rs281865468

Positions:

• chr17-46171228-G-A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_015443.4(KANSL1):​c.916C>T​(p.Gln306*) variant causes a stop gained change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 35)
• Consequence: KANSL1 NM_015443.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3 O:1
• Conservation: PhyloP100: 9.33

Genes affected

KANSL1 (HGNC:24565): (KAT8 regulatory NSL complex subunit 1) This gene encodes a nuclear protein that is a subunit of two protein complexes involved with histone acetylation, the MLL1 complex and the NSL1 complex. The encoded protein has been implicated in a variety of cellular processes including enhancer regulation, cell proliferation, and mitosis. Mutations in this gene are associated with Koolen-de Vries Syndrome. [provided by RefSeq, May 2022]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 17-46171228-G-A is Pathogenic according to our data. Variant chr17-46171228-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 31695.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr17-46171228-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KANSL1	NM_015443.4	c.916C>T	p.Gln306*	stop_gained	2/15	ENST00000432791.7	NP_056258.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KANSL1	ENST00000432791.7	c.916C>T	p.Gln306*	stop_gained	2/15	1	NM_015443.4	ENSP00000387393.3

Frequencies

GnomAD3 genomes Cov.: 35

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 35

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Koolen-de Vries syndrome Pathogenic:2 Other:1

Pathogenic, criteria provided, single submitter	curation	SIB Swiss Institute of Bioinformatics	Jun 05, 2019	This variant is interpreted as a Pathogenic for Koolen-De Vries syndrome, autosomal dominant. The following ACMG Tag(s) were applied: PM2: Absent from controls (or at extremely low frequency if recessive) in Exome Sequencing Project, 1000 Genomes Project, or Exome Aggregation Consortium. PM6: Assumed de novo, but without confirmation of paternity and maternity. PVS1: Predicted nullvariant in a gene where LOF is a known mechanism of disease. -
Pathogenic, no assertion criteria provided	literature only	OMIM	Apr 29, 2012	- -
not provided, no classification provided	literature only	GeneReviews	-	- -

Inborn genetic diseases Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 14, 2023

The c.916C>T (p.Q306*) alteration, located in exon 2 (coding exon 1) of the KANSL1 gene, consists of a C to T substitution at nucleotide position 916. This changes the amino acid from a glutamine (Q) to a stop codon at amino acid position 306. This alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. This variant was not reported in population-based cohorts in the Genome Aggregation Database (gnomAD). This variant has been determined to be the result of a de novo mutation in one individual with features consistent with Koolen-De Vries syndrome (Koolen, 2015). Based on the available evidence, this alteration is classified as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.59
CADD	Pathogenic	38
DANN	Uncertain	1.0
Eigen	Pathogenic	1.2
Eigen_PC	Pathogenic	1.1
FATHMM_MKL	Pathogenic	0.98	D
Vest4		0.38
GERP RS		6.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

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: rs281865468; hg19: chr17-44248594;