21-36765020-C-T

Variant names:

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_001352514.2(HLCS):c.2113G>A(p.Glu705Lys) variant causes a missense change. The variant allele was found at a frequency of 0.00187 in 1,614,196 control chromosomes in the GnomAD database, including 15 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0030 ( 2 hom., cov: 33)

Exomes 𝑓: 0.0017 ( 13 hom. )

Consequence

HLCS
NM_001352514.2 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:11

Conservation

PhyloP100: 4.28

Variant links:

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]

HLCS links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0096511245).

BP6

Variant 21-36765020-C-T is Benign according to our data. Variant chr21-36765020-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 203754.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr21-36765020-C-T is described in Lovd as [Likely_benign].

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00304 (463/152316) while in subpopulation AFR AF= 0.00519 (216/41582). AF 95% confidence interval is 0.00463. There are 2 homozygotes in gnomad4. There are 219 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HLCS	NM_001352514.2 link	c.2113G>A	p.Glu705Lys	missense_variant	Exon 8 of 11	ENST00000674895.3	NP_001339443.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HLCS	ENST00000674895.3 link	c.2113G>A	p.Glu705Lys	missense_variant	Exon 8 of 11		NM_001352514.2	ENSP00000502087.2		P50747-2A0A8C8QSB1

Frequencies

GnomAD3 genomes

AF:

0.00304

AC:

463

AN:

152198

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00521

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00445

Gnomad ASJ

AF:

0.0251

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0000943

Gnomad MID

AF:

0.00949

Gnomad NFE

AF:

0.00122

Gnomad OTH

AF:

0.00239

GnomAD3 exomes

AF:

0.00275

AC:

691

AN:

251480

Hom.:

AF XY:

0.00252

AC XY:

343

AN XY:

135916

show subpopulations

Gnomad AFR exome

AF:

0.00504

Gnomad AMR exome

AF:

0.00451

Gnomad ASJ exome

AF:

0.0243

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000653

Gnomad FIN exome

AF:

0.0000924

Gnomad NFE exome

AF:

0.00148

Gnomad OTH exome

AF:

0.00586

GnomAD4 exome

AF:

0.00175

AC:

2555

AN:

1461880

Hom.:

Cov.:

AF XY:

0.00172

AC XY:

1251

AN XY:

727244

show subpopulations

Gnomad4 AFR exome

AF:

0.00565

Gnomad4 AMR exome

AF:

0.00483

Gnomad4 ASJ exome

AF:

0.0266

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000696

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.00100

Gnomad4 OTH exome

AF:

0.00431

GnomAD4 genome

AF:

0.00304

AC:

463

AN:

152316

Hom.:

Cov.:

AF XY:

0.00294

AC XY:

219

AN XY:

74466

show subpopulations

Gnomad4 AFR

AF:

0.00519

Gnomad4 AMR

AF:

0.00444

Gnomad4 ASJ

AF:

0.0251

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.0000943

Gnomad4 NFE

AF:

0.00122

Gnomad4 OTH

AF:

0.00237

Alfa

AF:

0.00255

Hom.:

Bravo

AF:

0.00387

TwinsUK

AF:

0.000809

AC:

ALSPAC

AF:

0.000778

AC:

ESP6500AA

AF:

0.00431

AC:

ESP6500EA

AF:

0.00209

AC:

ExAC

AF:

0.00237

AC:

288

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.00158

EpiControl

AF:

0.00213

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:11

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Holocarboxylase synthetase deficiency

Benign:4

May 02, 2016

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 23, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Dec 04, 2019

Natera, Inc.

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

not provided

Benign:4

Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Mar 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

HLCS: BS2 -

Clinical Genetics, Academic Medical Center

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Breakthrough Genomics, Breakthrough Genomics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

not specified

Benign:2

Mar 05, 2018

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Mar 28, 2016

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant identified in a genome or exome case(s) and assessed due to predicted null impact of the variant or pathogenic assertions in the literature or databases. Disclaimer: This variant has not undergone full assessment. The following are preliminary notes: Gene assocaited with multiple carboxylase deficiency/ holocarboxylase synthetase deficiency - Affected infants often have difficulty feeding, breathing problems, a skin rash, hair loss (alopecia), and a lack of energy (lethargy).2 homo Europeans. Frequency of this variant is too high for the disorder ( estimated to affect 1 in 87,000 people) -

Inborn genetic diseases

Benign:1

Apr 03, 2021

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.078

BayesDel_addAF

Benign

-0.31

BayesDel_noAF

Benign

-0.22

CADD

Benign

DANN

Benign

0.95

DEOGEN2

Uncertain

0.43

T;T;T

Eigen

Benign

-1.0

Eigen_PC

Benign

-1.0

FATHMM_MKL

Benign

0.39

LIST_S2

Benign

0.76

T;.;.

M_CAP

Uncertain

0.11

MetaRNN

Benign

0.0097

T;T;T

MetaSVM

Benign

-0.43

MutationAssessor

Benign

0.15

N;N;N

PrimateAI

Benign

0.33

PROVEAN

Benign

-0.30

.;N;N

REVEL

Uncertain

0.31

Sift

Benign

0.12

.;T;T

Sift4G

Benign

0.17

T;T;T

Polyphen

0.21

B;B;B

Vest4

0.26

MVP

0.76

MPC

0.31

ClinPred

0.014

GERP RS

1.8

Varity_R

0.044

gMVP

0.69

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over