NM_178452.6:c.66C>A

Variant names:

• chr16-84145506-C-A
• rs1326703986
• NM_178452.6:c.66C>A

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_178452.6(DNAAF1):​c.66C>A​(p.Pro22Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000142 in 1,410,772 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. P22P) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: DNAAF1 NM_178452.6 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.20
• Publications: 0 publications found

Genes affected

DNAAF1 (HGNC:30539): (dynein axonemal assembly factor 1) The protein encoded by this gene is cilium-specific and is required for the stability of the ciliary architecture. It is involved in the regulation of microtubule-based cilia and actin-based brush border microvilli. Mutations in this gene are associated with primary ciliary dyskinesia-13. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2016]

DNAAF1 Gene-Disease associations (from GenCC):

• primary ciliary dyskinesia 13

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

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.66).
• BP7: Synonymous conserved (PhyloP=-1.2 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DNAAF1	NM_178452.6	c.66C>A	p.Pro22Pro	synonymous_variant	Exon 1 of 12	ENST00000378553.10	NP_848547.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DNAAF1	ENST00000378553.10	c.66C>A	p.Pro22Pro	synonymous_variant	Exon 1 of 12	1	NM_178452.6	ENSP00000367815.5
DNAAF1	ENST00000567918.5	n.66C>A		non_coding_transcript_exon_variant	Exon 1 of 7	1		ENSP00000455154.1
DNAAF1	ENST00000563093.5	n.66C>A		non_coding_transcript_exon_variant	Exon 1 of 11	2		ENSP00000457373.1
DNAAF1	ENST00000570298.5	n.220C>A		non_coding_transcript_exon_variant	Exon 1 of 11	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000142 AC: 2 AN: 1410772 Hom.: 0 Cov.: 31 AF XY: 0.00000144 AC XY: 1 AN XY: 696830

African (AFR) AF: 0.00 AC: 0 AN: 32702

American (AMR) AF: 0.00 AC: 0 AN: 36450

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25206

East Asian (EAS) AF: 0.00 AC: 0 AN: 37566

South Asian (SAS) AF: 0.0000125 AC: 1 AN: 80134

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 49306

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5446

European-Non Finnish (NFE) AF: 9.21e-7 AC: 1 AN: 1085476

Other (OTH) AF: 0.00 AC: 0 AN: 58486

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.66
CADD	Benign	5.6
DANN	Benign	0.77
PhyloP100		-1.2
PromoterAI		0.028	Neutral

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs1326703986; hg19: chr16-84179111;