21-44333224-C-T

Variant names:

• chr21-44333224-C-T
• rs1057518441
• NM_004928.3:c.182G>A

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1 PM2 PP3_Moderate

The NM_004928.3(CFAP410):​c.182G>A​(p.Cys61Tyr) variant causes a missense change. The variant allele was found at a frequency of 0.000000685 in 1,460,412 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: CFAP410 NM_004928.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter P:1 U:1
• Conservation: PhyloP100: 7.18

Genes affected

CFAP410 (HGNC:1260): (cilia and flagella associated protein 410) Four alternatively spliced transcript variants encoding four different isoforms have been found for this nuclear gene. All isoforms contain leucine-rich repeats. Three of these isoforms are mitochondrial proteins and one of them lacks the target peptide, so is not located in mitochondrion. This gene is down-regulated in Down syndrome (DS) brain, which may represent mitochondrial dysfunction in DS patients. [provided by RefSeq, Sep 2012]

ENSG00000184441 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM1: In a chain Cilia- and flagella-associated protein 410 (size 255) in uniprot entity CF410_HUMAN there are 22 pathogenic changes around while only 9 benign (71%) in NM_004928.3
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.924

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CFAP410	NM_004928.3	c.182G>A	p.Cys61Tyr	missense_variant	Exon 4 of 7	ENST00000339818.9	NP_004919.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CFAP410	ENST00000339818.9	c.182G>A	p.Cys61Tyr	missense_variant	Exon 4 of 7	1	NM_004928.3	ENSP00000344566.4

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460412 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 726448

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: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Retinal dystrophy with or without macular staphyloma Pathogenic:1

Jul 17, 2018

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

not specified Uncertain:1

Nov 30, 2016

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The C61Y variant in the C21orf2 gene has been reported previously in homozygous state in an individual with early-onset retinal dystrophy and short stature (Khan et al., 2015). The C61Y variant was not observed in approximately 6500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The C61Y variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is conserved across species. In silico analysis predicts this variant is probably damaging to the protein structure/function.We interpret C61Y as a variant of uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.11
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Benign	0.12	T;.;.
Eigen	Pathogenic	0.84
Eigen_PC	Pathogenic	0.73
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Uncertain	0.92	D;D;D
M_CAP	Uncertain	0.090	D
MetaRNN	Pathogenic	0.92	D;D;D
MetaSVM	Benign	-0.84	T
PROVEAN	Pathogenic	-11	D;D;D
REVEL	Uncertain	0.60
Sift	Pathogenic	0.0	D;D;D
Sift4G	Uncertain	0.0040	D;D;D
Polyphen		1.0	D;.;.
Vest4		0.95
MutPred		0.65		Gain of MoRF binding (P = 0.0845);Gain of MoRF binding (P = 0.0845);Gain of MoRF binding (P = 0.0845);
MVP		0.49
MPC		0.52
ClinPred		1.0	D
GERP RS		4.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.96
gMVP		0.75

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs1057518441; hg19: chr21-45753107;