chr17-80036673-C-T

Position:

chr17-80036673-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_017950.4(CCDC40):c.11C>T(p.Pro4Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000336 in 1,459,926 control chromosomes in the GnomAD database, including 1 homozygotes. 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. P4P) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000037 ( 1 hom. )

Consequence

CCDC40
NM_017950.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: -0.397

Variant links:

Genes affected

CCDC40 (HGNC:26090): (coiled-coil domain 40 molecular ruler complex subunit) This gene encodes a protein that is necessary for motile cilia function. It functions in correct left-right axis formation by regulating the assembly of the inner dynein arm and the dynein regulatory complexes, which control ciliary beat. Mutations in this gene cause ciliary dyskinesia type 15, a disorder due to defects in cilia motility. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2011]

CCDC40 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.059640735).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
CCDC40	NM_017950.4 linkuse as main transcript	c.11C>T	p.Pro4Leu	missense_variant	1/20	ENST00000397545.9
CCDC40	NM_001243342.2 linkuse as main transcript	c.11C>T	p.Pro4Leu	missense_variant	1/18
CCDC40	NM_001330508.2 linkuse as main transcript	c.11C>T	p.Pro4Leu	missense_variant	1/11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CCDC40	ENST00000397545.9 linkuse as main transcript	c.11C>T	p.Pro4Leu	missense_variant	1/20	5	NM_017950.4	P2	Q4G0X9-1

Frequencies

GnomAD3 genomes

AF:

0.00000658

AC:

AN:

151932

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000208

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000608

AC:

AN:

98676

Hom.:

AF XY:

0.0000710

AC XY:

AN XY:

56352

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000233

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000467

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000367

AC:

AN:

1307994

Hom.:

Cov.:

AF XY:

0.0000451

AC XY:

AN XY:

642914

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000530

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000961

Gnomad4 OTH exome

AF:

0.0000185

GnomAD4 genome

AF:

0.00000658

AC:

AN:

151932

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74216

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000208

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000113

ExAC

AF:

0.0000388

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Primary ciliary dyskinesia

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Ambry Genetics	Sep 11, 2019	The p.P4L variant (also known as c.11C>T), located in coding exon 1 of the CCDC40 gene, results from a C to T substitution at nucleotide position 11. The proline at codon 4 is replaced by leucine, an amino acid with similar properties. This amino acid position is well conserved in available vertebrate species; however, leucine is the reference amino acid in other vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Oct 15, 2018	This variant has not been reported in the literature in individuals with CCDC40-related disease. While this variant is present in population databases (rs776947186), the frequency information is unreliable, as metrics indicate poor data quality at this position in the ExAC database. This sequence change replaces proline with leucine at codon 4 of the CCDC40 protein (p.Pro4Leu). The proline residue is moderately conserved and there is a moderate physicochemical difference between proline and leucine. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.38

BayesDel_addAF

Benign

-0.17

BayesDel_noAF

Benign

-0.49

CADD

Benign

DANN

Uncertain

0.98

Eigen

Benign

-0.61

Eigen_PC

Benign

-0.80

FATHMM_MKL

Benign

0.019

LIST_S2

Benign

0.73

T;T;T;T

M_CAP

Benign

0.053

MetaRNN

Benign

0.060

T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.69

N;N;N;N

MutationTaster

Benign

1.0

N;N;N;N

PrimateAI

Uncertain

0.57

PROVEAN

Uncertain

-2.4

N;N;D;D

REVEL

Benign

0.047

Sift

Uncertain

0.0090

D;D;D;D

Sift4G

Uncertain

0.056

T;D;D;D

Polyphen

0.98, 1.0

.;D;.;D

Vest4

0.27

MutPred

0.22

Loss of loop (P = 0.0389);Loss of loop (P = 0.0389);Loss of loop (P = 0.0389);Loss of loop (P = 0.0389);

MVP

0.28

MPC

0.19

ClinPred

0.16

GERP RS

0.74

Varity_R

0.086

gMVP

0.12

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over