rs267606803

Variant names:

• chr18-57550760-A-T
• rs267606803
• NM_000140.5:c.1224T>A

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_000140.5(FECH):​c.1224T>A​(p.Asn408Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,840 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as no classification for the single variant (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: FECH NM_000140.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.57
• Publications: 2 publications found

Genes affected

FECH (HGNC:3647): (ferrochelatase) The protein encoded by this gene is localized to the mitochondrion, where it catalyzes the insertion of the ferrous form of iron into protoporphyrin IX in the heme synthesis pathway. Mutations in this gene are associated with erythropoietic protoporphyria. Two transcript variants encoding different isoforms have been found for this gene. A pseudogene of this gene is found on chromosome 3.[provided by RefSeq, May 2010]

FECH Gene-Disease associations (from GenCC):

• protoporphyria, erythropoietic, 1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, Laboratory for Molecular Medicine, ClinGen, Labcorp Genetics (formerly Invitae)
• autosomal erythropoietic protoporphyria

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.862

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FECH	NM_000140.5	c.1224T>A	p.Asn408Lys	missense_variant	Exon 11 of 11	ENST00000262093.11	NP_000131.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FECH	ENST00000262093.11	c.1224T>A	p.Asn408Lys	missense_variant	Exon 11 of 11	1	NM_000140.5	ENSP00000262093.6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461840 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727222

African (AFR) AF: 0.00 AC: 0 AN: 33480

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: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53394

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5764

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111990

Other (OTH) AF: 0.00 AC: 0 AN: 60394

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.67
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.030
CADD	Benign	20
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.76	D;.
Eigen	Uncertain	0.28
Eigen_PC	Benign	0.18
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Uncertain	0.96	D;D
M_CAP	Pathogenic	0.79	D
MetaRNN	Pathogenic	0.86	D;D
MetaSVM	Pathogenic	0.89	D
MutationAssessor	Uncertain	2.6	M;.
PhyloP100		1.6
PrimateAI	Uncertain	0.69	T
PROVEAN	Pathogenic	-5.0	D;D
REVEL	Pathogenic	0.67
Sift	Benign	0.060	T;T
Sift4G	Benign	0.090	T;T
Polyphen		1.0	D;D
Vest4		0.82
MutPred		0.49		Gain of methylation at N408 (P = 0.0019);.;
MVP		0.93
MPC		1.3
ClinPred		0.99	D
GERP RS		0.83
Varity_R		0.71
Mutation Taster		=13/87	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: rs267606803; hg19: chr18-55217992;