NM_178335.3:c.821G>T

Variant names:

• chr3-191375434-G-T
• rs199527848
• NM_178335.3:c.821G>T

Variant summary

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

The NM_178335.3(CCDC50):​c.821G>T​(p.Arg274Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 12/16 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R274Q) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CCDC50 NM_178335.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.82
• Publications: 4 publications found

Genes affected

CCDC50 (HGNC:18111): (coiled-coil domain containing 50) This gene encodes a soluble, cytoplasmic, tyrosine-phosphorylated protein with multiple ubiquitin-interacting domains. Mutations in this gene cause nonsyndromic, postlingual, progressive sensorineural DFNA44 hearing loss. In mouse, the protein is expressed in the inner ear during development and postnatal maturation and associates with microtubule-based structures. This protein may also function as a negative regulator of NF-kB signaling and as an effector of epidermal growth factor (EGF)-mediated cell signaling. Alternative splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Oct 2008]

CCDC50 Gene-Disease associations (from GenCC):

• autosomal dominant nonsyndromic hearing loss 44

  Inheritance: AD, Unknown Classification: STRONG, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), PanelApp Australia
• autosomal dominant nonsyndromic hearing loss

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• nonsyndromic genetic hearing loss

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.06791079).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CCDC50	NM_178335.3	c.821G>T	p.Arg274Leu	missense_variant	Exon 6 of 12	ENST00000392455.9	NP_848018.1
CCDC50	XM_011512460.2	c.821G>T	p.Arg274Leu	missense_variant	Exon 6 of 8		XP_011510762.1
CCDC50	NM_174908.4	c.449-4725G>T		intron_variant	Intron 5 of 10		NP_777568.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CCDC50	ENST00000392455.9	c.821G>T	p.Arg274Leu	missense_variant	Exon 6 of 12	1	NM_178335.3	ENSP00000376249.4
CCDC50	ENST00000392456.4	c.449-4725G>T		intron_variant	Intron 5 of 10	1		ENSP00000376250.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 60

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.33	T
BayesDel_noAF	Benign	-0.71
CADD	Benign	0.016
DANN	Benign	0.95
Eigen	Benign	-1.0
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.032	N
LIST_S2	Benign	0.57	T
M_CAP	Benign	0.0066	T
MetaRNN	Benign	0.068	T
MetaSVM	Benign	-1.0	T
PhyloP100		-1.8
PrimateAI	Benign	0.17	T
Polyphen		0.63	P
MutPred		0.30		Loss of MoRF binding (P = 7e-04);
ClinPred		0.30	T
GERP RS		-4.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
gMVP		0.097
Mutation Taster		=97/3	polymorphism

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

Other links and lift over

dbSNP: rs199527848; hg19: chr3-191093223;