missense change has been observed in individuals with Bardet-Biedl syndrome or nonsyndromic retinitis pigmentosa (PMID: 15770229, 21520335, 26261414). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 370228). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Studies have shown that this missense change is associated with altered splicing resulting in out of frame partial intron 5 inclusion and/or in-frame exon 6 skipping (PMID: 21520335). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Uncertain

0.11

BayesDel_noAF

Pathogenic

0.22

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.80

.;D;.;.

Eigen

Pathogenic

0.72

Eigen_PC

Pathogenic

0.71

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.93

D;D;D;D

M_CAP

Uncertain

0.28

MetaRNN

Uncertain

0.44

T;T;T;T

MetaSVM

Uncertain

0.73

MutationAssessor

Uncertain

2.5

.;M;.;M

MutationTaster

Benign

1.0

D;D;D;D

PrimateAI

Benign

0.45

PROVEAN

Benign

-2.2

N;N;N;N

REVEL

Uncertain

0.60

Sift

Benign

0.13

T;T;T;D

Sift4G

Benign

0.10

T;T;D;T

Polyphen

1.0

.;D;.;.

Vest4

0.58

MVP

0.98

MPC

0.69

ClinPred

0.44

GERP RS

5.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

2.7

Varity_R

0.33

gMVP

0.57

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

1.0

SpliceAI score (max)

0.62

Details are displayed if max score is > 0.2

DS_DL_spliceai

0.62

Position offset: 0

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