2-112740822-G-A

Position:

chr2-112740822-G-A

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2BP4_StrongBS1_Supporting

The NM_152515.5(CKAP2L):c.2008C>T(p.Pro670Ser) variant causes a missense change. The variant allele was found at a frequency of 0.0000237 in 1,606,648 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000053 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000021 ( 1 hom. )

Consequence

CKAP2L
NM_152515.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 4.38

Variant links:

Genes affected

CKAP2L (HGNC:26877): (cytoskeleton associated protein 2 like) The protein encoded by this gene is thought to be a mitotic spindle protein important to neural stem or progenitor cells. Mutations in this gene have been associated with spindle organization defects, including mitotic spindle defects, lagging chromosomes, and chromatin bridges. There is evidence that mutations in this gene are associated with Filippi syndrome, characterized by growth defects, microcephaly, intellectual disability, facial feature defects, and syndactyly. There is a pseudogene of this gene on chromosome 20. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2015]

CKAP2L links:

NT5DC4 (HGNC:27678): (5'-nucleotidase domain containing 4) Predicted to enable 5'-nucleotidase activity. Predicted to be involved in dephosphorylation. [provided by Alliance of Genome Resources, Apr 2022]

NT5DC4 links:

CKAP2L (HGNC:):

CKAP2L links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.058881164).

BS1

Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.0000526 (8/152092) while in subpopulation EAS AF= 0.00154 (8/5202). AF 95% confidence interval is 0.000764. There are 0 homozygotes in gnomad4. There are 6 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CKAP2L	NM_152515.5 linkuse as main transcript	c.2008C>T	p.Pro670Ser	missense_variant	8/9	ENST00000302450.11	NP_689728.3	Q8IYA6-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CKAP2L	ENST00000302450.11 linkuse as main transcript	c.2008C>T	p.Pro670Ser	missense_variant	8/9	1	NM_152515.5	ENSP00000305204.6		Q8IYA6-1

Frequencies

GnomAD3 genomes

AF:

0.0000526

AC:

AN:

152092

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00154

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000104

AC:

AN:

250002

Hom.:

AF XY:

0.0000888

AC XY:

AN XY:

135094

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000292

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00125

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000177

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000206

AC:

AN:

1454556

Hom.:

Cov.:

AF XY:

0.0000152

AC XY:

AN XY:

722396

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000225

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000658

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000181

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000526

AC:

AN:

152092

Hom.:

Cov.:

AF XY:

0.0000808

AC XY:

AN XY:

74298

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00154

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000491

ExAC

AF:

0.0000824

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 28, 2023

The c.2008C>T (p.P670S) alteration is located in exon 8 (coding exon 8) of the CKAP2L gene. This alteration results from a C to T substitution at nucleotide position 2008, causing the proline (P) at amino acid position 670 to be replaced by a serine (S). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 25, 2022

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. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). ClinVar contains an entry for this variant (Variation ID: 1381276). This variant has not been reported in the literature in individuals affected with CKAP2L-related conditions. This variant is present in population databases (rs753333699, gnomAD 0.1%), including at least one homozygous and/or hemizygous individual. This sequence change replaces proline, which is neutral and non-polar, with serine, which is neutral and polar, at codon 670 of the CKAP2L protein (p.Pro670Ser). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.26

BayesDel_addAF

Benign

-0.090

BayesDel_noAF

Uncertain

0.10

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.14

Eigen

Pathogenic

0.75

Eigen_PC

Pathogenic

0.69

FATHMM_MKL

Uncertain

0.91

LIST_S2

Benign

0.78

M_CAP

Benign

0.015

MetaRNN

Benign

0.059

MetaSVM

Benign

-0.36

MutationAssessor

Pathogenic

3.2

PrimateAI

Benign

0.48

PROVEAN

Uncertain

-3.8

REVEL

Uncertain

0.33

Sift

Benign

0.030

Sift4G

Benign

0.095

Polyphen

1.0

Vest4

0.25

MutPred

0.62

Loss of sheet (P = 0.0457);

MVP

0.38

MPC

0.33

ClinPred

0.60

GERP RS

5.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Varity_R

0.19

gMVP

0.48

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over