5-37167194-A-G

Variant names:

• chr5-37167194-A-G
• rs775229916
• NM_001384732.1:c.7253T>C

Variant summary

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

The NM_001384732.1(CPLANE1):​c.7253T>C​(p.Ile2418Thr) variant causes a missense change. The variant allele was found at a frequency of 0.00000274 in 1,457,598 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. I2418I) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: CPLANE1 NM_001384732.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.38
• Publications: 0 publications found

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]

CPLANE1 Gene-Disease associations (from GenCC):

• Joubert syndrome 17

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Laboratory for Molecular Medicine, ClinGen, G2P, Illumina, Labcorp Genetics (formerly Invitae)
• orofaciodigital syndrome type 6

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, G2P
• Joubert 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 (MetaRNN=0.37854046).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001384732.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CPLANE1	NM_001384732.1	MANE Select	c.7253T>C	p.Ile2418Thr	missense	Exon 35 of 53	NP_001371661.1
	CPLANE1	NM_023073.4		c.7253T>C	p.Ile2418Thr	missense	Exon 35 of 52	NP_075561.3

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CPLANE1	ENST00000651892.2	MANE Select	c.7253T>C	p.Ile2418Thr	missense	Exon 35 of 53	ENSP00000498265.2
	CPLANE1	ENST00000514429.5	TSL:1	c.4397T>C	p.Ile1466Thr	missense	Exon 20 of 37	ENSP00000424223.1
	CPLANE1	ENST00000509849.5	TSL:1	n.4265T>C		non_coding_transcript_exon	Exon 20 of 37	ENSP00000426337.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1457598 Hom.: 0 Cov.: 31 AF XY: 0.00000276 AC XY: 2 AN XY: 724804

African (AFR) AF: 0.00 AC: 0 AN: 33306

American (AMR) AF: 0.00 AC: 0 AN: 43582

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26038

East Asian (EAS) AF: 0.00 AC: 0 AN: 39592

South Asian (SAS) AF: 0.00 AC: 0 AN: 84614

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53384

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5710

European-Non Finnish (NFE) AF: 0.00000360 AC: 4 AN: 1111118

Other (OTH) AF: 0.00 AC: 0 AN: 60254

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Jul 24, 2019

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0". The threonine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with C5orf42-related disease. This variant is present in population databases (rs775229916, ExAC 0.002%). This sequence change replaces isoleucine with threonine at codon 2418 of the C5orf42 protein (p.Ile2418Thr). The isoleucine residue is highly conserved and there is a moderate physicochemical difference between isoleucine and threonine.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.87
BayesDel_addAF	Uncertain	0.071	D
BayesDel_noAF	Benign	-0.14
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Benign	0.15	T
Eigen	Uncertain	0.56
Eigen_PC	Uncertain	0.53
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.69	T
M_CAP	Benign	0.042	D
MetaRNN	Benign	0.38	T
MetaSVM	Benign	-0.75	T
PhyloP100		4.4
PROVEAN	Uncertain	-2.8	D
REVEL	Benign	0.20
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Vest4		0.57
MVP		0.56
MPC		0.60
ClinPred		0.98	D
GERP RS		5.4
Varity_R		0.53
gMVP		0.41
Mutation Taster		=55/45	polymorphism

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: rs775229916; hg19: chr5-37167296;