Genetic Variant CDK13:p.Gly12ArgfsTer124 (chr7-39950667-T-TG) – ACMG Classification: Pathogenic (10 pts)

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1PM2

The NM_003718.5(CDK13):c.32dupG(p.Gly12ArgfsTer124) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000817 in 1,223,626 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 8.2e-7 ( 0 hom. )

Consequence

CDK13
NM_003718.5 frameshift

Scores

Not classified

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.09

Publications

0 publications found

Variant links:

Genes affected

CDK13 (HGNC:1733): (cyclin dependent kinase 13) The protein encoded by this gene is a member of the cyclin-dependent serine/threonine protein kinase family. Members of this family are well known for their essential roles as master switches in cell cycle control. The exact function of this protein has not yet been determined, but it may play a role in mRNA processing and may be involved in regulation of hematopoiesis. Alternatively spliced transcript variants have been described.[provided by RefSeq, Dec 2009]

CDK13 Gene-Disease associations (from GenCC):

congenital heart defects, dysmorphic facial features, and intellectual developmental disorder
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Illumina
syndromic intellectual disability
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen

CDK13 links:

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ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 10 ACMG points.

PVS1

Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 90 pathogenic variants in the truncated region.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CDK13	NM_003718.5 link	c.32dupG	p.Gly12ArgfsTer124	frameshift_variant	Exon 1 of 14	ENST00000181839.10	NP_003709.3	Q14004-1A0A024RA85Q9BVE2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CDK13	ENST00000181839.10 link	c.32dupG	p.Gly12ArgfsTer124	frameshift_variant	Exon 1 of 14	1	NM_003718.5	ENSP00000181839.4		Q14004-1
CDK13	ENST00000340829.10 link	c.32dupG	p.Gly12ArgfsTer124	frameshift_variant	Exon 1 of 14	1		ENSP00000340557.5		Q14004-2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

8.17e-7

AC:

AN:

1223626

Hom.:

Cov.:

AF XY:

0.00000168

AC XY:

AN XY:

595770

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

24438

American (AMR)

AF:

0.00

AC:

AN:

13046

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

17942

East Asian (EAS)

AF:

0.00

AC:

AN:

27328

South Asian (SAS)

AF:

0.00

AC:

AN:

55882

European-Finnish (FIN)

AF:

0.00

AC:

AN:

30640

Middle Eastern (MID)

AF:

0.00

AC:

AN:

3466

European-Non Finnish (NFE)

AF:

9.99e-7

AC:

AN:

1000670

Other (OTH)

AF:

0.00

AC:

AN:

50214

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.225

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Jan 16, 2024

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); Frameshift variant predicted to result in protein truncation or nonsense mediated decay in a gene or region of a gene for which loss of function is not a well-established mechanism of disease; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

1.1

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

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7-39950667-TG-TGG

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over