chr14-91291030-C-G

Variant names:

• chr14-91291030-C-G
• rs786205489
• NM_001080414.4:c.4167G>C

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM2 PP3 PP5_Moderate

The NM_001080414.4(CCDC88C):​c.4167G>C​(p.Met1389Ile) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000694 in 1,440,120 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 Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M1389V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: CCDC88C NM_001080414.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.91
• Publications: 3 publications found

Genes affected

CCDC88C (HGNC:19967): (coiled-coil domain containing 88C) This gene encodes a ubiquitously expressed coiled-coil domain-containing protein that interacts with the dishevelled protein and is a negative regulator of the Wnt signalling pathway. The protein encoded by this gene has a PDZ-domain binding motif in its C-terminus with which it interacts with the dishevelled protein. Dishevelled is a scaffold protein involved in the regulation of the Wnt signaling pathway. The Wnt signaling pathway plays an important role in embryonic development, tissue maintenance, and cancer progression. Mutations in this gene cause autosomal recessive, primary non-syndromic congenital hydrocephalus; a condition characterized by excessive accumulation of cerebrospinal fluid in the ventricles of the brain. [provided by RefSeq, Jan 2013]

CCDC88C Gene-Disease associations (from GenCC):

• hydrocephalus, nonsyndromic, autosomal recessive 1

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: Genomics England PanelApp, G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• spinocerebellar ataxia type 40

  Inheritance: AD Classification: MODERATE, SUPPORTIVE, LIMITED Submitted by: Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.769
• PP5: Variant 14-91291030-C-G is Pathogenic according to our data. Variant chr14-91291030-C-G is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 191051.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CCDC88C	NM_001080414.4	c.4167G>C	p.Met1389Ile	missense_variant	Exon 24 of 30	ENST00000389857.11	NP_001073883.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CCDC88C	ENST00000389857.11	c.4167G>C	p.Met1389Ile	missense_variant	Exon 24 of 30	5	NM_001080414.4	ENSP00000374507.6
CCDC88C	ENST00000555995.1	n.42G>C		non_coding_transcript_exon_variant	Exon 1 of 2	3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.94e-7 AC: 1 AN: 1440120 Hom.: 0 Cov.: 28 AF XY: 0.00000140 AC XY: 1 AN XY: 715060

African (AFR) AF: 0.00 AC: 0 AN: 33308

American (AMR) AF: 0.00 AC: 0 AN: 42074

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25738

East Asian (EAS) AF: 0.00 AC: 0 AN: 39440

South Asian (SAS) AF: 0.00 AC: 0 AN: 83536

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52492

Middle Eastern (MID) AF: 0.000174 AC: 1 AN: 5746

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1098182

Other (OTH) AF: 0.00 AC: 0 AN: 59604

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

-

Genomic Medicine Center of Excellence, King Faisal Specialist Hospital and Research Centre

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.28	D
BayesDel_noAF	Pathogenic	0.17
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.16	T
Eigen	Pathogenic	0.94
Eigen_PC	Pathogenic	0.93
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.92	D
M_CAP	Benign	0.058	D
MetaRNN	Pathogenic	0.77	D
MetaSVM	Uncertain	-0.15	T
MutationAssessor	Uncertain	2.8	M
PhyloP100		7.9
PrimateAI	Pathogenic	0.85	D
PROVEAN	Uncertain	-3.6	D
REVEL	Uncertain	0.48
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.0090	D
Polyphen		0.99	D
Vest4		0.75
MutPred		0.22		Loss of ubiquitination at K1393 (P = 0.0877);
MVP		0.78
MPC		0.62
ClinPred		0.99	D
GERP RS		6.1
Varity_R		0.70
gMVP		0.40
Mutation Taster		=23/77	disease causing (ClinVar)

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: rs786205489; hg19: chr14-91757374;