rs145520487

chr5-37187826-A-G

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4_Strong BP7

The NM_001384732.1(CPLANE1):c.3828T>C(p.Leu1276=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000922 in 1,613,030 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00082 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00093 (3 hom.)
• Consequence: CPLANE1 NM_001384732.1 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:2 B:6
• Conservation: PhyloP100: -0.950

Genes affected

CPLANE1 (HGNC:25801): (ciliogenesis and planar polarity effector complex subunit 1) The protein encoded by this gene has putative coiled-coil domains and may be a transmembrane protein. Defects in this gene are a cause of Joubert syndrome (JBTS). [provided by RefSeq, May 2012]

ACMG classification

Verdict is Likely_benign. Variant got -5 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.67).
• BP7: Synonymous conserved (PhyloP=-0.95 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CPLANE1	NM_001384732.1	c.3828T>C	p.Leu1276=	synonymous_variant	22/53	ENST00000651892.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CPLANE1	ENST00000651892.2	c.3828T>C	p.Leu1276=	synonymous_variant	22/53		NM_001384732.1	A2

Frequencies

GnomAD3 genomes AF: 0.000821 AC: 125 AN: 152222 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000217

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00235

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00110

Gnomad OTH AF: 0.00239

GnomAD3 exomes AF: 0.000655 AC: 164 AN: 250548 Hom.: 1 AF XY: 0.000605 AC XY: 82 AN XY: 135426

Gnomad AFR exome AF: 0.000185

Gnomad AMR exome AF: 0.00207

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.0000462

Gnomad NFE exome AF: 0.000741

Gnomad OTH exome AF: 0.000817

GnomAD4 exome AF: 0.000933 AC: 1363 AN: 1460690 Hom.: 3 Cov.: 30 AF XY: 0.000867 AC XY: 630 AN XY: 726630

Gnomad4 AFR exome AF: 0.000419

Gnomad4 AMR exome AF: 0.00186

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000465

Gnomad4 FIN exome AF: 0.0000187

Gnomad4 NFE exome AF: 0.00109

Gnomad4 OTH exome AF: 0.000812

GnomAD4 genome AF: 0.000821 AC: 125 AN: 152340 Hom.: 0 Cov.: 32 AF XY: 0.000966 AC XY: 72 AN XY: 74500

Gnomad4 AFR AF: 0.000216

Gnomad4 AMR AF: 0.00235

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00110

Gnomad4 OTH AF: 0.00237

Alfa AF: 0.000965 Hom.: 0

Bravo AF: 0.000941

EpiCase AF: 0.000328

EpiControl AF: 0.000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:2 Benign:6

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:1 Benign:3

Benign, criteria provided, single submitter	clinical testing	Invitae	Jan 22, 2024	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Dec 17, 2014	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Sep 30, 2020	This variant is associated with the following publications: (PMID: 26092869) -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Dec 01, 2023	CPLANE1: BP4, BP7 -

Joubert syndrome 17 Pathogenic:1 Uncertain:1

Uncertain significance, 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, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -
Likely pathogenic, flagged submission	research	UW Hindbrain Malformation Research Program, University of Washington	Feb 23, 2015	- -

not specified Benign:2

Likely benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -
Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Dec 08, 2023	Variant summary: CPLANE1 c.3828T>C alters a non-conserved nucleotide resulting in a synonymous change. Consensus agreement among computation tools predict no significant impact on normal splicing. However, these predictions have yet to be confirmed by functional studies. The variant allele was found at a frequency of 0.00092 in 1613030 control chromosomes, predominantly at a frequency of 0.002 within the Latino subpopulation in the gnomAD database, including 1 homozygotes. The observed variant frequency within Latino control individuals in the gnomAD database is approximately 1.35 fold of the estimated maximal expected allele frequency for a pathogenic variant in CPLANE1 causing Joubert Syndrome And Related Disorders phenotype (0.0015), strongly suggesting that the variant is a benign polymorphism found primarily in populations of Latino origin. c.3828T>C has been reported in the literature in individuals affected with Joubert Syndrome And Related Disorders (Bachman_2015). This report does not provide unequivocal conclusions about association of the variant with Joubert Syndrome And Related Disorders. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication have been ascertained in the context of this evaluation (PMID: 26092869). Five submitters have cited clinical-significance assessments for this variant to ClinVar after 2014 and classified as benign/likely benign (n=3), likely pathogenic (n=1) and pathogenic (n=1). Multiple submitters reported the variant with conflicting assessments. Based on the evidence outlined above, the variant was classified as benign. -

Inborn genetic diseases Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 02, 2022

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.67
Cadd	Benign	5.3
Dann	Benign	0.72

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: rs145520487; hg19: chr5-37187928;