3-46923616-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_001277074.2(CCDC12):c.297C>G(p.Ile99Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000691 in 1,447,162 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 11/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: CCDC12 NM_001277074.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.479

Genes affected

CCDC12 (HGNC:28332): (coiled-coil domain containing 12) Predicted to be part of U2-type spliceosomal complex and post-mRNA release spliceosomal complex. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.843

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CCDC12	NM_001277074.2	c.297C>G	p.Ile99Met	missense_variant	4/7	ENST00000683445.1
CCDC12	NM_144716.6	c.336C>G	p.Ile112Met	missense_variant	5/8
CCDC12	NR_102269.2	n.350C>G		non_coding_transcript_exon_variant	4/7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CCDC12	ENST00000683445.1	c.297C>G	p.Ile99Met	missense_variant	4/7		NM_001277074.2	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.91e-7 AC: 1 AN: 1447162 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 718820

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000231

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 17, 2023

The c.336C>G (p.I112M) alteration is located in exon 4 (coding exon 4) of the CCDC12 gene. This alteration results from a C to G substitution at nucleotide position 336, causing the isoleucine (I) at amino acid position 112 to be replaced by a methionine (M). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.21
BayesDel_addAF	Benign	0.0027	T
BayesDel_noAF	Benign	-0.23
Cadd	Benign	4.3
Dann	Benign	0.91
DEOGEN2	Benign	0.059	T;.
Eigen	Benign	-0.62
Eigen_PC	Benign	-0.87
FATHMM_MKL	Benign	0.42	N
LIST_S2	Uncertain	0.88	D;D
M_CAP	Benign	0.036	D
MetaRNN	Pathogenic	0.84	D;D
MetaSVM	Benign	-0.58	T
MutationAssessor	Uncertain	2.9	M;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.55	T
REVEL	Uncertain	0.53
Sift4G	Uncertain	0.045	D;D
Polyphen		0.88	P;.
Vest4		0.57
MutPred		0.58		Gain of relative solvent accessibility (P = 0.0483);.;
MVP		0.51
MPC		0.43
ClinPred		0.97	D
GERP RS		-6.9
RBP_binding_hub_radar		0.92
RBP_regulation_power_radar		2.6
Varity_R		0.13
gMVP		0.12

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: rs141076138; hg19: chr3-46965106;