rs1555734253

chr17-46039872-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_015443.4(KANSL1):c.2033G>A(p.Ser678Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S678R) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: KANSL1 NM_015443.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.82

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 Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.18529162).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KANSL1	NM_015443.4	c.2033G>A	p.Ser678Asn	missense_variant	8/15	ENST00000432791.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KANSL1	ENST00000432791.7	c.2033G>A	p.Ser678Asn	missense_variant	8/15	1	NM_015443.4	P4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Koolen-de Vries syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Mar 05, 2020

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 (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with KANSL1-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces serine with asparagine at codon 678 of the KANSL1 protein (p.Ser678Asn). The serine residue is highly conserved and there is a small physicochemical difference between serine and asparagine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.22
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.57
Cadd	Benign	23
Dann	Benign	0.80
Eigen	Benign	-0.16
Eigen_PC	Benign	0.019
FATHMM_MKL	Uncertain	0.93	D
M_CAP	Benign	0.0031	T
MetaRNN	Benign	0.19	T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationTaster	Benign	0.99	D;D;D;D;D;D
PrimateAI	Uncertain	0.57	T
PROVEAN	Benign	-0.51	N;.;.;.;.;N;.;.;.;.
REVEL	Benign	0.047
Sift	Benign	0.57	T;.;.;.;.;T;.;.;.;.
Sift4G	Benign	0.55	T;T;T;.;T;T;.;.;.;.
Vest4		0.30
MutPred		0.53		Gain of catalytic residue at S678 (P = 0.045);Gain of catalytic residue at S678 (P = 0.045);Gain of catalytic residue at S678 (P = 0.045);Gain of catalytic residue at S678 (P = 0.045);Gain of catalytic residue at S678 (P = 0.045);Gain of catalytic residue at S678 (P = 0.045);Gain of catalytic residue at S678 (P = 0.045);Gain of catalytic residue at S678 (P = 0.045);.;Gain of catalytic residue at S678 (P = 0.045);
MVP		0.093
MPC		0.49
ClinPred		0.30	T
GERP RS		4.5
gMVP		0.23

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: rs1555734253; hg19: chr17-44117238;