chr7-727076-CCGCGCTCGCCG-C

Variant names:

• chr7-727076-CCGCGCTCGCCG-C
• rs1554248794
• NM_017802.4:c.363_373delCGCCGCGCGCT

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1 PP5_Moderate

The NM_017802.4(DNAAF5):​c.363_373delCGCCGCGCGCT​(p.Ala122GlyfsTer14) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type DEL_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: DNAAF5 NM_017802.4 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 2.44
• Publications: 0 publications found

Genes affected

DNAAF5 (HGNC:26013): (dynein axonemal assembly factor 5) The protein encoded by this gene is essential for the preassembly or stability of axonemal dynein arms, and is found only in organisms with motile cilia and flagella. Mutations in this gene are associated with primary ciliary dyskinesia-18, a disorder characterized by abnormalities of motile cilia. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Feb 2013]

PRKAR1B (HGNC:9390): (protein kinase cAMP-dependent type I regulatory subunit beta) The protein encoded by this gene is a regulatory subunit of cyclic AMP-dependent protein kinase A (PKA), which is involved in the signaling pathway of the second messenger cAMP. Two regulatory and two catalytic subunits form the PKA holoenzyme, disbands after cAMP binding. The holoenzyme is involved in many cellular events, including ion transport, metabolism, and transcription. Several transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Aug 2015]

PRKAR1B Gene-Disease associations (from GenCC):

• Marbach-Schaaf neurodevelopmental syndrome

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• PRKAR1B-related neurodegenerative dementia with intermediate filaments

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PP5: Variant 7-727076-CCGCGCTCGCCG-C is Pathogenic according to our data. Variant chr7-727076-CCGCGCTCGCCG-C is described in ClinVar as Pathogenic. ClinVar VariationId is 454864.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_017802.4. 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
	DNAAF5	NM_017802.4	MANE Select	c.363_373delCGCCGCGCGCT	p.Ala122GlyfsTer14	frameshift	Exon 1 of 13	NP_060272.3
	PRKAR1B	NM_001164760.2	MANE Select	c.-23+123_-23+133delCGGCGAGCGCG		intron	N/A	NP_001158232.1
	DNAAF5	NR_075098.2		n.385_395delCGCCGCGCGCT		non_coding_transcript_exon	Exon 1 of 13

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DNAAF5	ENST00000297440.11	TSL:1 MANE Select	c.363_373delCGCCGCGCGCT	p.Ala122GlyfsTer14	frameshift	Exon 1 of 13	ENSP00000297440.6
	PRKAR1B	ENST00000537384.6	TSL:5 MANE Select	c.-23+123_-23+133delCGGCGAGCGCG		intron	N/A	ENSP00000440449.1
	PRKAR1B	ENST00000403562.5	TSL:1	c.-23+503_-23+513delCGGCGAGCGCG		intron	N/A	ENSP00000385349.1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Primary ciliary dyskinesia Pathogenic:1

Feb 09, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant has not been reported in the literature in individuals with DNAAF5-related conditions. ClinVar contains an entry for this variant (Variation ID: 454864). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate insufficient coverage at this position in the ExAC database. This sequence change creates a premature translational stop signal (p.Ala122Glyfs*14) in the DNAAF5 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in DNAAF5 are known to be pathogenic (PMID: 24307375, 25232951). For these reasons, this variant has been classified as Pathogenic.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		2.4
Mutation Taster		=4/196	disease causing (ClinVar)

Splicing

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

Other links and lift over

dbSNP: rs1554248794; hg19: chr7-766713;