NM_014334.4:c.710-4A>C

Variant names:

• chr9-109137631-T-G
• rs372086662
• NM_014334.4:c.710-4A>C

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_014334.4(FRRS1L):​c.710-4A>C variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000205 in 1,533,940 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.00020 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00021 (4 hom.)
• Consequence: FRRS1L NM_014334.4 splice_region, intron
• Scores: Splicing: ADA: 0.0001229
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: -0.0190
• Publications: 0 publications found

Genes affected

FRRS1L (HGNC:1362): (ferric chelate reductase 1 like) This gene encodes a component of the outer-core of an alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor protein in the brain. The encoded protein is thought to interact with inner-core components of the receptor, and play a role in the modulation of glutamate signaling. Mutations in this gene are associated with early infantile epileptic encephalopathy 37. [provided by RefSeq, Jul 2016]

FRRS1L Gene-Disease associations (from GenCC):

• developmental and epileptic encephalopathy, 37

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

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Benign. The variant received -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.71).
• BP6: Variant 9-109137631-T-G is Benign according to our data. Variant chr9-109137631-T-G is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 542877.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.000204 (31/152106) while in subpopulation SAS AF = 0.00623 (30/4812). AF 95% confidence interval is 0.00449. There are 0 homozygotes in GnomAd4. There are 18 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High Homozygotes in GnomAdExome4 at 4 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FRRS1L	NM_014334.4	c.710-4A>C		splice_region_variant, intron_variant	Intron 4 of 4	ENST00000561981.5	NP_055149.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FRRS1L	ENST00000561981.5	c.710-4A>C		splice_region_variant, intron_variant	Intron 4 of 4	1	NM_014334.4	ENSP00000477141.2
FRRS1L	ENST00000644736.1	n.*682-4A>C		splice_region_variant, intron_variant	Intron 5 of 5			ENSP00000494579.1
FRRS1L	ENST00000644747.1	n.*328-4A>C		splice_region_variant, intron_variant	Intron 3 of 3			ENSP00000493964.1
FRRS1L	ENST00000645180.1	n.*26A>C		downstream_gene_variant

Frequencies

GnomAD3 genomes AF: 0.000211 AC: 32 AN: 151988 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00644

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.000495 AC: 109 AN: 220422 AF XY: 0.000664

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.000197

GnomAD4 exome AF: 0.000206 AC: 284 AN: 1381834 Hom.: 4 Cov.: 27 AF XY: 0.000307 AC XY: 210 AN XY: 684688

African (AFR) AF: 0.00 AC: 0 AN: 31020

American (AMR) AF: 0.00 AC: 0 AN: 35946

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 23466

East Asian (EAS) AF: 0.00 AC: 0 AN: 38686

South Asian (SAS) AF: 0.00379 AC: 274 AN: 72224

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50498

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5396

European-Non Finnish (NFE) AF: 9.36e-7 AC: 1 AN: 1068162

Other (OTH) AF: 0.000159 AC: 9 AN: 56436

GnomAD4 genome AF: 0.000204 AC: 31 AN: 152106 Hom.: 0 Cov.: 32 AF XY: 0.000242 AC XY: 18 AN XY: 74368

African (AFR) AF: 0.00 AC: 0 AN: 41494

American (AMR) AF: 0.00 AC: 0 AN: 15276

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5172

South Asian (SAS) AF: 0.00623 AC: 30 AN: 4812

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10576

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 67990

Other (OTH) AF: 0.00 AC: 0 AN: 2112

Alfa AF: 0.000128 Hom.: 0

Bravo AF: 0.0000340

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:1

Sep 09, 2020

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Developmental and epileptic encephalopathy, 37 Benign:1

Jan 30, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.71
CADD	Benign	5.6
DANN	Benign	0.70
PhyloP100		-0.019
Mutation Taster		=100/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.00012
dbscSNV1_RF	Benign	0.0
SpliceAI score (max)		0.050		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: rs372086662; hg19: chr9-111899911;