NM_020873.7:c.491C>G

Variant names:

• chr3-3845132-C-G
• NM_020873.7:c.491C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_020873.7(LRRN1):​c.491C>G​(p.Ala164Gly) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A164S) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: LRRN1 NM_020873.7 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.05
• Publications: 0 publications found

Genes affected

LRRN1 (HGNC:20980): (leucine rich repeat neuronal 1) Predicted to act upstream of or within positive regulation of synapse assembly. Predicted to be integral component of membrane. Predicted to be active in extracellular matrix and extracellular space. [provided by Alliance of Genome Resources, Apr 2022]

SUMF1 (HGNC:20376): (sulfatase modifying factor 1) This gene encodes an enzyme that catalyzes the hydrolysis of sulfate esters by oxidizing a cysteine residue in the substrate sulfatase to an active site 3-oxoalanine residue, which is also known as C-alpha-formylglycine. Mutations in this gene cause multiple sulfatase deficiency, a lysosomal storage disorder. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2009]

SUMF1 Gene-Disease associations (from GenCC):

• mucosulfatidosis

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: PanelApp Australia, Orphanet, Labcorp Genetics (formerly Invitae), Genomics England PanelApp, ClinGen, G2P

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.23576444).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LRRN1	NM_020873.7	c.491C>G	p.Ala164Gly	missense_variant	Exon 2 of 2	ENST00000319331.4	NP_065924.3
LRRN1	NM_001324188.2	c.491C>G	p.Ala164Gly	missense_variant	Exon 3 of 3		NP_001311117.1
LRRN1	NM_001324189.2	c.491C>G	p.Ala164Gly	missense_variant	Exon 3 of 3		NP_001311118.1
LRRN1	XM_047448644.1	c.491C>G	p.Ala164Gly	missense_variant	Exon 2 of 2		XP_047304600.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LRRN1	ENST00000319331.4	c.491C>G	p.Ala164Gly	missense_variant	Exon 2 of 2	1	NM_020873.7	ENSP00000314901.3
SUMF1	ENST00000448413.5	n.1192-17623G>C		intron_variant	Intron 9 of 12	2		ENSP00000404384.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 76

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Jul 25, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.491C>G (p.A164G) alteration is located in exon 2 (coding exon 1) of the LRRN1 gene. This alteration results from a C to G substitution at nucleotide position 491, causing the alanine (A) at amino acid position 164 to be replaced by a glycine (G). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.49
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Benign	0.055	T
Eigen	Benign	0.0079
Eigen_PC	Uncertain	0.24
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.85	D
M_CAP	Benign	0.0042	T
MetaRNN	Benign	0.24	T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	0.52	N
PhyloP100		6.0
PrimateAI	Benign	0.40	T
PROVEAN	Benign	-1.7	N
REVEL	Benign	0.064
Sift	Benign	0.28	T
Sift4G	Benign	0.31	T
Polyphen		0.0	B
Vest4		0.14
MutPred		0.25		Gain of helix (P = 0.132);
MVP		0.17
MPC		0.19
ClinPred		0.80	D
GERP RS		5.8
Varity_R		0.15
gMVP		0.22
Mutation Taster		=68/32	polymorphism

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

hg19: chr3-3886816;