rs137852857

Positions:

• chr7-33177570-G-A

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM2 PP3_Strong PP5_Moderate

The NM_198428.3(BBS9):​c.421G>A​(p.Gly141Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: BBS9 NM_198428.3 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 9.48

Genes affected

BBS9 (HGNC:30000): (Bardet-Biedl syndrome 9) This gene is downregulated by parathyroid hormone in osteoblastic cells, and therefore is thought to be involved in parathyroid hormone action in bones. The exact function of this gene has not yet been determined. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Jan 2017]

BBS9 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.975
• PP5: Variant 7-33177570-G-A is Pathogenic according to our data. Variant chr7-33177570-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 2659.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BBS9	NM_198428.3	c.421G>A	p.Gly141Arg	missense_variant	5/23	ENST00000242067.11	NP_940820.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BBS9	ENST00000242067.11	c.421G>A	p.Gly141Arg	missense_variant	5/23	1	NM_198428.3	ENSP00000242067.6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Bardet-Biedl syndrome 9 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Dec 01, 2005

- -

Bardet-Biedl syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

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

Oct 17, 2024

Variant summary: BBS9 c.421G>A (p.Gly141Arg) results in a non-conservative amino acid change located in the PTHB1, N-terminal domain (IPR028073) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant was absent in 251308 control chromosomes. c.421G>A has been reported in the literature in homozygous individuals affected with Bardet-Biedl Syndrome (Nishimura_2005). These data indicate that the variant is likely to be associated with disease. At least one publication reports experimental evidence evaluating an impact on protein function. Using zebrafish as a model, p.Gly141Arg was unable to rescue the bbs9 morphant phenotype (Veleri_2012). The following publications have been ascertained in the context of this evaluation (PMID: 26085087, 16380913, 22479622, 20498079). ClinVar contains an entry for this variant (Variation ID: 2659). Based on the evidence outlined above, the variant was classified as likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.47	D
BayesDel_noAF	Pathogenic	0.44
CADD	Pathogenic	31
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.63	D;.;.;.;.;T
Eigen	Pathogenic	0.91
Eigen_PC	Pathogenic	0.86
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D;D;D;D;D;D
M_CAP	Uncertain	0.23	D
MetaRNN	Pathogenic	0.98	D;D;D;D;D;D
MetaSVM	Pathogenic	0.83	D
MutationAssessor	Pathogenic	3.0	M;M;M;M;.;.
PrimateAI	Uncertain	0.74	T
PROVEAN	Pathogenic	-7.6	D;D;D;D;D;D
REVEL	Pathogenic	0.90
Sift	Pathogenic	0.0	D;D;D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D;D;D
Polyphen		1.0	D;D;D;.;.;.
Vest4		0.99
MutPred		0.84		Gain of solvent accessibility (P = 0.0063);Gain of solvent accessibility (P = 0.0063);Gain of solvent accessibility (P = 0.0063);Gain of solvent accessibility (P = 0.0063);.;.;
MVP		0.97
MPC		0.43
ClinPred		1.0	D
GERP RS		5.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.96
gMVP		0.84

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

Other links and lift over

dbSNP: rs137852857; hg19: chr7-33217182;