19-54183590-GC-G

Variant names:

• chr19-54183590-GC-G
• rs886041059
• NM_024298.5:c.423delG

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_024298.5(MBOAT7):​c.423delG​(p.Leu142CysfsTer8) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MBOAT7 NM_024298.5 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: -0.563
• Publications: 2 publications found

Genes affected

MBOAT7 (HGNC:15505): (membrane bound O-acyltransferase domain containing 7) This gene encodes a member of the membrane-bound O-acyltransferases family of integral membrane proteins that have acyltransferase activity. The encoded protein is a lysophosphatidylinositol acyltransferase that has specificity for arachidonoyl-CoA as an acyl donor. This protein is involved in the reacylation of phospholipids as part of the phospholipid remodeling pathway known as the Land cycle. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Mar 2009]

MBOAT7 Gene-Disease associations (from GenCC):

• intellectual disability, autosomal recessive 57

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine
• autosomal recessive non-syndromic intellectual disability

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 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 19-54183590-GC-G is Pathogenic according to our data. Variant chr19-54183590-GC-G is described in ClinVar as Pathogenic. ClinVar VariationId is 268113.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_024298.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MBOAT7	NM_024298.5	MANE Select	c.423delG	p.Leu142CysfsTer8	frameshift	Exon 5 of 8	NP_077274.3
	MBOAT7	NM_001146056.3		c.204delG	p.Leu69CysfsTer8	frameshift	Exon 3 of 6	NP_001139528.1
	MBOAT7	NM_001146083.3		c.204delG	p.Leu69CysfsTer8	frameshift	Exon 4 of 7	NP_001139555.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MBOAT7	ENST00000245615.6	TSL:1 MANE Select	c.423delG	p.Leu142CysfsTer8	frameshift	Exon 5 of 8	ENSP00000245615.1
	MBOAT7	ENST00000431666.6	TSL:1	c.204delG	p.Leu69CysfsTer8	frameshift	Exon 4 of 7	ENSP00000410503.2
	MBOAT7	ENST00000391754.5	TSL:1	c.423delG	p.Leu142CysfsTer8	frameshift	Exon 5 of 7	ENSP00000375634.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Intellectual disability, autosomal recessive 57 Pathogenic:2

Mar 01, 2020

Institute of Human Genetics, University of Leipzig Medical Center

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Review of the variants reported in Reuter et al., 2017, PMID: 28097321: PVS1,PM2,PM3_Supporting

Jan 26, 2022

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

not provided Pathogenic:1

Apr 04, 2025

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Frameshift 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 at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 27616480)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.56
Mutation Taster		=1/199	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs886041059; hg19: chr19-54687473;