NM_018076.5:c.1267_1268delGT

Variant names:

• chr10-27961685-AAC-A
• rs1409069267
• NM_018076.5:c.1267_1268delGT

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_018076.5(ODAD2):​c.1267_1268delGT​(p.Val423fs) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000028 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: ODAD2 NM_018076.5 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 1.60
• Publications: 0 publications found

Genes affected

ODAD2 (HGNC:25583): (outer dynein arm docking complex subunit 2) The protein encoded by this gene contains ten Armadillo repeat motifs (ARMs) and one HEAT repeat, and is thought to be involved in ciliary and flagellar movement. This protein has been shown to localize to the ciliary axonemes and at the ciliary base of respiratory cells. Studies indicate that mutations in this gene cause partial outer dynein arm (ODA) defects in respiratory cilia. The cilia of cells with mutations in this gene displayed either reduced ciliary beat frequency and amplitude, or, complete immotility. Some individuals with primary ciliary dyskensia (PCD) have been shown to have mutations in this gene. PCD is characterized by chronic airway disease and left/right body asymmetry defects. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Aug 2015]

ODAD2 Gene-Disease associations (from GenCC):

• primary ciliary dyskinesia 23

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, ClinGen, Labcorp Genetics (formerly Invitae)
• primary ciliary dyskinesia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 10-27961685-AAC-A is Pathogenic according to our data. Variant chr10-27961685-AAC-A is described in ClinVar as Pathogenic. ClinVar VariationId is 474571.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ODAD2	NM_018076.5	c.1267_1268delGT	p.Val423fs	frameshift_variant	Exon 10 of 20	ENST00000305242.10	NP_060546.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ODAD2	ENST00000305242.10	c.1267_1268delGT	p.Val423fs	frameshift_variant	Exon 10 of 20	1	NM_018076.5	ENSP00000306410.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000275 AC: 4 AN: 1454336 Hom.: 0 AF XY: 0.00000276 AC XY: 2 AN XY: 723586

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33168

American (AMR) AF: 0.00 AC: 0 AN: 44090

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25740

East Asian (EAS) AF: 0.0000252 AC: 1 AN: 39632

South Asian (SAS) AF: 0.00 AC: 0 AN: 85178

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53268

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5726

European-Non Finnish (NFE) AF: 0.00000271 AC: 3 AN: 1107474

Other (OTH) AF: 0.00 AC: 0 AN: 60060

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.00209061), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000113

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Primary ciliary dyskinesia 23 Pathogenic:1

Aug 16, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 474571). This variant has not been reported in the literature in individuals affected with ARMC4-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Val423*) in the ARMC4 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in ARMC4 are known to be pathogenic (PMID: 23849778). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		1.6
Mutation Taster		=2/198	disease causing (ClinVar)

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: rs1409069267; hg19: chr10-28250614;