21-36759829-G-C

Variant names:

• chr21-36759829-G-C
• NM_001352514.2:c.2134C>G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_001352514.2(HLCS):​c.2134C>G​(p.Arg712Gly) variant causes a missense change. The variant allele was found at a frequency of 0.000000687 in 1,455,030 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: HLCS NM_001352514.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.28

Genes affected

HLCS (HGNC:4976): (holocarboxylase synthetase) This gene encodes an enzyme that catalyzes the binding of biotin to carboxylases and histones. The protein plays an important role in gluconeogenesis, fatty acid synthesis and branched chain amino acid catabolism. Defects in this gene are the cause of holocarboxylase synthetase deficiency. Multiple alternatively spliced variants, encoding the same protein, have been identified.[provided by RefSeq, Jun 2011]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.896

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HLCS	NM_001352514.2	c.2134C>G	p.Arg712Gly	missense_variant	Exon 9 of 11	ENST00000674895.3	NP_001339443.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HLCS	ENST00000674895.3	c.2134C>G	p.Arg712Gly	missense_variant	Exon 9 of 11		NM_001352514.2	ENSP00000502087.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.87e-7 AC: 1 AN: 1455030 Hom.: 0 Cov.: 28 AF XY: 0.00000138 AC XY: 1 AN XY: 724318

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: 9.04e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.51
BayesDel_addAF	Pathogenic	0.45	D
BayesDel_noAF	Pathogenic	0.40
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.83	D;D;D
Eigen	Uncertain	0.30
Eigen_PC	Uncertain	0.29
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Uncertain	0.90	D;.;.
M_CAP	Pathogenic	0.30	D
MetaRNN	Pathogenic	0.90	D;D;D
MetaSVM	Uncertain	0.68	D
MutationAssessor	Benign	1.3	L;L;L
PrimateAI	Uncertain	0.76	T
PROVEAN	Uncertain	-4.1	.;D;D
REVEL	Pathogenic	0.84
Sift	Pathogenic	0.0	.;D;D
Sift4G	Benign	0.092	T;T;T
Polyphen		0.99	D;D;D
Vest4		0.93
MutPred		0.60		Loss of stability (P = 0.0311);Loss of stability (P = 0.0311);Loss of stability (P = 0.0311);
MVP		0.93
MPC		0.66
ClinPred		0.99	D
GERP RS		3.5
Varity_R		0.84
gMVP		0.91

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr21-38132130;