rs727503818

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PVS1_StrongPM2PP5_Very_Strong

The NM_024685.4(BBS10):c.1091delA(p.Asn364ThrfsTer5) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000397 in 1,613,214 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000039 ( 0 hom. )

Consequence

BBS10
NM_024685.4 frameshift

Scores

Not classified

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:13

Conservation

PhyloP100: 1.40

Variant links:

Genes affected

BBS10 (HGNC:26291): (Bardet-Biedl syndrome 10) This gene is a member of the Bardet-Biedl syndrome (BBS) gene family. Bardet-Biedl syndrome is an autosomal recessive disorder characterized by progressive retinal degeneration, obesity, polydactyly, renal malformation and cognitive disability. The proteins encoded by BBS gene family members are structurally diverse and the similar phenotypes exhibited by mutations in BBS gene family members is likely due to their shared roles in cilia formation and function. Many BBS proteins localize to the basal bodies, ciliary axonemes, and pericentriolar regions of cells. BBS proteins may also be involved in intracellular trafficking via microtubule-related transport. The protein encoded by this gene is likely not a ciliary protein but rather has distant sequence homology to type II chaperonins. As a molecular chaperone, this protein may affect the folding or stability of other ciliary or basal body proteins. Inhibition of this protein's expression impairs ciliogenesis in preadipocytes. Mutations in this gene cause Bardet-Biedl syndrome type 10. [provided by RefSeq, Jan 2010]

BBS10 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 14 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 17 pathogenic variants in the truncated region.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 12-76346893-GT-G is Pathogenic according to our data. Variant chr12-76346893-GT-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 166723.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr12-76346893-GT-G is described in Lovd as [Likely_pathogenic]. Variant chr12-76346893-GT-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BBS10	NM_024685.4 link	c.1091delA	p.Asn364ThrfsTer5	frameshift_variant	Exon 2 of 2	ENST00000650064.2	NP_078961.3	Q8TAM1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BBS10	ENST00000650064.2 link	c.1091delA	p.Asn364ThrfsTer5	frameshift_variant	Exon 2 of 2		NM_024685.4	ENSP00000497413.1		Q8TAM1

Frequencies

GnomAD3 genomes

AF:

0.0000460

AC:

AN:

152168

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00202

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:

0.0000678

AC:

AN:

250590

Hom.:

AF XY:

0.0000664

AC XY:

AN XY:

135524

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00149

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000176

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000390

AC:

AN:

1461046

Hom.:

Cov.:

AF XY:

0.0000413

AC XY:

AN XY:

726868

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00165

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000899

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152168

Hom.:

Cov.:

AF XY:

0.0000807

AC XY:

AN XY:

74354

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00202

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:

0.000174

Hom.:

Bravo

AF:

0.0000491

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000119

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:13

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Bardet-Biedl syndrome 10

Pathogenic:7

Mar 20, 2024

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jun 07, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Aug 15, 2018

Illumina Laboratory Services, Illumina

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The BBS10 c.1091delA (p.Asn364ThrfsTer5) variant results in a frameshift, and is predicted to result in premature termination of the protein. Across four studies, the p.Asn364ThrfsTer5 variant has been identified in a total of four individuals with Bardet-Biedl syndrome (BBS) including in two in a homozygous state and in two in a compound heterozygous state with a second null variant (White et al. 2007; Muller et al. 2010; Chen et al. 2011; Pierrottet et al. 2014). One homozygous individual was also heterozygous for a missense variant in the BBS6 gene (Chen et al. 2011). Control data are unavailable for this variant, which is reported at a frequency of 0.001676 in the Ashkenazi Jewish population of the Genome Aggregation Database. Based on the evidence, the p.Asn364ThrfsTer5 variant is classified as pathogenic for Bardet-Biedl syndrome. This variant was observed by ICSL as part of a predisposition screen in an ostensibly healthy population. -

Sep 16, 2020

Natera, Inc.

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Apr 09, 2014

Counsyl

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: literature only

- -

Aug 04, 2014

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The Asn364ThrfsX5 variant in BBS10 has been reported in 1 individual with Bardet Biedl syndrome in whom it was found to be in compound heterozygosity with another frameshift variant (Muller 2010). This variant was also not identified in large population studies. This frameshift variant is predicted to alter the protein’s amino acid sequence beginning at position 364 and lead to a premature termination codon 5 amino acids downstream. This alteration is then predicted to lead to a truncated or absent protein. In summary, this variant meets our criteria to be classified as pathogenic (http://pcpgm.partners.org/LMM). -

May 21, 2020

Victorian Clinical Genetics Services, Murdoch Childrens Research Institute

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

A heterozygous deletion variant was identified, NM_024685.4(BBS10):c.1091del in exon 2 of 2 of the BBS10 gene. This deletion is predicted to cause a frameshift from amino acid position 364 introducing a stop codon downstream; NP_078961.3(BBS10):p.(Asn364Thrfs*5), resulting in loss of normal protein function through truncation (half of the protein). The variant is present in the gnomAD population database at a global population frequency of 0.007% (19 heterozygotes, 0 homozygotes) with an Ashkenazi-Jewish sub-population frequency of 0.2%. It has been previously reported in patients with Bardet-Biedl syndrome (ClinVar; Manara, E. et al. (2019)). Other variants predicted to cause a truncated protein have been reported as pathogenic in individuals with Bardet-Biedl syndrome (ClinVar). Based on information available at the time of curation, this variant has been classified as PATHOGENIC. -

Bardet-Biedl syndrome

Pathogenic:4

Sep 15, 2018

Laboratory of Medical Genetics (UMR_S 1112), INSERM/Strasbourg University

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: provider interpretation

- -

Mar 02, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Asn364Thrfs*5) in the BBS10 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 360 amino acid(s) of the BBS10 protein. This variant is present in population databases (rs727503818, gnomAD 0.2%). This premature translational stop signal has been observed in individual(s) with Bardet-Biedl syndrome (PMID: 20177705). ClinVar contains an entry for this variant (Variation ID: 166723). This variant disrupts a region of the BBS10 protein in which other variant(s) (p.Val707*) have been determined to be pathogenic (PMID: 20472660, 22773737, 25982971, 27486776). 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. -

Jun 09, 2016

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: The BBS10 c.1091delA (p.Asn364Thrfs) variant results in a premature termination codon, predicted to cause a truncated or absent BBS10 protein due to nonsense mediated decay, which are commonly known mechanisms for disease. One in silico tool predicts a damaging outcome for this variant. This variant was found in 6/121092 control chromosomes at a frequency of 0.0000495, which does not exceed the estimated maximal expected allele frequency of a pathogenic BBS10 variant (0.0013363). It was reported in several BBS patients in either homozygosity or compound heterozygosity with a disease causing variant indicating pathogenicity. Furthermore, truncations downstream of this position have been classified as pathogenic by our laboratory (e.g. c.1428delC, c.1677delC). Moreover, multiple clinical diagnostic laboratories/reputable databases classified this variant as pathogenic. Taken together, this variant is classified as pathogenic. -

Jun 23, 2019

Sharon lab, Hadassah-Hebrew University Medical Center

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: research

- -

Bardet-Biedl syndrome 1

Pathogenic:1

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Pathogenic:1

May 02, 2014

Eurofins Ntd Llc (ga)

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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