NM_013402.7:c.11G>A

Variant names:

• chr11-61816919-C-T
• rs2066991209
• NM_013402.7:c.11G>A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_013402.7(FADS1):​c.11G>A​(p.Arg4His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000016 in 1,247,492 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000016 (0 hom.)
• Consequence: FADS1 NM_013402.7 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.445

Genes affected

FADS1 (HGNC:3574): (fatty acid desaturase 1) The protein encoded by this gene is a member of the fatty acid desaturase (FADS) gene family. Desaturase enzymes regulate unsaturation of fatty acids through the introduction of double bonds between defined carbons of the fatty acyl chain. FADS family members are considered fusion products composed of an N-terminal cytochrome b5-like domain and a C-terminal multiple membrane-spanning desaturase portion, both of which are characterized by conserved histidine motifs. This gene is clustered with family members FADS1 and FADS2 at 11q12-q13.1; this cluster is thought to have arisen evolutionarily from gene duplication based on its similar exon/intron organization. [provided by RefSeq, Jul 2008]

FADS2 (HGNC:3575): (fatty acid desaturase 2) The protein encoded by this gene is a member of the fatty acid desaturase (FADS) gene family. Desaturase enzymes regulate unsaturation of fatty acids through the introduction of double bonds between defined carbons of the fatty acyl chain. FADS family members are considered fusion products composed of an N-terminal cytochrome b5-like domain and a C-terminal multiple membrane-spanning desaturase portion, both of which are characterized by conserved histidine motifs. This gene is clustered with family members at 11q12-q13.1; this cluster is thought to have arisen evolutionarily from gene duplication based on its similar exon/intron organization. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Jul 2013]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.28820783).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FADS1	NM_013402.7	c.11G>A	p.Arg4His	missense_variant	Exon 1 of 12	ENST00000350997.12	NP_037534.5
FADS2	NM_001281501.1	c.141+493C>T		intron_variant	Intron 1 of 11		NP_001268430.1
FADS2	NM_001281502.1	c.114+223C>T		intron_variant	Intron 1 of 11		NP_001268431.1
FADS2	XM_047427889.1	c.-2360+493C>T		intron_variant	Intron 1 of 12		XP_047283845.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FADS1	ENST00000350997.12	c.11G>A	p.Arg4His	missense_variant	Exon 1 of 12	1	NM_013402.7	ENSP00000322229.9

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000160 AC: 2 AN: 1247492 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 607930

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000196

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Jan 31, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.11G>A (p.R4H) alteration is located in exon 1 (coding exon 1) of the FADS1 gene. This alteration results from a G to A substitution at nucleotide position 11, causing the arginine (R) at amino acid position 4 to be replaced by a histidine (H). 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
BayesDel_addAF	Uncertain	0.021	T
BayesDel_noAF	Benign	-0.21
CADD	Benign	21
DANN	Pathogenic	1.0
Eigen	Benign	-0.22
Eigen_PC	Benign	-0.30
FATHMM_MKL	Benign	0.093	N
LIST_S2	Benign	0.51	T
M_CAP	Pathogenic	0.65	D
MetaRNN	Benign	0.29	T
MetaSVM	Benign	-0.60	T
PrimateAI	Pathogenic	0.82	D
PROVEAN	Benign	-0.20	N
REVEL	Benign	0.062
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Vest4		0.092
MutPred		0.32		Loss of MoRF binding (P = 6e-04);
MVP		0.51
MPC		2.5
ClinPred		0.93	D
GERP RS		2.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.9
gMVP		0.30

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

Publications

LitVar

Other links and lift over

dbSNP: rs2066991209; hg19: chr11-61584391;