NM_017950.4:c.1949A>C

Variant names:

• chr17-80082018-A-C
• rs201064110
• NM_017950.4:c.1949A>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_017950.4(CCDC40):​c.1949A>C​(p.Asn650Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N650S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 26)
• Consequence: CCDC40 NM_017950.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.393
• Publications: 2 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: Labcorp Genetics (formerly Invitae), ClinGen, G2P, Ambry Genetics, 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: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.045072585).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_017950.4. 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
	CCDC40	NM_017950.4	MANE Select	c.1949A>C	p.Asn650Thr	missense	Exon 12 of 20	NP_060420.2
	CCDC40	NM_001243342.2		c.1949A>C	p.Asn650Thr	missense	Exon 12 of 18	NP_001230271.1	Q4G0X9-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CCDC40	ENST00000397545.9	TSL:5 MANE Select	c.1949A>C	p.Asn650Thr	missense	Exon 12 of 20	ENSP00000380679.4	Q4G0X9-1
	CCDC40	ENST00000574799.5	TSL:1	n.1486A>C		non_coding_transcript_exon	Exon 8 of 16
	CCDC40	ENST00000897784.1		c.1949A>C	p.Asn650Thr	missense	Exon 12 of 21	ENSP00000567843.1

Frequencies

GnomAD3 genomes Cov.: 26

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 26

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Primary ciliary dyskinesia (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.30	T
BayesDel_noAF	Benign	-0.67
CADD	Benign	9.3
DANN	Benign	0.90
DEOGEN2	Benign	0.071	T
Eigen	Benign	-0.92
Eigen_PC	Benign	-0.91
FATHMM_MKL	Benign	0.034	N
LIST_S2	Benign	0.62	T
M_CAP	Benign	0.0085	T
MetaRNN	Benign	0.045	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.0	L
PhyloP100		-0.39
PrimateAI	Benign	0.26	T
PROVEAN	Benign	-0.99	N
REVEL	Benign	0.050
Sift	Benign	0.51	T
Sift4G	Benign	0.57	T
Polyphen		0.11	B
Vest4		0.21
MutPred		0.21		Gain of phosphorylation at T646 (P = 0.0923)
MVP		0.061
MPC		0.20
ClinPred		0.048	T
GERP RS		-5.2
Varity_R		0.038
gMVP		0.072
Mutation Taster		=98/2	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: rs201064110; hg19: chr17-78055817;