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Differential intolerance to loss of function and missense mutations in genes that encode human matricellular proteins

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Journal of Cell Communication and Signaling Aims and scope

Abstract

Targeted gene disruption in mice has provided valuable insights into the functions of matricellular proteins. Apart from missense and loss of function mutations that have been associated with inherited diseases, however, their functions in humans remain unclear. The availability of deep exome sequencing data from over 140,000 individuals in the Genome Aggregation Database provided an opportunity to examine intolerance to loss of function and missense mutations in human matricellular genes. The probability of loss-of-function intolerance (pLI) differed widely within members of the thrombospondin, CYR61/CTGF/NOV (CCN), tenascin, small integrin-binding ligand N-linked glycoproteins (SIBLING), and secreted protein, acidic and rich in cysteine (SPARC) gene families. Notably, pLI values in humans had limited correlation with viability of the corresponding homozygous null mice. Among the thrombospondins, only THBS1 was highly loss-intolerant (pLI = 1). In contrast, Thbs1 is not essential for viability in mice. Several known thrombospondin-1 receptors were similarly loss-intolerant, although thrombospondin-1 is not the exclusive ligand for some of these receptors. The frequencies of missense mutations in THBS1 and the gene encoding its signaling receptor CD47 indicated conservation of some residues implicated in specific receptor binding. Deficits in missense mutations were also observed for other thrombospondin genes and for SPARC, SPOCK1, SPOCK2, TNR, and DSPP. The intolerance of THBS1 to loss of function in humans and elevated pLI values for THBS2, SPARC, SPOCK1, TNR, and CCN1 support important functions for these matricellular protein genes in humans, some of which may relate to functions in reproduction or responding to environmental stresses.

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Abbreviations

α2δ1:

Precursor of the α2 and δ subunits of voltage-dependent calcium channel, encoded by CACN2D1 

CCN:

Cyr61/CTGF/NOV gene family

CD148:

Membrane-bound tyrosine phosphatase, encoded by PTPRJ

COMP:

Cartilage oligomeric matrix protein

DMP1:

Dentin matrix protein 1

DSPP:

Dentin sialophosphoglycoprotein

ExAC:

Exome Aggregation Consortium

gnomAD:

Genome Aggregation Database

IBSP:

Bone sialoprotein

LoF:

Loss of function

LRP1:

Low density lipoprotein receptor-related protein 1

MEPE:

Matrix extracellular phosphoglycoprotein

pLI:

Probability of loss-of-function intolerance

SIBLING:

Small integrin-binding ligand N-linked glycoproteins

SIRPα:

Signal regulatory protein-α

SMOC:

Secreted modular calcium-binding protein

SNV:

Single nucleotide variation

SPARC:

Secreted protein, acidic and rich in cysteine

SPOCK:

Sparc/osteonectin, CWCV, and kazal-like domains proteoglycan (Testican)

SPP1:

Osteopontin

STIM1:

Stromal interaction molecule 1

THBS:

Thrombospondin

TN:

Tenascin

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Funding

This work was supported by the Intramural Research Program of the NIH/NCI (ZIA SC009172).

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Correspondence to Sukhbir Kaur or David D. Roberts.

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The authors have no relevant financial or non-financial interests to disclose.

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Kaur, S., Roberts, D.D. Differential intolerance to loss of function and missense mutations in genes that encode human matricellular proteins. J. Cell Commun. Signal. 15, 93–105 (2021). https://doi.org/10.1007/s12079-020-00598-9

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  • DOI: https://doi.org/10.1007/s12079-020-00598-9

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