chr12-76348214-G-C

Position:

• chr12-76348214-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PM5 PP3

The NM_024685.4(BBS10):​c.145C>G​(p.Arg49Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R49W) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: BBS10 NM_024685.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.15

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr12-76348214-G-A is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.762

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BBS10	NM_024685.4	c.145C>G	p.Arg49Gly	missense_variant	1/2	ENST00000650064.2	NP_078961.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BBS10	ENST00000650064.2	c.145C>G	p.Arg49Gly	missense_variant	1/2		NM_024685.4	ENSP00000497413	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.44
BayesDel_addAF	Pathogenic	0.28	D
BayesDel_noAF	Pathogenic	0.16
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.50	T;T
Eigen	Uncertain	0.38
Eigen_PC	Uncertain	0.38
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.79	.;T
M_CAP	Uncertain	0.18	D
MetaRNN	Pathogenic	0.76	D;D
MetaSVM	Uncertain	-0.15	T
MutationAssessor	Benign	1.4	L;L
MutationTaster	Benign	1.0	D
PrimateAI	Benign	0.43	T
PROVEAN	Benign	-1.9	N;.
REVEL	Pathogenic	0.65
Sift	Uncertain	0.0050	D;.
Sift4G	Pathogenic	0.0	D;.
Polyphen		0.92	P;P
Vest4		0.77
MutPred		0.59		Gain of catalytic residue at G52 (P = 0.0014);Gain of catalytic residue at G52 (P = 0.0014);
MVP		0.83
MPC		0.41
ClinPred		0.94	D
GERP RS		4.3
Varity_R		0.76
gMVP		0.59

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs768933093; hg19: chr12-76741994;