Genetic Variant CCDC78:c.1054-3T>A (chr16-723939-A-T) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_001378030.1(CCDC78):c.1054-3T>A variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000689 in 1,451,052 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

CCDC78
NM_001378030.1 splice_region, intron

Scores

Splicing: ADA: 0.03331

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.757

Publications

0 publications found

Variant links:

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]

CCDC78 Gene-Disease associations (from GenCC):

congenital myopathy with internal nuclei and atypical cores
Inheritance: AD Classification: SUPPORTIVE, LIMITED Submitted by: G2P, Orphanet, Labcorp Genetics (formerly Invitae)
centronuclear myopathy
Inheritance: AD Classification: LIMITED Submitted by: ClinGen

CCDC78 links:

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ACMG classification

Classification was made for transcript

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 (BayesDel_noAF=-0.86).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001378030.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
CCDC78	NM_001378030.1	MANE Select	c.1054-3T>A	splice_region intron	N/A	NP_001364959.1
CCDC78	NM_001031737.3		c.1054-3T>A	splice_region intron	N/A	NP_001026907.2
CCDC78	NM_001378031.1		c.953+383T>A	intron	N/A	NP_001364960.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
CCDC78	ENST00000345165.10	TSL:5 MANE Select	c.1054-3T>A	splice_region intron	N/A	ENSP00000316851.5
CCDC78	ENST00000293889.10	TSL:1	c.1054-3T>A	splice_region intron	N/A	ENSP00000293889.6
CCDC78	ENST00000478979.5	TSL:2	n.1698T>A	non_coding_transcript_exon	Exon 4 of 4

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.89e-7

AC:

AN:

1451052

Hom.:

Cov.:

AF XY:

0.00000139

AC XY:

AN XY:

720914

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33254

American (AMR)

AF:

0.00

AC:

AN:

43440

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25860

East Asian (EAS)

AF:

0.00

AC:

AN:

39458

South Asian (SAS)

AF:

0.00

AC:

AN:

84900

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51748

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5742

European-Non Finnish (NFE)

AF:

9.04e-7

AC:

AN:

1106756

Other (OTH)

AF:

0.00

AC:

AN:

59894

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.86

CADD

Benign

(source)

DANN

Benign

0.58

PhyloP100

-0.76

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.2

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.033

dbscSNV1_RF

Benign

0.36

SpliceAI score (max)

0.49

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.45

Position offset: 31

DS_AL_spliceai

0.49

Position offset: -3

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

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over