6-131583862-G-T

Variant names:

• chr6-131583862-G-T
• rs377280518
• NM_000045.4:c.923G>T

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PM5 PP3_Moderate

The NM_000045.4(ARG1):​c.923G>T​(p.Arg308Leu) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 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. R308W) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ARG1 NM_000045.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.08
• Publications: 0 publications found

Genes affected

ARG1 (HGNC:663): (arginase 1) Arginase catalyzes the hydrolysis of arginine to ornithine and urea. At least two isoforms of mammalian arginase exist (types I and II) which differ in their tissue distribution, subcellular localization, immunologic crossreactivity and physiologic function. The type I isoform encoded by this gene, is a cytosolic enzyme and expressed predominantly in the liver as a component of the urea cycle. Inherited deficiency of this enzyme results in argininemia, an autosomal recessive disorder characterized by hyperammonemia. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Sep 2011]

MED23 (HGNC:2372): (mediator complex subunit 23) The activation of gene transcription is a multistep process that is triggered by factors that recognize transcriptional enhancer sites in DNA. These factors work with co-activators to direct transcriptional initiation by the RNA polymerase II apparatus. The protein encoded by this gene is a subunit of the CRSP (cofactor required for SP1 activation) complex, which, along with TFIID, is required for efficient activation by SP1. This protein is also a component of other multisubunit complexes e.g. thyroid hormone receptor-(TR-) associated proteins which interact with TR and facilitate TR function on DNA templates in conjunction with initiation factors and cofactors. This protein also acts as a metastasis suppressor. Several alternatively spliced transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq, Jul 2012]

MED23 Gene-Disease associations (from GenCC):

• intellectual disability, autosomal recessive 18

  Inheritance: AR Classification: STRONG, MODERATE, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P
• syndromic intellectual disability

  Inheritance: AR Classification: MODERATE Submitted by: ClinGen
• autosomal recessive non-syndromic intellectual disability

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr6-131583861-C-T is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 1012110.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.85

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000045.4. 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
	ARG1	NM_000045.4	MANE Select	c.923G>T	p.Arg308Leu	missense	Exon 8 of 8	NP_000036.2
	ARG1	NM_001244438.2		c.947G>T	p.Arg316Leu	missense	Exon 8 of 8	NP_001231367.1
	ARG1	NM_001369020.1		c.668G>T	p.Arg223Leu	missense	Exon 6 of 6	NP_001355949.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ARG1	ENST00000368087.8	TSL:1 MANE Select	c.923G>T	p.Arg308Leu	missense	Exon 8 of 8	ENSP00000357066.3
	ARG1	ENST00000356962.2	TSL:1	c.947G>T	p.Arg316Leu	missense	Exon 8 of 8	ENSP00000349446.2
	MED23	ENST00000354577.8	TSL:1	c.4095+3847C>A		intron	N/A	ENSP00000346588.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.92
BayesDel_addAF	Pathogenic	0.50	D
BayesDel_noAF	Pathogenic	0.48
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.68	D
Eigen	Pathogenic	0.73
Eigen_PC	Pathogenic	0.77
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.95	D
M_CAP	Pathogenic	0.29	D
MetaRNN	Pathogenic	0.85	D
MetaSVM	Pathogenic	0.93	D
MutationAssessor	Uncertain	2.7	M
PhyloP100		6.1
PrimateAI	Benign	0.45	T
PROVEAN	Uncertain	-3.4	D
REVEL	Pathogenic	0.82
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0030	D
Polyphen		1.0	D
Vest4		0.46
MutPred		0.64		Loss of methylation at K313 (P = 0.032)
MVP		1.0
MPC		0.42
ClinPred		1.0	D
GERP RS		6.0
Varity_R		0.93
gMVP		0.82
Mutation Taster		=28/72	disease causing

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: rs377280518; hg19: chr6-131905002;