rs137852838

Variant names:

• chr12-76348327-A-C
• rs137852838
• NM_024685.4:c.32T>G

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PM1 PM2 PP2 PP3_Strong PP5

The NM_024685.4(BBS10):​c.32T>G​(p.Val11Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,455,164 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: BBS10 NM_024685.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity no assertion criteria provided P:1 U:1
• Conservation: PhyloP100: 0.343
• Publications: 4 publications found

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 Gene-Disease associations (from GenCC):

• Bardet-Biedl syndrome 10

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Myriad Women’s Health, G2P, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• ciliopathy

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• Bardet-Biedl syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000297764 (HGNC:):

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 6 uncertain in NM_024685.4
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 24 curated pathogenic missense variants (we use a threshold of 10). The gene has 5 curated benign missense variants. Trascript score misZ: 0.43507 (below the threshold of 3.09). GenCC associations: The gene is linked to Bardet-Biedl syndrome 10, ciliopathy, Bardet-Biedl syndrome.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.972
• PP5: Variant 12-76348327-A-C is Pathogenic according to our data. Variant chr12-76348327-A-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 1332.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_024685.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BBS10	NM_024685.4	MANE Select	c.32T>G	p.Val11Gly	missense	Exon 1 of 2	NP_078961.3

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BBS10	ENST00000650064.2	MANE Select	c.32T>G	p.Val11Gly	missense	Exon 1 of 2	ENSP00000497413.1
	ENSG00000297764	ENST00000750845.1		n.-150A>C		upstream_gene	N/A

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1455164 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 723380

African (AFR) AF: 0.0000300 AC: 1 AN: 33348

American (AMR) AF: 0.0000228 AC: 1 AN: 43812

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25984

East Asian (EAS) AF: 0.00 AC: 0 AN: 39366

South Asian (SAS) AF: 0.00 AC: 0 AN: 85346

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52636

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5738

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1108826

Other (OTH) AF: 0.00 AC: 0 AN: 60108

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000936 Hom.: 0

Bravo AF: 0.00000378

ClinVar

ClinVar submissions as Germline

Significance: Conflicting classifications of pathogenicity

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	1	-	Bardet-Biedl syndrome 10 (2)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Pathogenic	0.29	D
BayesDel_noAF	Pathogenic	0.18
CADD	Benign	18
DANN	Benign	0.97
DEOGEN2	Uncertain	0.43	T
Eigen	Benign	-0.52
Eigen_PC	Benign	-0.51
FATHMM_MKL	Benign	0.55	D
LIST_S2	Benign	0.39	T
M_CAP	Uncertain	0.20	D
MetaRNN	Pathogenic	0.97	D
MetaSVM	Uncertain	0.23	D
MutationAssessor	Uncertain	2.3	M
PhyloP100		0.34
PrimateAI	Benign	0.37	T
PROVEAN	Uncertain	-3.0	D
REVEL	Uncertain	0.56
Sift	Uncertain	0.0020	D
Sift4G	Uncertain	0.0080	D
Polyphen		0.0020	B
Vest4		0.73
MutPred		0.81		Gain of loop (P = 0.0013)
MVP		0.89
MPC		0.11
ClinPred		0.72	D
GERP RS		3.8
PromoterAI		0.050	Neutral
Varity_R		0.30
gMVP		0.61
Mutation Taster		=28/72	disease causing

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

Other links and lift over

dbSNP: rs137852838; hg19: chr12-76742107;