rs80358242

Variant names:

• chr22-50084727-C-G
• rs80358242
• NM_015166.4:c.176G>C

Your query was ambiguous. Multiple possible variants found:

• chr22-50084727-C-G
• chr22-50084727-C-T

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM2 PM5 PP3

The NM_015166.4(MLC1):​c.176G>C​(p.Gly59Ala) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.000000684 in 1,461,604 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G59E) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: MLC1 NM_015166.4 missense, splice_region
• Scores: Splicing: ADA: 0.9880
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.89
• Publications: 0 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), Ambry Genetics, G2P, Myriad Women’s Health
• megalencephalic leukoencephalopathy with subcortical cysts

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr22-50084727-C-T is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 4721.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MLC1	NM_015166.4	MANE Select	c.176G>C	p.Gly59Ala	missense splice_region	Exon 2 of 12	NP_055981.1
	MLC1	NM_001376472.1		c.176G>C	p.Gly59Ala	missense splice_region	Exon 1 of 11	NP_001363401.1
	MLC1	NM_001376473.1		c.176G>C	p.Gly59Ala	missense splice_region	Exon 3 of 13	NP_001363402.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MLC1	ENST00000311597.10	TSL:1 MANE Select	c.176G>C	p.Gly59Ala	missense splice_region	Exon 2 of 12	ENSP00000310375.6
	MLC1	ENST00000395876.6	TSL:1	c.176G>C	p.Gly59Ala	missense splice_region	Exon 2 of 12	ENSP00000379216.2
	MLC1	ENST00000442311.1	TSL:5	c.176G>C	p.Gly59Ala	missense splice_region	Exon 2 of 8	ENSP00000401385.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461604 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727106

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33476

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86248

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53330

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5656

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111958

Other (OTH) AF: 0.00 AC: 0 AN: 60376

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.65
BayesDel_addAF	Pathogenic	0.46	D
BayesDel_noAF	Pathogenic	0.42
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.55	D
Eigen	Pathogenic	0.80
Eigen_PC	Pathogenic	0.78
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.90	D
M_CAP	Uncertain	0.19	D
MetaRNN	Pathogenic	0.98	D
MetaSVM	Pathogenic	0.87	D
MutationAssessor	Uncertain	2.3	M
PhyloP100		6.9
PrimateAI	Uncertain	0.66	T
PROVEAN	Pathogenic	-6.0	D
REVEL	Pathogenic	0.90
Sift	Pathogenic	0.0	D
Sift4G	Benign	0.085	T
Polyphen		1.0	D
Vest4		0.94
MutPred		0.90		Loss of sheet (P = 0.0054)
MVP		0.92
MPC		0.70
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.93
gMVP		0.80
Mutation Taster		=5/95	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	0.99
dbscSNV1_RF	Pathogenic	0.93
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: rs80358242; hg19: chr22-50523156;