chr17-46032081-C-T

Position:

• chr17-46032081-C-T

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4 BP6 BS2

The ENST00000432791.7(KANSL1):​c.3056G>A​(p.Arg1019His) variant causes a missense change. The variant allele was found at a frequency of 0.0000144 in 1,461,872 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. R1019R) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000014 (0 hom.)
• Consequence: KANSL1 ENST00000432791.7 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:1
• Conservation: PhyloP100: 5.49

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 Likely_benign. Variant got -6 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.27001306).
• BP6: Variant 17-46032081-C-T is Benign according to our data. Variant chr17-46032081-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 205800.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=2, Likely_benign=1}.
• BS2: High AC in GnomAdExome4 at 21 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KANSL1	NM_015443.4	c.3056G>A	p.Arg1019His	missense_variant	14/15	ENST00000432791.7	NP_056258.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KANSL1	ENST00000432791.7	c.3056G>A	p.Arg1019His	missense_variant	14/15	1	NM_015443.4	ENSP00000387393	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000358 AC: 9 AN: 251334 Hom.: 0 AF XY: 0.0000221 AC XY: 3 AN XY: 135850

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000174

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000264

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000144 AC: 21 AN: 1461872 Hom.: 0 Cov.: 30 AF XY: 0.0000110 AC XY: 8 AN XY: 727240

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.000134

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000232

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000989

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

Bravo AF: 0.0000113

ExAC AF: 0.0000494 AC: 6

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Koolen-de Vries syndrome Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jun 14, 2022	This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 1019 of the KANSL1 protein (p.Arg1019His). This variant is present in population databases (rs781056926, gnomAD 0.02%). This missense change has been observed in individual(s) with neurodevelopmental disorders (PMID: 33004838). ClinVar contains an entry for this variant (Variation ID: 205800). 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: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Oct 31, 2018	- -

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Mar 03, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Benign	-0.25	T
BayesDel_noAF	Benign	-0.33
CADD	Pathogenic	32
DANN	Pathogenic	1.0
Eigen	Uncertain	0.60
Eigen_PC	Uncertain	0.65
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.92	.;.;.;.;D;D;D
M_CAP	Benign	0.041	D
MetaRNN	Benign	0.27	T;T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationTaster	Benign	0.99	D;D;D;D;D;D
PrimateAI	Uncertain	0.71	T
PROVEAN	Benign	-1.4	N;.;.;.;.;N;.
REVEL	Benign	0.18
Sift	Uncertain	0.027	D;.;.;.;.;D;.
Sift4G	Benign	0.11	.;T;.;.;T;T;.
Vest4		0.44, 0.43, 0.44
MutPred		0.22		Loss of phosphorylation at S1021 (P = 0.0691);Loss of phosphorylation at S1021 (P = 0.0691);.;.;.;Loss of phosphorylation at S1021 (P = 0.0691);.;
MVP		0.28
MPC		1.4
ClinPred		0.66	D
GERP RS		5.7
gMVP		0.33

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: rs781056926; hg19: chr17-44109447;