7-726775-G-T

Variant names:

• chr7-726775-G-T
• NM_017802.4:c.55G>T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_017802.4(DNAAF5):​c.55G>T​(p.Ala19Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000268 in 1,117,888 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: DNAAF5 NM_017802.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.845

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]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.06066215).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DNAAF5	NM_017802.4	c.55G>T	p.Ala19Ser	missense_variant	Exon 1 of 13	ENST00000297440.11	NP_060272.3
PRKAR1B	NM_001164760.2	c.-23+435C>A		intron_variant	Intron 1 of 10	ENST00000537384.6	NP_001158232.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DNAAF5	ENST00000297440.11	c.55G>T	p.Ala19Ser	missense_variant	Exon 1 of 13	1	NM_017802.4	ENSP00000297440.6
PRKAR1B	ENST00000537384.6	c.-23+435C>A		intron_variant	Intron 1 of 10	5	NM_001164760.2	ENSP00000440449.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000268 AC: 3 AN: 1117888 Hom.: 0 Cov.: 31 AF XY: 0.00000562 AC XY: 3 AN XY: 533784

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0000424

Gnomad4 NFE exome AF: 0.00000212

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Primary ciliary dyskinesia Uncertain:1

Oct 16, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 19 of the DNAAF5 protein (p.Ala19Ser). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with DNAAF5-related conditions. ClinVar contains an entry for this variant (Variation ID: 1467641). Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.091
BayesDel_addAF	Benign	-0.27	T
BayesDel_noAF	Benign	-0.63
CADD	Benign	7.4
DANN	Benign	0.75
DEOGEN2	Benign	0.020	T
Eigen	Benign	-0.83
Eigen_PC	Benign	-0.94
FATHMM_MKL	Benign	0.029	N
LIST_S2	Benign	0.29	T
M_CAP	Benign	0.016	T
MetaRNN	Benign	0.061	T
MetaSVM	Benign	-1.0	T
PrimateAI	Pathogenic	0.83	D
PROVEAN	Benign	0.44	N
REVEL	Benign	0.023
Sift	Benign	0.49	T
Sift4G	Benign	0.52	T
Polyphen		0.21	B
Vest4		0.078
MutPred		0.11		Gain of glycosylation at A19 (P = 0.0038);
MVP		0.030
MPC		0.15
ClinPred		0.22	T
GERP RS		1.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.048
gMVP		0.40

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr7-766412;