NM_015166.4:c.448delC

Variant names:

• chr22-50077477-AG-A
• rs1555967227
• NM_015166.4:c.448delC

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PVS1 PM2 PP5

The NM_015166.4(MLC1):​c.448delC​(p.Leu150SerfsTer11) 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 (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MLC1 NM_015166.4 frameshift
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 2.87
• Publications: 1 publications found

Genes affected

MLC1 (HGNC:17082): (modulator of VRAC current 1) The function of this gene product is unknown; however, homology to other proteins suggests that it may be an integral membrane transporter. Mutations in this gene have been associated with megalencephalic leukoencephalopathy with subcortical cysts, an autosomal recessive neurological disorder. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Jul 2008]

MLC1 Gene-Disease associations (from GenCC):

• megalencephalic leukoencephalopathy with subcortical cysts 1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Myriad Women’s Health, G2P, Ambry Genetics
• megalencephalic leukoencephalopathy with subcortical cysts

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 11 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 22-50077477-AG-A is Pathogenic according to our data. Variant chr22-50077477-AG-A is described in ClinVar as Pathogenic. ClinVar VariationId is 556409.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_015166.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MLC1	NM_015166.4	MANE Select	c.448delC	p.Leu150SerfsTer11	frameshift	Exon 6 of 12	NP_055981.1	Q15049-1
	MLC1	NM_001376472.1		c.448delC	p.Leu150SerfsTer11	frameshift	Exon 5 of 11	NP_001363401.1	Q15049-1
	MLC1	NM_001376473.1		c.448delC	p.Leu150SerfsTer11	frameshift	Exon 7 of 13	NP_001363402.1	Q15049-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MLC1	ENST00000311597.10	TSL:1 MANE Select	c.448delC	p.Leu150SerfsTer11	frameshift	Exon 6 of 12	ENSP00000310375.6	Q15049-1
	MLC1	ENST00000395876.6	TSL:1	c.448delC	p.Leu150SerfsTer11	frameshift	Exon 6 of 12	ENSP00000379216.2	Q15049-1
	MLC1	ENST00000879262.1		c.448delC	p.Leu150SerfsTer11	frameshift	Exon 7 of 13	ENSP00000549321.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Megalencephalic leukoencephalopathy with subcortical cysts 1 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		2.9
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: rs1555967227; hg19: chr22-50515906;