Genetic Variant CCDC39:p.Arg876Gly (chr3-180616324-G-C) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_181426.2(CCDC39):c.2626C>G(p.Arg876Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,020 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R876C) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

CCDC39
NM_181426.2 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.486

Publications

0 publications found

Variant links:

Genes affected

CCDC39 (HGNC:25244): (coiled-coil domain 39 molecular ruler complex subunit) The protein encoded by this gene is involved in the motility of cilia and flagella. The encoded protein is essential for the assembly of dynein regulatory and inner dynein arm complexes, which regulate ciliary beat. Defects in this gene are a cause of primary ciliary dyskinesia type 14 (CILD14). [provided by RefSeq, Jul 2011]

CCDC39 links:

TTC14 (HGNC:24697): (tetratricopeptide repeat domain 14) Predicted to enable nucleic acid binding activity. [provided by Alliance of Genome Resources, Apr 2022]

TTC14 links:

ENSG00000145075 (HGNC:):

ENSG00000145075 links:

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ACMG classification

Classification was made for transcript

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=0.047694087).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_181426.2. 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
	CCDC39	NM_181426.2	MANE Select	c.2626C>G	p.Arg876Gly	missense	Exon 19 of 20	NP_852091.1
	TTC14	NM_001288582.2		c.1775-1056G>C		intron	N/A	NP_001275511.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
CCDC39	ENST00000476379.6	TSL:2 MANE Select	c.2626C>G	p.Arg876Gly	missense	Exon 19 of 20	ENSP00000417960.2
TTC14	ENST00000382584.8	TSL:1	c.1775-1056G>C		intron	N/A	ENSP00000372027.4
CCDC39	ENST00000651046.1		c.2434C>G	p.Arg812Gly	missense	Exon 18 of 19	ENSP00000499175.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461020

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726782

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33438

American (AMR)

AF:

0.00

AC:

AN:

44634

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26108

East Asian (EAS)

AF:

0.00

AC:

AN:

39692

South Asian (SAS)

AF:

0.00

AC:

AN:

86216

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53384

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

9.00e-7

AC:

AN:

1111438

Other (OTH)

AF:

0.00

AC:

AN:

60348

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.088

BayesDel_addAF

Benign

-0.18

BayesDel_noAF

Benign

-0.50

CADD

Benign

7.8

(source)

DANN

Benign

0.82

DEOGEN2

Benign

0.00084

Eigen

Benign

-0.81

Eigen_PC

Benign

-0.81

FATHMM_MKL

Benign

0.086

LIST_S2

Benign

0.49

M_CAP

Benign

0.0050

MetaRNN

Benign

0.048

MetaSVM

Benign

-1.0

MutationAssessor

Uncertain

2.1

PhyloP100

0.49

PrimateAI

Benign

0.19

PROVEAN

Uncertain

-2.5

REVEL

Benign

0.059

Sift

Benign

0.062

Sift4G

Benign

0.073

Polyphen

0.0

Vest4

0.056

MutPred

0.22

Loss of loop (P = 0.0022)

MVP

0.12

MPC

0.079

ClinPred

0.14

GERP RS

4.0

PromoterAI

-0.032

Neutral

(source)

Varity_R

0.090

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.19

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over