NM_017950.4:c.13G>A

Variant names:

• chr17-80036675-G-A
• NM_017950.4:c.13G>A

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_017950.4(CCDC40):​c.13G>A​(p.Gly5Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000153 in 1,311,206 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000015 (0 hom.)
• Consequence: CCDC40 NM_017950.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.33
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• primary ciliary dyskinesia 15

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, ClinGen, Ambry Genetics, Labcorp Genetics (formerly Invitae), PanelApp Australia, Laboratory for Molecular Medicine
• primary ciliary dyskinesia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• autoimmune disease

  Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.10700929).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CCDC40	NM_017950.4	c.13G>A	p.Gly5Ser	missense_variant	Exon 1 of 20	ENST00000397545.9	NP_060420.2
CCDC40	NM_001243342.2	c.13G>A	p.Gly5Ser	missense_variant	Exon 1 of 18		NP_001230271.1
CCDC40	NM_001330508.2	c.13G>A	p.Gly5Ser	missense_variant	Exon 1 of 11		NP_001317437.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CCDC40	ENST00000397545.9	c.13G>A	p.Gly5Ser	missense_variant	Exon 1 of 20	5	NM_017950.4	ENSP00000380679.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000153 AC: 2 AN: 1311206 Hom.: 0 Cov.: 31 AF XY: 0.00000310 AC XY: 2 AN XY: 644578

African (AFR) AF: 0.00 AC: 0 AN: 27736

American (AMR) AF: 0.00 AC: 0 AN: 27110

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 22748

East Asian (EAS) AF: 0.00 AC: 0 AN: 30260

South Asian (SAS) AF: 0.00 AC: 0 AN: 70294

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 31936

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5150

European-Non Finnish (NFE) AF: 0.00000192 AC: 2 AN: 1041760

Other (OTH) AF: 0.00 AC: 0 AN: 54212

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Primary ciliary dyskinesia Uncertain:1

Apr 09, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 5 of the CCDC40 protein (p.Gly5Ser). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with CCDC40-related conditions. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant  is likely to be tolerated. 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	Benign	0.25
BayesDel_addAF	Benign	-0.098	T
BayesDel_noAF	Benign	-0.38
CADD	Benign	15
DANN	Uncertain	0.98
DEOGEN2	Benign	0.030	.;T;.;.
Eigen	Benign	-0.65
Eigen_PC	Benign	-0.80
FATHMM_MKL	Benign	0.014	N
LIST_S2	Benign	0.69	T;T;T;T
M_CAP	Uncertain	0.13	D
MetaRNN	Benign	0.11	T;T;T;T
MetaSVM	Benign	-0.93	T
MutationAssessor	Benign	0.69	N;N;N;N
PhyloP100		1.3
PrimateAI	Uncertain	0.53	T
PROVEAN	Benign	-0.52	N;N;N;N
REVEL	Benign	0.065
Sift	Benign	0.22	T;T;T;T
Sift4G	Benign	0.19	T;T;T;T
Polyphen		0.48, 0.96	.;P;.;D
Vest4		0.16
MutPred		0.41		Gain of phosphorylation at G5 (P = 0.0035);Gain of phosphorylation at G5 (P = 0.0035);Gain of phosphorylation at G5 (P = 0.0035);Gain of phosphorylation at G5 (P = 0.0035);
MVP		0.31
MPC		0.19
ClinPred		0.28	T
GERP RS		1.8
PromoterAI		0.027	Neutral
Varity_R		0.056
gMVP		0.088
Mutation Taster		=88/12	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

hg19: chr17-78010474;