NM_000190.4:c.242T>C

Variant names:

• chr11-119089248-T-C
• rs118204119
• NM_000190.4:c.242T>C

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2 PP3_Strong PP5

The NM_000190.4(HMBS):​c.242T>C​(p.Leu81Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 12/20 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: HMBS NM_000190.4 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 7.45

Genes affected

HMBS (HGNC:4982): (hydroxymethylbilane synthase) This gene encodes a member of the hydroxymethylbilane synthase superfamily. The encoded protein is the third enzyme of the heme biosynthetic pathway and catalyzes the head to tail condensation of four porphobilinogen molecules into the linear hydroxymethylbilane. Mutations in this gene are associated with the autosomal dominant disease acute intermittent porphyria. Alternatively spliced transcript variants encoding different isoforms have been described. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.993
• PP5: Variant 11-119089248-T-C is Pathogenic according to our data. Variant chr11-119089248-T-C is described in ClinVar as [Pathogenic]. Clinvar id is 1485.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HMBS	NM_000190.4	c.242T>C	p.Leu81Pro	missense_variant	Exon 5 of 14	ENST00000652429.1	NP_000181.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HMBS	ENST00000652429.1	c.242T>C	p.Leu81Pro	missense_variant	Exon 5 of 14		NM_000190.4	ENSP00000498786.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Encephalopathy, porphyria-related Pathogenic:1

Jan 01, 2004

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.60
CADD	Pathogenic	31
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.99	.;D;.;.;D;.;.;D;.;.;.;.;.
Eigen	Pathogenic	0.94
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Uncertain	0.96	D
M_CAP	Pathogenic	0.87	D
MetaRNN	Pathogenic	0.99	D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	0.93	D
MutationAssessor	Pathogenic	4.2	.;H;.;.;.;.;H;.;.;.;.;.;.
PrimateAI	Pathogenic	0.86	D
PROVEAN	Pathogenic	-5.2	D;D;D;D;D;.;D;D;.;D;D;D;.
REVEL	Pathogenic	0.98
Sift	Uncertain	0.0030	D;D;D;D;D;.;D;D;.;D;D;D;.
Sift4G	Pathogenic	0.0	.;D;D;D;D;.;D;D;.;D;D;D;.
Polyphen		1.0	.;D;D;.;.;.;.;D;.;D;.;D;D
Vest4		0.96, 0.98, 0.96, 0.97, 0.95, 0.98
MutPred		0.97		.;Gain of disorder (P = 0.0292);.;.;Gain of disorder (P = 0.0292);.;Gain of disorder (P = 0.0292);.;.;.;.;.;.;
MVP		0.99
MPC		1.5
ClinPred		1.0	D
GERP RS		4.8
RBP_binding_hub_radar		0.97
RBP_regulation_power_radar		2.1
Varity_R		0.99

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: rs118204119; hg19: chr11-118959958;