NM_021254.4:c.308-8T>G

Variant names:

• chr21-32607724-A-C
• rs768630554
• NM_021254.4:c.308-8T>G

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 2P and 6B. PM2 BP4_Strong BP6_Moderate

The NM_021254.4(CFAP298):​c.308-8T>G variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000257 in 1,557,474 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 31)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: CFAP298 NM_021254.4 splice_region, intron
• Scores: Splicing: ADA: 0.002335
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.119
• Publications: 0 publications found

Genes affected

CFAP298 (HGNC:1301): (cilia and flagella associated protein 298) This gene encodes a protein that plays a critical role in dynein arm assembly and motile cilia function. Mutations in this gene result in primary ciliary dyskinesia. Naturally occuring readthrough transcription occurs from this locus to the downstream t-complex 10 like (TCP10L) gene. [provided by RefSeq, Apr 2017]

CFAP298-TCP10L (HGNC:54636): (CFAP298-TCP10L readthrough) This locus represents naturally occurring readthrough transcription between the neighboring chromosome 21 open reading frame 59 (C21orf59) and TCP10L (t-complex 10 like) genes on chromosome 21. Readthrough transcripts may encode a fusion protein that shares sequence identity with each individual gene product. [provided by RefSeq, Apr 2017]

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.82).
• BP6: Variant 21-32607724-A-C is Benign according to our data. Variant chr21-32607724-A-C is described in ClinVar as Likely_benign. ClinVar VariationId is 454922.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_021254.4. 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
	CFAP298	NM_021254.4	MANE Select	c.308-8T>G		splice_region intron	N/A	NP_067077.1
	CFAP298-TCP10L	NM_001350338.2		c.308-8T>G		splice_region intron	N/A	NP_001337267.1
	CFAP298	NM_001350337.2		c.308-8T>G		splice_region intron	N/A	NP_001337266.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CFAP298	ENST00000290155.8	TSL:1 MANE Select	c.308-8T>G		splice_region intron	N/A	ENSP00000290155.3
	CFAP298-TCP10L	ENST00000673807.1		c.308-8T>G		splice_region intron	N/A	ENSP00000501088.1
	CFAP298	ENST00000382549.8	TSL:1	c.308-8T>G		splice_region intron	N/A	ENSP00000371989.4

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152186 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.00000423 AC: 1 AN: 236612 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000323

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000213 AC: 3 AN: 1405288 Hom.: 0 Cov.: 24 AF XY: 0.00000142 AC XY: 1 AN XY: 701910

African (AFR) AF: 0.00 AC: 0 AN: 31606

American (AMR) AF: 0.0000714 AC: 3 AN: 42020

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25528

East Asian (EAS) AF: 0.00 AC: 0 AN: 39312

South Asian (SAS) AF: 0.00 AC: 0 AN: 82478

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52296

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5594

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1067954

Other (OTH) AF: 0.00 AC: 0 AN: 58500

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152186 Hom.: 0 Cov.: 31 AF XY: 0.0000135 AC XY: 1 AN XY: 74342

African (AFR) AF: 0.00 AC: 0 AN: 41442

American (AMR) AF: 0.0000655 AC: 1 AN: 15270

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3468

East Asian (EAS) AF: 0.00 AC: 0 AN: 5198

South Asian (SAS) AF: 0.00 AC: 0 AN: 4826

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10622

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 68040

Other (OTH) AF: 0.00 AC: 0 AN: 2092

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000227

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Benign:1

Jan 19, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.82
CADD	Benign	1.9
DANN	Benign	0.69
PhyloP100		0.12
PromoterAI		-0.0010	Neutral

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.0023
dbscSNV1_RF	Benign	0.098
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: rs768630554; hg19: chr21-33980034;