Genetic Variant RPL21:c.394-11dupT (chr13-27256416-C-CT) – ACMG Classification: Likely_benign (-6 pts)

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP6_ModerateBS2

The NM_000982.4(RPL21):c.394-11dupT variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00109 in 1,546,062 control chromosomes in the GnomAD database, including 1 homozygotes. Variant has been reported in ClinVar as Likely benign (★).

Frequency

Genomes: 𝑓 0.00059 ( 1 hom., cov: 32)

Exomes 𝑓: 0.0011 ( 0 hom. )

Consequence

RPL21
NM_000982.4 intron

Scores

Not classified

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: 1.21

Publications

0 publications found

Variant links:

Genes affected

RPL21 (HGNC:10313): (ribosomal protein L21) Ribosomes, the organelles that catalyze protein synthesis, consist of a small 40S subunit and a large 60S subunit. Together these subunits are composed of 4 RNA species and approximately 80 structurally distinct proteins. This gene encodes a ribosomal protein that is a component of the 60S subunit. The protein belongs to the L21E family of ribosomal proteins. It is located in the cytoplasm. As is typical for genes encoding ribosomal proteins, there are multiple processed pseudogenes of this gene dispersed through the genome. [provided by RefSeq, Jul 2008]

RPL21 Gene-Disease associations (from GenCC):

hypotrichosis 12
Inheritance: AD Classification: STRONG, LIMITED Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
hypotrichosis simplex
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

RPL21 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -6 ACMG points.

BP6

Variant 13-27256416-C-CT is Benign according to our data. Variant chr13-27256416-C-CT is described in ClinVar as [Likely_benign]. Clinvar id is 1988640.Status of the report is criteria_provided_single_submitter, 1 stars.

BS2

High AC in GnomAd4 at 89 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RPL21	NM_000982.4 link	c.394-11dupT		intron_variant	Intron 5 of 5	ENST00000311549.11	NP_000973.2	P46778Q6IAX2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RPL21	ENST00000311549.11 link	c.394-20_394-19insT		intron_variant	Intron 5 of 5	1	NM_000982.4	ENSP00000346027.4		P46778

Frequencies

GnomAD3 genomes

AF:

0.000589

AC:

AN:

151222

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000267

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00204

Gnomad ASJ

AF:

0.00289

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000628

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00949

Gnomad NFE

AF:

0.000354

Gnomad OTH

AF:

0.00338

GnomAD2 exomes

AF:

0.000996

AC:

220

AN:

220924

AF XY:

0.000972

show subpopulations

Gnomad AFR exome

AF:

0.000439

Gnomad AMR exome

AF:

0.00155

Gnomad ASJ exome

AF:

0.00294

Gnomad EAS exome

AF:

0.000247

Gnomad FIN exome

AF:

0.0000508

Gnomad NFE exome

AF:

0.00105

Gnomad OTH exome

AF:

0.00217

GnomAD4 exome

AF:

0.00114

AC:

1592

AN:

1394724

Hom.:

Cov.:

AF XY:

0.00112

AC XY:

783

AN XY:

697172

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.000688

AC:

AN:

31976

American (AMR)

AF:

0.00120

AC:

AN:

44248

Ashkenazi Jewish (ASJ)

AF:

0.00278

AC:

AN:

25574

East Asian (EAS)

AF:

0.000282

AC:

AN:

38968

South Asian (SAS)

AF:

0.000840

AC:

AN:

84534

European-Finnish (FIN)

AF:

0.000114

AC:

AN:

52842

Middle Eastern (MID)

AF:

0.0110

AC:

AN:

5648

European-Non Finnish (NFE)

AF:

0.00113

AC:

1189

AN:

1052924

Other (OTH)

AF:

0.00184

AC:

107

AN:

58010

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.338

Heterozygous variant carriers

150

300

451

601

751

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.000588

AC:

AN:

151338

Hom.:

Cov.:

AF XY:

0.000528

AC XY:

AN XY:

73920

show subpopulations

African (AFR)

AF:

0.000267

AC:

AN:

41258

American (AMR)

AF:

0.00204

AC:

AN:

15188

Ashkenazi Jewish (ASJ)

AF:

0.00289

AC:

AN:

3464

East Asian (EAS)

AF:

0.00

AC:

AN:

5162

South Asian (SAS)

AF:

0.000629

AC:

AN:

4770

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10412

Middle Eastern (MID)

AF:

0.0102

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000354

AC:

AN:

67786

Other (OTH)

AF:

0.00334

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.000651

Hom.:

Bravo

AF:

0.000574

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Benign:1

Jun 20, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

1.2

Mutation Taster

=100/0

polymorphism

(source)

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

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13-27256416-C-CT

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over