rs200154277

Positions:

• chr16-724412-C-T

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BS2

The NM_001378030.1(CCDC78):​c.863G>A​(p.Arg288His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000925 in 1,610,126 control chromosomes in the GnomAD database, including 1 homozygotes. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.00027 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000074 (1 hom.)
• Consequence: CCDC78 NM_001378030.1 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 2.90

Genes affected

CCDC78 (HGNC:14153): (coiled-coil domain containing 78) Involved in de novo centriole assembly involved in multi-ciliated epithelial cell differentiation and skeletal muscle contraction. Located in several cellular components, including centriole; deuterosome; and sarcolemma. Implicated in centronuclear myopathy 4. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Likely_benign. Variant got -4 ACMG points.

• BS2: High AC in GnomAd4 at 41 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CCDC78	NM_001378030.1	c.863G>A	p.Arg288His	missense_variant	9/14	ENST00000345165.10	NP_001364959.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CCDC78	ENST00000345165.10	c.863G>A	p.Arg288His	missense_variant	9/14	5	NM_001378030.1	ENSP00000316851	A2

Frequencies

GnomAD3 genomes AF: 0.000256 AC: 39 AN: 152248 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.000724

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000196

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: 0.0000882

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000115 AC: 28 AN: 243610 Hom.: 0 AF XY: 0.000150 AC XY: 20 AN XY: 132904

Gnomad AFR exome AF: 0.000637

Gnomad AMR exome AF: 0.0000871

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000655

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000110

Gnomad OTH exome AF: 0.000167

GnomAD4 exome AF: 0.0000741 AC: 108 AN: 1457760 Hom.: 1 Cov.: 35 AF XY: 0.0000758 AC XY: 55 AN XY: 725312

Gnomad4 AFR exome AF: 0.000926

Gnomad4 AMR exome AF: 0.0000447

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.0000464

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000459

Gnomad4 OTH exome AF: 0.000199

GnomAD4 genome AF: 0.000269 AC: 41 AN: 152366 Hom.: 0 Cov.: 33 AF XY: 0.000268 AC XY: 20 AN XY: 74500

Gnomad4 AFR AF: 0.000770

Gnomad4 AMR AF: 0.000196

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000882

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000248 Hom.: 0

Bravo AF: 0.000272

ESP6500AA AF: 0.000455 AC: 2

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.000116 AC: 14

Asia WGS AF: 0.000289 AC: 1 AN: 3478

EpiCase AF: 0.0000545

EpiControl AF: 0.000178

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Congenital myopathy with internal nuclei and atypical cores Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Oct 31, 2018	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 12, 2024	This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 288 of the CCDC78 protein (p.Arg288His). This variant is present in population databases (rs200154277, gnomAD 0.06%), and has an allele count higher than expected for a pathogenic variant. This variant has not been reported in the literature in individuals affected with CCDC78-related conditions. ClinVar contains an entry for this variant (Variation ID: 473268). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on CCDC78 protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.32
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.12
CADD	Pathogenic	31
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.32	T
Eigen	Uncertain	0.19
Eigen_PC	Benign	0.22
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Uncertain	0.87	D
M_CAP	Uncertain	0.12	D
MetaRNN	Uncertain	0.42	T
MetaSVM	Benign	-0.68	T
MutationAssessor	Uncertain	2.8	M
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.57	T
PROVEAN	Uncertain	-3.9	D
REVEL	Benign	0.29
Sift	Uncertain	0.0030	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.70
MVP		0.31
MPC		0.42
ClinPred		0.21	T
GERP RS		4.2
Varity_R		0.28
gMVP		0.47

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

LitVar

Other links and lift over

dbSNP: rs200154277; hg19: chr16-774412;