4-122743915-C-A

Variant names:

• chr4-122743915-C-A
• rs752202089
• NM_152618.3:c.2023C>A

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_152618.3(BBS12):​c.2023C>A​(p.Arg675Arg) variant causes a synonymous change. The variant allele was found at a frequency of 0.000000687 in 1,454,710 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: BBS12 NM_152618.3 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.94
• Publications: 0 publications found

Genes affected

BBS12 (HGNC:26648): (Bardet-Biedl syndrome 12) The protein encoded by this gene is part of a complex that is involved in membrane trafficking. The encoded protein is a molecular chaperone that aids in protein folding upon ATP hydrolysis. This protein also plays a role in adipocyte differentiation. Defects in this gene are a cause of Bardet-Biedl syndrome type 12. Two transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, May 2010]

BBS12 Gene-Disease associations (from GenCC):

• Bardet-Biedl syndrome 12

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Myriad Women’s Health, G2P, Ambry Genetics
• BBS12-related ciliopathy

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

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.17).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_152618.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BBS12	NM_152618.3	MANE Select	c.2023C>A	p.Arg675Arg	synonymous	Exon 2 of 2	NP_689831.2
	BBS12	NM_001178007.2		c.2023C>A	p.Arg675Arg	synonymous	Exon 3 of 3	NP_001171478.1	Q6ZW61

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BBS12	ENST00000314218.8	TSL:1 MANE Select	c.2023C>A	p.Arg675Arg	synonymous	Exon 2 of 2	ENSP00000319062.3	Q6ZW61
	BBS12	ENST00000542236.5	TSL:2	c.2023C>A	p.Arg675Arg	synonymous	Exon 3 of 3	ENSP00000438273.1	Q6ZW61

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.87e-7 AC: 1 AN: 1454710 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 722966

African (AFR) AF: 0.00 AC: 0 AN: 33062

American (AMR) AF: 0.00 AC: 0 AN: 43698

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25780

East Asian (EAS) AF: 0.00 AC: 0 AN: 39650

South Asian (SAS) AF: 0.00 AC: 0 AN: 85006

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53230

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5724

European-Non Finnish (NFE) AF: 9.02e-7 AC: 1 AN: 1108522

Other (OTH) AF: 0.00 AC: 0 AN: 60038

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.17
CADD	Benign	8.4
DANN	Benign	0.71
PhyloP100		4.9

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: rs752202089; hg19: chr4-123665070;