chr12-76344762-G-A

Position:

• chr12-76344762-G-A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The NM_024685.4(BBS10):​c.*1051C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.785 in 152,094 control chromosomes in the GnomAD database, including 47,025 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.78 (47025 hom., cov: 32)
  • Failed GnomAD Quality Control
• Consequence: BBS10 NM_024685.4 3_prime_UTR
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: -0.0110

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 Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.79).
• BP6: Variant 12-76344762-G-A is Benign according to our data. Variant chr12-76344762-G-A is described in ClinVar as [Benign]. Clinvar id is 310474.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.902 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BBS10	NM_024685.4	c.*1051C>T		3_prime_UTR_variant	2/2	ENST00000650064.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BBS10	ENST00000650064.2	c.*1051C>T		3_prime_UTR_variant	2/2		NM_024685.4	P1

Frequencies

GnomAD3 genomes AF: 0.785 AC: 119233 AN: 151976 Hom.: 46989 Cov.: 32

Gnomad AFR AF: 0.808

Gnomad AMI AF: 0.786

Gnomad AMR AF: 0.854

Gnomad ASJ AF: 0.829

Gnomad EAS AF: 0.924

Gnomad SAS AF: 0.864

Gnomad FIN AF: 0.793

Gnomad MID AF: 0.880

Gnomad NFE AF: 0.734

Gnomad OTH AF: 0.808

GnomAD4 exome Data not reliable, filtered out with message: AC0 AC: 0 AN: 0 Hom.: 0 Cov.: 0 AC XY: 0 AN XY: 0

GnomAD4 genome AF: 0.785 AC: 119330 AN: 152094 Hom.: 47025 Cov.: 32 AF XY: 0.791 AC XY: 58803 AN XY: 74342

Gnomad4 AFR AF: 0.808

Gnomad4 AMR AF: 0.854

Gnomad4 ASJ AF: 0.829

Gnomad4 EAS AF: 0.924

Gnomad4 SAS AF: 0.864

Gnomad4 FIN AF: 0.793

Gnomad4 NFE AF: 0.734

Gnomad4 OTH AF: 0.809

Alfa AF: 0.751 Hom.: 40175

Bravo AF: 0.790

Asia WGS AF: 0.875 AC: 3006 AN: 3436

ClinVar

Significance: Benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:1

Benign, criteria provided, single submitter

not provided

Breakthrough Genomics, Breakthrough Genomics

-

- -

Bardet-Biedl syndrome 10 Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.79
CADD	Benign	0.46
DANN	Benign	0.67

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: rs3087711; hg19: chr12-76738542;