Genetic Variant CFAP300:p.Ala45Ala (chr11-102047839-G-C) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2BP4_StrongBP7

The NM_032930.3(CFAP300):c.135G>C(p.Ala45Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,872 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. A45A) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

CFAP300
NM_032930.3 synonymous

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.973

Publications

0 publications found

Variant links:

Genes affected

CFAP300 (HGNC:28188): (cilia and flagella associated protein 300) Predicted to be located in cytoplasm and motile cilium. Implicated in primary ciliary dyskinesia 38. [provided by Alliance of Genome Resources, Apr 2022]

CFAP300 Gene-Disease associations (from GenCC):

ciliary dyskinesia, primary, 38
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: ClinGen, G2P, Labcorp Genetics (formerly Invitae)
primary ciliary dyskinesia
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

CFAP300 links:

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ACMG classification

Classification was made for transcript

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=-0.51).

BP7

Synonymous conserved (PhyloP=-0.973 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_032930.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
CFAP300	NM_032930.3	MANE Select	c.135G>C	p.Ala45Ala	synonymous	Exon 2 of 7	NP_116319.2	Q9BRQ4-1
CFAP300	NM_001441265.1		c.135G>C	p.Ala45Ala	synonymous	Exon 2 of 6	NP_001428194.1
CFAP300	NM_001363505.2		c.135G>C	p.Ala45Ala	synonymous	Exon 2 of 6	NP_001350434.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
CFAP300	ENST00000434758.7	TSL:2 MANE Select	c.135G>C	p.Ala45Ala	synonymous	Exon 2 of 7	ENSP00000414390.2	Q9BRQ4-1
CFAP300	ENST00000534360.1	TSL:1	c.135G>C	p.Ala45Ala	synonymous	Exon 2 of 4	ENSP00000435482.1	Q9BRQ4-3
CFAP300	ENST00000530659.1	TSL:1	n.372G>C		non_coding_transcript_exon	Exon 1 of 6

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461872

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727234

show subpopulations

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

African (AFR)

AF:

0.00

AC:

AN:

33478

American (AMR)

AF:

0.00

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86252

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53418

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1112006

Other (OTH)

AF:

0.00

AC:

AN:

60396

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.51

CADD

Benign

8.9

(source)

DANN

Benign

0.82

PhyloP100

-0.97

PromoterAI

0.0052

Neutral

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over