rs1555907620

Positions:

• chrX-11772246-C-T

Variant summary

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

The NM_078629.4(MSL3):​c.1372C>T​(p.Arg458Ter) variant causes a stop gained change involving the alteration of a non-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 Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 23)
• Consequence: MSL3 NM_078629.4 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 1.64

Genes affected

MSL3 (HGNC:7370): (MSL complex subunit 3) This gene encodes a nuclear protein that is similar to the product of the Drosophila male-specific lethal-3 gene. The Drosophila protein plays a critical role in a dosage-compensation pathway, which equalizes X-linked gene expression in males and females. Thus, the human protein is thought to play a similar function in chromatin remodeling and transcriptional regulation, and it has been found as part of a complex that is responsible for histone H4 lysine-16 acetylation. This gene can undergo X inactivation. Alternative splicing results in multiple transcript variants. Related pseudogenes have been identified on chromosomes 2, 7 and 8. [provided by RefSeq, Jul 2010]

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 X-11772246-C-T is Pathogenic according to our data. Variant chrX-11772246-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 487568.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MSL3	NM_078629.4	c.1372C>T	p.Arg458Ter	stop_gained	11/13	ENST00000312196.10	NP_523353.2
MSL3	NM_001193270.2	c.1336C>T	p.Arg446Ter	stop_gained	11/13		NP_001180199.1
MSL3	NM_001282174.1	c.925C>T	p.Arg309Ter	stop_gained	10/12		NP_001269103.1
MSL3	NM_006800.4	c.874C>T	p.Arg292Ter	stop_gained	10/12		NP_006791.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MSL3	ENST00000312196.10	c.1372C>T	p.Arg458Ter	stop_gained	11/13	1	NM_078629.4	ENSP00000312244	P4

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 27

GnomAD4 genome Cov.: 23

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Feb 22, 2023

Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; Not observed in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 33173220, 30224647) -

Basilicata-Akhtar syndrome Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Aug 05, 2022

- -

Intellectual disability Pathogenic:1

Likely pathogenic, criteria provided, single submitter

research

Equipe Genetique des Anomalies du Developpement, Université de Bourgogne

Jan 01, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.56	D
BayesDel_noAF	Pathogenic	0.57
CADD	Pathogenic	34
DANN	Uncertain	0.99
FATHMM_MKL	Uncertain	0.89	D
MutationTaster	Benign	1.0	A;A;A;A
Vest4		0.94
GERP RS		1.3

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: rs1555907620; hg19: chrX-11790365;