11-64341726-G-A

Position:

• chr11-64341726-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_032251.6(CCDC88B):​c.659G>A​(p.Arg220His) variant causes a missense change. The variant allele was found at a frequency of 0.000000703 in 1,422,748 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 30)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: CCDC88B NM_032251.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.40

Genes affected

CCDC88B (HGNC:26757): (coiled-coil domain containing 88B) This gene encodes a member of the hook-related protein family. Members of this family are characterized by an N-terminal potential microtubule binding domain, a central coiled-coiled and a C-terminal Hook-related domain. The encoded protein may be involved in linking organelles to microtubules. [provided by RefSeq, Oct 2009]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CCDC88B	NM_032251.6	c.659G>A	p.Arg220His	missense_variant	7/27	ENST00000356786.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CCDC88B	ENST00000356786.10	c.659G>A	p.Arg220His	missense_variant	7/27	1	NM_032251.6	P1
CCDC88B	ENST00000463837.5	n.703G>A		non_coding_transcript_exon_variant	7/25	2
CCDC88B	ENST00000494080.5	n.121G>A		non_coding_transcript_exon_variant	1/20	2

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome AF: 7.03e-7 AC: 1 AN: 1422748 Hom.: 0 Cov.: 35 AF XY: 0.00000142 AC XY: 1 AN XY: 705610

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 9.12e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 30

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

May 05, 2023

The c.659G>A (p.R220H) alteration is located in exon 7 (coding exon 7) of the CCDC88B gene. This alteration results from a G to A substitution at nucleotide position 659, causing the arginine (R) at amino acid position 220 to be replaced by a histidine (H). 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	Uncertain	0.37
BayesDel_addAF	Uncertain	0.042	T
BayesDel_noAF	Benign	-0.18
CADD	Pathogenic	31
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.24	T
Eigen	Uncertain	0.61
Eigen_PC	Uncertain	0.51
FATHMM_MKL	Benign	0.73	D
LIST_S2	Benign	0.83	T
M_CAP	Uncertain	0.14	D
MetaRNN	Uncertain	0.62	D
MetaSVM	Uncertain	-0.18	T
MutationAssessor	Uncertain	2.8	M
MutationTaster	Benign	0.58	D
PrimateAI	Uncertain	0.75	T
PROVEAN	Uncertain	-3.5	D
REVEL	Uncertain	0.32
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.028	D
Polyphen		1.0	D
Vest4		0.61
MutPred		0.32		Loss of MoRF binding (P = 0.0477);
MVP		0.48
MPC		1.0
ClinPred		0.98	D
GERP RS		4.0
Varity_R		0.29
gMVP		0.95

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr11-64109198; COSMIC: COSV57268725; COSMIC: COSV57268725;