rs202179507

Positions:

• chr17-80099792-C-T

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_Strong BP6 BS2_Supporting

The NM_017950.4(CCDC40):​c.*17C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000661 in 1,611,498 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00039 (1 hom., cov: 33)
  • Exomes 𝑓: 0.00069 (2 hom.)
• Consequence: CCDC40 NM_017950.4 3_prime_UTR
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:1
• Conservation: PhyloP100: -0.388

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 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -6 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.84).
• BP6: Variant 17-80099792-C-T is Benign according to our data. Variant chr17-80099792-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 260944.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=1}.
• BS2: High Homozygotes in GnomAdExome4 at 2 AR geneVariant has number of homozygotes lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CCDC40	NM_017950.4	c.*17C>T		3_prime_UTR_variant	20/20	ENST00000397545.9	NP_060420.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CCDC40	ENST00000397545.9	c.*17C>T		3_prime_UTR_variant	20/20	5	NM_017950.4	ENSP00000380679.4
CCDC40	ENST00000574799.5	n.2983C>T		non_coding_transcript_exon_variant	16/16	1

Frequencies

GnomAD3 genomes AF: 0.000394 AC: 60 AN: 152134 Hom.: 1 Cov.: 33

Gnomad AFR AF: 0.0000966

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

Gnomad ASJ AF: 0.000288

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000765

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.000457 AC: 112 AN: 245342 Hom.: 1 AF XY: 0.000455 AC XY: 61 AN XY: 133926

Gnomad AFR exome AF: 0.000336

Gnomad AMR exome AF: 0.000116

Gnomad ASJ exome AF: 0.000401

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000862

Gnomad OTH exome AF: 0.000500

GnomAD4 exome AF: 0.000689 AC: 1005 AN: 1459246 Hom.: 2 Cov.: 33 AF XY: 0.000698 AC XY: 507 AN XY: 726042

Gnomad4 AFR exome AF: 0.000179

Gnomad4 AMR exome AF: 0.000291

Gnomad4 ASJ exome AF: 0.000383

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000232

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000847

Gnomad4 OTH exome AF: 0.000514

GnomAD4 genome AF: 0.000394 AC: 60 AN: 152252 Hom.: 1 Cov.: 33 AF XY: 0.000296 AC XY: 22 AN XY: 74448

Gnomad4 AFR AF: 0.0000963

Gnomad4 AMR AF: 0.000131

Gnomad4 ASJ AF: 0.000288

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000765

Gnomad4 OTH AF: 0.000473

Alfa AF: 0.000427 Hom.: 0

Bravo AF: 0.000412

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Primary ciliary dyskinesia 15 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
CADD	Benign	5.3
DANN	Benign	0.39

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

Other links and lift over

dbSNP: rs202179507; hg19: chr17-78073591; COSMIC: COSV100162945; COSMIC: COSV100162945;